Page 2 of 3 FirstFirst 123 LastLast
Results 101 to 200 of 207
  1. #101
    singletrack bound
    Reputation: Tone No Balone's Avatar
    Join Date
    Dec 2004
    Posts
    2,569
    well I just got back from my first night ride with my MJ-872. I ran the light on my bars and I'm tellin' ya that light is a bright little son of a gun! The flood is so bright smooth and white with no center beam lighting the single track from right to left and from wheel top to horizon up into the approaching trees.

    I say Bright!

    I rode a nice flowy fast single track through tight redwoods and only really used the level 3 (out of 4 levels- 4 being the highest) for most of the descent.Throw was sufficient as this bugger is so bright I never felt I was in danger of out running the light beam.
    I did bump up to level 4 and ran that at high output for a few of those fast miles and the light head seemed to be cool. Took off my gloves to check the light head and it was just slightly warm to the touch. Not all that hot for sure. This light is surely capable of being ran by itself if you can only dish out for one light. I did get the 1 meter cord and helmet mount and will try on my helmet next ride
    .
    The back lit button on the light head with color code power consumption meter is nice on the bars as you can see where you stand as far as battery consumption.
    So far Magicshine product has performed as advertised and completely satisfied with the product.
    I will continue to experiment with the 872 and if I remain satisfied, I may spring for the 1000 lumen MJ 808E for the noggin!
    Tone. .

  2. #102
    mtbr member
    Reputation:
    Join Date
    Jul 2007
    Posts
    8
    I bought an MJ-872 for my wife for her birthday, and she's pretty excited about having her own bright light for MTB night rides. Even though I read this thread before making the purchase, I have to say I was pretty disappointed with the lack of quality. When I disassembled it, there was a ton of metal swarf floating around in the housing (enough to cause a high probability of a short) and the o-ring on the rear cap has a long slit in it as if cut by a razor blade.

    More troubling than that, though, three of the four LEDs light up (albeit very dimly) when the battery is plugged in but the light is off. Has anyone here seen this problem? Assuming it's a problem with this light, I'm not looking forward to the exchange process...

  3. #103
    mtbr member
    Reputation: Cat-man-do's Avatar
    Join Date
    May 2004
    Posts
    5,322
    Quote Originally Posted by Kibo View Post
    I bought an MJ-872 for my wife for her birthday, and she's pretty excited about having her own bright light for MTB night rides. Even though I read this thread before making the purchase, I have to say I was pretty disappointed with the lack of quality. When I disassembled it, there was a ton of metal swarf floating around in the housing (enough to cause a high probability of a short) and the o-ring on the rear cap has a long slit in it as if cut by a razor blade.

    More troubling than that, though, three of the four LEDs light up (albeit very dimly) when the battery is plugged in but the light is off. Has anyone here seen this problem? Assuming it's a problem with this light, I'm not looking forward to the exchange process...
    Hopefully you bought from a reputable dealer because to me it certainly sounds like something is shorted.

  4. #104
    mtbr member
    Reputation: Batas's Avatar
    Join Date
    Jan 2004
    Posts
    917
    Last night ride my mj-872 temperature protection kicked in all the time. I was riding at low speed in 3rd power mode (almost full brightness)...

    I think that the dissipators are not well design for this ligth...

    Is there sufficient thermal paste between the led star and the body?

    Any thoughts?
    Last edited by Batas; 10-16-2011 at 09:34 AM.

  5. #105
    mtbr member
    Reputation:
    Join Date
    Apr 2006
    Posts
    131
    Quote Originally Posted by Batas View Post
    Last night ride my mj-872 temperature protection kicked in all the time. I was riding at low speed in 3rd power mode (almost full brightness)...

    I think that the dissipators are not well design for this ligth...

    Is there sufficient thermal paste between the led star and the body?

    Any thoughts?
    need more info. How slow is slow? Ambient temp?

  6. #106
    mtbr member
    Reputation: Batas's Avatar
    Join Date
    Jan 2004
    Posts
    917
    Speed: 10-15km/h
    Temp. 15-20ºC

  7. #107
    mtbr member
    Reputation: Cat-man-do's Avatar
    Join Date
    May 2004
    Posts
    5,322
    Quote Originally Posted by Batas View Post
    Speed: 10-15km/h
    Temp. 15-20ºC
    10 km/h is pretty slow but with all things considered if your light is powering down due to thermal issues at those temps/speed I would consider that a big problem.

  8. #108
    mtbr member
    Reputation:
    Join Date
    Apr 2006
    Posts
    131
    Quote Originally Posted by Cat-man-do View Post
    10 km/h is pretty slow but with all things considered if your light is powering down due to thermal issues at those temps/speed I would consider that a big problem.
    Agree. 10mph is slow and 60deg f ambient I would not expect the light to be shutting down. I would not be too happy

  9. #109
    mtbr member
    Reputation: XCFred's Avatar
    Join Date
    Sep 2005
    Posts
    318
    I just took delivery of my new 872 last night and was playing around with it a little bit.
    WOW. It totally BLOWS AWAY my Light and Motion Arc, even on the 3rd lowest setting - beam quality, color temperature, and overall brightness. In every way vastly superior.

    However, I did notice a couple times, even on the 75% setting, when holding it in my hand, it powered down to the lowest setting on its own. This has me a bit concerned that it will do it while riding up a hill or something....I will update after my first full ride with it. It definitely gets warm....
    Trek/Gary Fisher Superfly
    Giant Anthem
    Trek Fuel Ex 8
    Lemond Buenos Aires
    Cervelo R3
    www.fasterthansome.blogspot.com

  10. #110
    mtbr member
    Reputation: Batas's Avatar
    Join Date
    Jan 2004
    Posts
    917
    It seems that it is the "normal" behaviour of the mj-872. It gets very hot and the thermal protection kicks in. No good.

    I also have the MJ-808, and it gets hot, but at the same speed, it cools better.

    Since the 872 has two dissipators that can be taken apart from the main unit, I wonder if it is possible to replace the middle with a bigger one. I don't really care if it spoils the aestethic, as long it works...

    Next step is to apply thermal past in everyplace.

  11. #111
    Village Dirtbag
    Reputation: @dam's Avatar
    Join Date
    Jan 2004
    Posts
    2,276
    Crap...I was just about to pull the trigger on one of these. I thought it looked small and had shallow cooling fins for being so powerful? What's the next best option? Dionette XML-3 perhaps?

    I wonder how hard it would be to modify it with a muffin fan.

  12. #112
    mtbr member
    Reputation: Rakuman's Avatar
    Join Date
    Oct 2004
    Posts
    838
    Quote Originally Posted by Batas View Post
    It seems that it is the "normal" behaviour of the mj-872. It gets very hot and the thermal protection kicks in. No good.

    I also have the MJ-808, and it gets hot, but at the same speed, it cools better.

    Since the 872 has two dissipators that can be taken apart from the main unit, I wonder if it is possible to replace the middle with a bigger one. I don't really care if it spoils the aestethic, as long it works...

    Next step is to apply thermal past in everyplace.

    I think you got a bad unit Mine has yet to kick in but I ride at 50% below 10 then kick it up when I'm going faster and that's with a ambient temp of 80 degrees F, Get a replacement from whoever you got it from.
    I always type in bold cuz I'm blind as a bat
    For the Rich there is therapy!!!! for the rest of us we have Mountain Biking


  13. #113
    Village Dirtbag
    Reputation: @dam's Avatar
    Join Date
    Jan 2004
    Posts
    2,276
    Rakuman: I'm curious on whether it'll overheat if you run it on max or one step below max at slower speeds. Some of my night riding areas are rolling trails, where you go fast for a minute, then slow, then fast, and I don't want to have to be constantly adjusting brightness.

  14. #114
    mtbr member
    Reputation: Rakuman's Avatar
    Join Date
    Oct 2004
    Posts
    838
    Quote Originally Posted by @dam View Post
    Rakuman: I'm curious on whether it'll overheat if you run it on max or one step below max at slower speeds. Some of my night riding areas are rolling trails, where you go fast for a minute, then slow, then fast, and I don't want to have to be constantly adjusting brightness.
    I run at 50% or 75%setting 90% of most of my rides this light is so bright any more is just not necessary unless you are hauling @ss sure I kick it up to high for downhills.and if you are booking you get plenty of air flow, I kick it down to low for the marathon climbs and its plenty of light... Love this light.
    I always type in bold cuz I'm blind as a bat
    For the Rich there is therapy!!!! for the rest of us we have Mountain Biking


  15. #115
    mtbr member
    Reputation: mattthemuppet's Avatar
    Join Date
    Jul 2004
    Posts
    2,342
    If returning it isn't an option, it might be worth opening it up, taking the middle finned piece off and slathering some thermal paste (you can get it at computer stores) underneath so that the finned piece makes better contact with the body. As long as the thermal paths (from LED to housing, housing to fins, fins to air) are good, even a bit of airflow should keep the light cool.

    how hot does it get to touch when the thermal protection trips? If it's uncomfortable to hold then the housing is doing its job and you just need to ride faster/ set the light lower. If it's only warm or even cool, especially that centre part, then it's not making good contact and you need to do what I suggested ^.

  16. #116
    mtbr member
    Reputation: XCFred's Avatar
    Join Date
    Sep 2005
    Posts
    318
    It is a great light, absolutely unbeatable at the price.

    I will report back on the dimming issue after my first 'real' ride. On it's maiden voyage on a quick 3 mile ride around the lake near my house, on 75% it did not dim once, but then again, that was on the road going about 18 mph...
    Trek/Gary Fisher Superfly
    Giant Anthem
    Trek Fuel Ex 8
    Lemond Buenos Aires
    Cervelo R3
    www.fasterthansome.blogspot.com

  17. #117
    mtbr member
    Reputation: Batas's Avatar
    Join Date
    Jan 2004
    Posts
    917
    Tonight I will perform a test. Will open the front cover, take the lense out and try to measure the temperature in the star and in the dissipator. Lets see...

    It gets very warm as it is...

  18. #118
    mtbr member
    Reputation: Cat-man-do's Avatar
    Join Date
    May 2004
    Posts
    5,322
    Quote Originally Posted by XCFred View Post
    ...However, I did notice a couple times, even on the 75% setting, when holding it in my hand, it powered down to the lowest setting on its own. This has me a bit concerned that it will do it while riding up a hill or something....I will update after my first full ride with it. It definitely gets warm....
    Yes but you were not using it with air blowing/ moving over it. Try it on the bike and see what happens. Slow climbs should be limited to half or 3/4 power. High should work fine as long as the bike is moving at a decent speed. Ambient air temp sounds like it might be an issue though. There have already been reports of problems at higher temperatures. Not good if you live in an area where it is warm even at night.

    Now if I start hearing of people having the light power down on a down-hill run than that would be a very, very big problem.
    Last edited by Cat-man-do; 10-18-2011 at 01:43 AM.

  19. #119
    mtbr member
    Reputation: XCFred's Avatar
    Join Date
    Sep 2005
    Posts
    318
    FWIW, I was testing it on a chilly 55 degree, very windy night.
    Trek/Gary Fisher Superfly
    Giant Anthem
    Trek Fuel Ex 8
    Lemond Buenos Aires
    Cervelo R3
    www.fasterthansome.blogspot.com

  20. #120
    mtbr member
    Reputation:
    Join Date
    Feb 2010
    Posts
    50
    Just had my first trail ride with an 872 on the bars and 808e on the lid. I ran them both on high for about an hour straight. Neither one dimmed down. I checked them both a couple of times and they were only slightly warm. Ambient temp was about 55 degrees, average speed was about 7mph.

    When I tested the 872 in the house sitting on my desk it would get hot and dim down within about 10 minutes. The 808 would take a little longer to get hot.

  21. #121
    mtbr member
    Reputation:
    Join Date
    Apr 2011
    Posts
    1
    I just got my MJ-872 and the only thing I am unsure of is the way it is mounted to the handle bars. We ride at night in an area that is very XC with lots of 1-2ft drops and tons of rocks/tree roots. I don't want the light to be moving. How secure is the O-Ring mounts? What are my options for something more secure?

  22. #122
    recovering roadie
    Reputation: dobbs's Avatar
    Join Date
    Jan 2004
    Posts
    565
    Alright dudes, partially out of curiosity I bought an MJ-856 lighthead to go with my MJ-872. After receiving it yesterday and playing with it last night, I have dubbed it "the one light to rule them all." It dissipates heat better, has a slightly warmer color temperature, and appears to me to put out about 30% more light than the MJ-872. Stunning. Will try to do a night ride this week with both of them and will comment more if anything is notable.

    I bought it from these guys:

    MagicShine MJ-856b O-ring mount 1600 lumens LED Bike Light Set

    Their customer service was great.

  23. #123
    mtbr member
    Reputation:
    Join Date
    May 2005
    Posts
    2,169
    Quote Originally Posted by dobbs View Post
    Alright dudes, partially out of curiosity I bought an MJ-856 lighthead to go with my MJ-872. After receiving it yesterday and playing with it last night, I have dubbed it "the one light to rule them all." It dissipates heat better, has a slightly warmer color temperature, and appears to me to put out about 30% more light than the MJ-872. Stunning. Will try to do a night ride this week with both of them and will comment more if anything is notable.

    I bought it from these guys:

    MagicShine MJ-856b O-ring mount 1600 lumens LED Bike Light Set

    Their customer service was great.
    Interesting observations! I also bought the 856 and have suggested it a few of my posts. Good to see someone else finally try it out. So far I'm very happy with the light also but I bought the bracket mount vs the o-ring mount. I did a few little mods to it and love how it places the light right over the stem. I have some pics to post at some time.

    It would be great if this light was also included in the light shootout so Fancis could test it with his heat gun vs. the 872.

    Yes, their customer service was awesome I agree.
    2013 Banshee Spitfire V2 650b

  24. #124
    mtbr member
    Reputation:
    Join Date
    Apr 2006
    Posts
    131
    Quote Originally Posted by dobbs View Post
    Alright dudes, partially out of curiosity I bought an MJ-856 lighthead to go with my MJ-872. After receiving it yesterday and playing with it last night, I have dubbed it "the one light to rule them all." It dissipates heat better, has a slightly warmer color temperature, and appears to me to put out about 30% more light than the MJ-872. Stunning. Will try to do a night ride this week with both of them and will comment more if anything is notable.

    I bought it from these guys:

    MagicShine MJ-856b O-ring mount 1600 lumens LED Bike Light Set

    Their customer service was great.
    Damn. You cannot be serious. 30% more light out of the 856.

    Time to go support *someone's* economy......

  25. #125
    mtbr member
    Reputation: Batas's Avatar
    Join Date
    Jan 2004
    Posts
    917
    30% more? Can´t be... How is it possible? Lets see if I can find the head unit only...

  26. #126
    recovering roadie
    Reputation: dobbs's Avatar
    Join Date
    Jan 2004
    Posts
    565
    Quote Originally Posted by Batas View Post
    30% more? Can´t be... How is it possible? Lets see if I can find the head unit only...
    I have no explanation - surprised the heck out of me. Maybe my MJ-872 is a dud? I love the 872, though, so I think I will love the 856 even more. And the 872 became the secondary light.

  27. #127
    Village Dirtbag
    Reputation: @dam's Avatar
    Join Date
    Jan 2004
    Posts
    2,276
    The 856 is the silver housing one, right? Isn't the optic, reflector, and LED's the same as the 872?

    Would you take some pics? Better yet, would you put both of them on your bike, ride slow (or not at all) and tell us if one overheats first (does the 856 gave the overheat step-down mode)?

  28. #128
    mountain biker
    Reputation: slyfink's Avatar
    Join Date
    Apr 2004
    Posts
    529
    Quote Originally Posted by scar View Post
    For those of you who have gotten the replacement batteries - The LED indicator might turn RED sooner than expected even though you have a fully charged pack.

    Here is the official explanation from Geomangear:

    "We understand you are seeing some variations in the color indicator. We have referred this issue to our battery manufacturer and they have examined the discharge rates of the Panasonic cells we use and the other cells that Magicshine has used in a number of battery packs. The cells from different manufacturers discharge at different rates and the voltage meter in the lighthead was designed to compliment the chinese cells rather than the Panasonic cells we use. The burntime will be the same as listed however the color indicators will change faster with the Panasonic cells. We have posted color change estimates on our website that you might see with the GeoManGear battery packs.

    Our battery pack manufacturer is looking at solutions to this issue however we will only use the Panasonic cells and we don't manufacture the lightheads so it will be a difficult issue to overcome.

    We are not seeing any diminished runtime, only lighthead indicator colors are showing change earlier than the original Chinese battery packs as discussed above.

    Thanks
    GeoManGear"



    ***
    Hey guys,

    How long does it take to charge the 6v battery packs? I just got my 872 new this weekend, and I charged it once for approx. 2 hours, and a second time for approx. 2 also. The indicator light on the charger is green, but when I plug the battery to the lighthead, the indicator light is yellow.

    On the one hand I don't want to leave the battery plugged in too long, but on the other hand I don't want to run out of light on the trail

    I couldn't find info on GeoManGears website about how long to charge the batteries, and what the color of the indicator light on the charger represents. Any info would be appreciated.
    continuous growth is the strategy of a cancer cell.

  29. #129
    mtbr member
    Reputation: Batas's Avatar
    Join Date
    Jan 2004
    Posts
    917
    Quote Originally Posted by @dam View Post
    The 856 is the silver housing one, right? Isn't the optic, reflector, and LED's the same as the 872?

    Would you take some pics? Better yet, would you put both of them on your bike, ride slow (or not at all) and tell us if one overheats first (does the 856 gave the overheat step-down mode)?

  30. #130
    mtbr member
    Reputation:
    Join Date
    Nov 2008
    Posts
    33
    Quote Originally Posted by skidad View Post
    Interesting observations! I also bought the 856 and have suggested it a few of my posts. Good to see someone else finally try it out. So far I'm very happy with the light also but I bought the bracket mount vs the o-ring mount. I did a few little mods to it and love how it places the light right over the stem. I have some pics to post at some time.

    It would be great if this light was also included in the light shootout so Fancis could test it with his heat gun vs. the 872.

    Yes, their customer service was awesome I agree.
    Where did you got the bracket mount?

  31. #131
    mtbr member
    Reputation:
    Join Date
    Oct 2006
    Posts
    2,787
    Quote Originally Posted by slyfink View Post
    ...I couldn't find info on GeoManGears website about how long to charge the batteries, and what the color of the indicator light on the charger represents...
    The battery normally takes about 4 hrs for a full charge. A red indicator = charging. A green indicator = charging complete.

    My MJ-872's indicator light, with a Geomangear battery and run on high, usually changes from green to blue to orange in less then a minute. Total run time is not effected.

  32. #132
    mountain biker
    Reputation: slyfink's Avatar
    Join Date
    Apr 2004
    Posts
    529
    Quote Originally Posted by gmcttr View Post
    The battery normally takes about 4 hrs for a full charge. A red indicator = charging. A green indicator = charging complete.

    My MJ-872's indicator light, with a Geomangear battery and run on high, usually changes from green to blue to orange in less then a minute. Total run time is not effected.
    cool, thanks. I guess I'll find out for sure tomorrow!
    continuous growth is the strategy of a cancer cell.

  33. #133
    mtbr member
    Reputation: William_Cannon's Avatar
    Join Date
    May 2009
    Posts
    286
    Quote Originally Posted by mochodurazo View Post
    Where did you got the bracket mount?
    I'm curious as well

  34. #134
    Slovakia (Europe)
    Reputation: PeterG's Avatar
    Join Date
    Mar 2004
    Posts
    619
    Quote Originally Posted by dobbs View Post
    I have no explanation - surprised the heck out of me. Maybe my MJ-872 is a dud? I love the 872, though, so I think I will love the 856 even more. And the 872 became the secondary light.
    Is the MJ-872 with clear or frosted optic? If it's frosted optic, it makes sense...
    I'm also looking for MJ-856b (O-ring mount), but can't find any in EU except of Finland.

  35. #135
    recovering roadie
    Reputation: dobbs's Avatar
    Join Date
    Jan 2004
    Posts
    565
    Quote Originally Posted by PeterG View Post
    Is the MJ-872 with clear or frosted optic? If it's frosted optic, it makes sense...
    I'm also looking for MJ-856b (O-ring mount), but can't find any in EU except of Finland.
    Both have the clear lens, and are supposed to be exactly the same internally.

    When I next ride, I will test them on a climb to see which one overheats first. I live in Phoenix, Arizona and our daytime high temps are still in the 90s F. Heat is the main problem with these lights around here. And the friggin scorpions and camel spiders. Ack.

  36. #136
    mtbr member
    Reputation:
    Join Date
    May 2005
    Posts
    2,169
    Quote Originally Posted by mochodurazo View Post
    Where did you got the bracket mount?
    BrightStone Sports. You can get the MJ-856 with either the bracket mount (now showing out of stock) or the typical o-ring mount. They are listed seperately.

    MagicShine MJ-856 1600 lumens LED Bike Light Set

    I also upgraded the standard battery to the new Samsung 5600mAh battery pack (also showing out of stock)

    MagicShine Samsung 5600 mAh Battery Pack
    2013 Banshee Spitfire V2 650b

  37. #137
    Village Dirtbag
    Reputation: @dam's Avatar
    Join Date
    Jan 2004
    Posts
    2,276
    Thanks, dobbs. When will you ride next- I'm getting an itchy trigger finger and want to know if I should get one of thoes, or splurge for a Dionette XML-3

    Are you sure it's brighter? Do you have a camera with manual exposure controls? I'd love to see the difference. The only thing I could think of that might make them different is quality control, overheating LEDs, or perhaps the battery.

    Skidad: have you seen how much run time you get out of that pack?

    About my only concern with the 856 is the sharp edges...it might be bad in a crash. It seems like it would cool better while moving, but maybe not as well while stopped.

  38. #138
    mtbr member
    Reputation: MRMOLE's Avatar
    Join Date
    May 2011
    Posts
    1,281
    Quote Originally Posted by dobbs View Post
    Alright dudes, partially out of curiosity I bought an MJ-856 lighthead to go with my MJ-872. After receiving it yesterday and playing with it last night, I have dubbed it "the one light to rule them all." It dissipates heat better, has a slightly warmer color temperature, and appears to me to put out about 30% more light than the MJ-872. Stunning. Will try to do a night ride this week with both of them and will comment more if anything is notable.

    I bought it from these guys:

    MagicShine MJ-856b O-ring mount 1600 lumens LED Bike Light Set

    Their customer service was great.
    I'm looking foreward to your next post. My first question is did you buy just the light head (I didn't see that option on the brightstone website) or a whole new set? I also would like your opinion (or anyone elso who owns an 856 or 872) of the trailshot in this years light comparison. I was a little disapointed in the throw and I also noticed that the lumin output of the 872 was consideratly lower than last years Light-N-Go Foride (MS 856). I know it's a flood but it looks weaker that other beamshots I've seen of this light. Please let me know what you thing.

  39. #139
    Slovakia (Europe)
    Reputation: PeterG's Avatar
    Join Date
    Mar 2004
    Posts
    619
    Quote Originally Posted by @dam View Post
    ...
    Are you sure it's brighter? Do you have a camera with manual exposure controls? I'd love to see the difference. The only thing I could think of that might make them different is quality control, overheating LEDs, or perhaps the battery.
    ...
    LED binning may be different as well, R5 instead of R4

  40. #140
    RTM
    RTM is online now
    #1 Latex Salesman
    Reputation: RTM's Avatar
    Join Date
    Sep 2005
    Posts
    1,845
    Quote Originally Posted by @dam View Post
    Thanks, dobbs. When will you ride next- I'm getting an itchy trigger finger and want to know if I should get one of thoes, or splurge for a Dionette XML-3
    I'd go with the XML-3. In fact I just did. Great light, GREAT company. there was just too much doubt swirling around here for me to buy a MS with confidence.
    Last edited by RTM; 10-19-2011 at 09:54 AM.

  41. #141
    mtbr member
    Reputation: XCFred's Avatar
    Join Date
    Sep 2005
    Posts
    318
    For what its worth, I did a 20 mile road ride tonight with the 872, with it on high 90% of the time, and it didn't power down once. Worked great. Plenty of light, at a really neutral color. I love the led indicator that makes it plain as day how much battery life you have left, the simple mounting, the diminutive battery, and the great even flood beam pattern. So far I gotta say this is an unbelievable light for the money.
    Trek/Gary Fisher Superfly
    Giant Anthem
    Trek Fuel Ex 8
    Lemond Buenos Aires
    Cervelo R3
    www.fasterthansome.blogspot.com

  42. #142
    mtbr member
    Reputation:
    Join Date
    Nov 2010
    Posts
    14
    Quote Originally Posted by jlwardn View Post
    I just got my MJ-872 and the only thing I am unsure of is the way it is mounted to the handle bars. We ride at night in an area that is very XC with lots of 1-2ft drops and tons of rocks/tree roots. I don't want the light to be moving. How secure is the O-Ring mounts? What are my options for something more secure?
    I had problems with my Magicshine moving around so I got some adhesive backed "traction" tape from the local hardware store, cut a short strip (about enough to wrap half way around the handlebar), peeled off the backing and stuck it to the top half of bar in the position I normally mount the light.

    Once the light is positioned on this traction tape and secured with the O-ring there is NO unwanted movement. If you need to adjust the position of the light on the bar rotate it forward or back by pulling up a bit against the resistance of the O-ring.

    The traction tape is inexpensive. It's black and has a really rough sandpaper like finish. A 1" wide roll by about 3 ft cost about $4 and should be enough to do dozens of bars or last a lifetime. You can also use it on your wooden deck steps or other areas of the house!

  43. #143
    singletrack bound
    Reputation: Tone No Balone's Avatar
    Join Date
    Dec 2004
    Posts
    2,569
    Quote Originally Posted by XCFred View Post
    For what its worth, I did a 20 mile road ride tonight with the 872, with it on high 90% of the time, and it didn't power down once. Worked great. Plenty of light, at a really neutral color. I love the led indicator that makes it plain as day how much battery life you have left, the simple mounting, the diminutive battery, and the great even flood beam pattern. So far I gotta say this is an unbelievable light for the money.
    same here....just got back from approx 2 hrs of run time on high 90% of time and the 872 functioned flawlessly. After trying bar mount and helmet mount, I must say this light works best on the bar. The non spot/flood lights the trail left to right evenly really well and just above my front tire up into the trees out front. Again I took off the gloves and touched the light housing during high output and the housing was slightly warm to the touch. Certainly not really hot for sure. I swear you can get away with running this on your bars as a single light source if you had to. I am going to do this for a few more weeks to see how it goes.
    If it runs problem free I may look into the 1000 lumen MJ-808E for the helmet.
    Tone~

  44. #144
    mtbr member
    Reputation:
    Join Date
    May 2005
    Posts
    2,169
    Quote Originally Posted by @dam View Post
    Skidad: have you seen how much run time you get out of that pack?

    About my only concern with the 856 is the sharp edges...it might be bad in a crash. It seems like it would cool better while moving, but maybe not as well while stopped.
    Not sure on the total run time yet. Did a 2 hour ride last night and only had the light on setting 2 and the button light stayed green the majority of the ride. Turned blue towards the end. Next 2 hour ride I'll bump it to level 3. Level 4 is spoiling yourself for the most part with just a huge flood of light. I may run a test in the house with the light on full power with a fan cooling the light head. Very happy so far with this light and not really concerned about the edges in a crash.

    I debated between this light and the DiNotte 1200L Plus which is a super nice light (and DiNotte is within easy driving distance). Tough decision but since this was my first light purchase and also buying a helmet light (the new Gemini Xera light) I went the bargain route not knowing if this night thing was for me (it is and super fun). So far I love both lights but time will tell on reliability. Customer service from BrightStone(MS) and Gemini(Xera) has been great.
    2013 Banshee Spitfire V2 650b

  45. #145
    mtbr member
    Reputation:
    Join Date
    Mar 2004
    Posts
    76

    Recommended?

    So what it the verdict - is the MJ-872 a light that you guys would recommend?

    Thanks

    Juergenor

  46. #146
    mtbr member
    Reputation: Rakuman's Avatar
    Join Date
    Oct 2004
    Posts
    838
    Quote Originally Posted by juergenor View Post
    So what it the verdict - is the MJ-872 a light that you guys would recommend?

    Thanks

    Juergenor
    Best affordable bang for your buck I love mine
    I always type in bold cuz I'm blind as a bat
    For the Rich there is therapy!!!! for the rest of us we have Mountain Biking


  47. #147
    The Dog.
    Reputation: Dogdude222's Avatar
    Join Date
    Aug 2005
    Posts
    961
    One more data point, your mileage may vary:

    Recently received an 872 from geoman. Light appears very well made...really nice. Took it out to the dark forest behind my place and compared it to my HID niterider from several years ago. This is a very, very bright light. Even though it throws a very even flood, it throws way farther than my HID spot, even at 75%. The quality of the light is excellent too. It is warm and even...much more yellow than my HID.

    Unfortunately, it also exhibited some of the same behaviors others have seen. With the panasonic 6Ah geoman battery it quickly indicated blue, despite clearly having a full charge left.

    The main problem, though, was heat. I noticed immediately that the light was kicking down to 75% quite quickly. So, I set up a test: I figure the light should work in 65 degrees with a fan blowing on it (greater apparent wind that on a typical MTB ride). I put the standing fan on low approximately 10 feet in front of the handlebars. The light kicked down to 75% in less than 5 minutes. It is not a noticeable kickdown, it just dims gradually so that you don't notice unless you move it up to high again.

    I was bummed. Even though I mainly use lights in the cool fall nights and in the very cold winter months, sometimes I ride at night in the summer to avoid the heat of the day. I know that this light would have issues. I'll be sending the 872 back to give the 856 a shot. I figure a light with at least 2x greater surface area should be better with heat control.

  48. #148
    mtbr member
    Reputation: XCFred's Avatar
    Join Date
    Sep 2005
    Posts
    318
    Yeah that's what I noticed, too, when I was first using it. When it does dim down, it does so so gradually it is impossible to notice. I actually stared for a minute or two trying to notice it dim, and couldn't, but then if I clicked the up arrow, it got noticably brighter, despite already having been on the brightest setting. Kinda weird.
    Trek/Gary Fisher Superfly
    Giant Anthem
    Trek Fuel Ex 8
    Lemond Buenos Aires
    Cervelo R3
    www.fasterthansome.blogspot.com

  49. #149
    mtbr member
    Reputation:
    Join Date
    Jul 2009
    Posts
    44
    In my analysis done [here] I concluded that the MJ-872 was the best value on paper. It's threads like this I really appreciate. I'm hesitant to go with this light as I don't want to gamble ~$200. I'll take a look at the MJ-856 since I read it's the same light with a different housing.

  50. #150
    mtbr member
    Reputation: Batas's Avatar
    Join Date
    Jan 2004
    Posts
    917
    Last nights ride my MJ-872 performed ok.

    12-14ºC air temperature, 75%-50% mode uphill, full power downhill, no dimming. I guess its going to be ok.

    Can´t say that for my carbon brake lever though. My ribs hurt today.


  51. #151
    The Dog.
    Reputation: Dogdude222's Avatar
    Join Date
    Aug 2005
    Posts
    961
    Quote Originally Posted by batas View Post
    last nights ride my mj-872 performed ok.

    12-14ºc air temperature, 75%-50% mode uphill, full power downhill, no dimming. I guess its going to be ok.

    Can´t say that for my carbon brake lever though. My ribs hurt today.

    ouch.

  52. #152
    mtbr member
    Reputation: TwoHeadsBrewing's Avatar
    Join Date
    Aug 2009
    Posts
    2,879
    So is the temperature really an unsolvable problem, or is it due to insufficient thermal paste? I'm looking for a better bar light and the light output looks good but I'd rather not be stuck running at 75% all the time.
    "Got everything you need?"

  53. #153
    mtbr member
    Reputation:
    Join Date
    Apr 2006
    Posts
    2,726
    I honestly planned from the get-go to run at the second highest power setting, but the times I've run at full power I really didn't think I was missing much at second-highest.

  54. #154
    mtbr member
    Reputation:
    Join Date
    Jul 2009
    Posts
    44
    The MJ-856 looks to be the same light just with a different, potentially better, housing. Anyone test this against the MJ-872?
    If anyone has or knows of a 15.5" blue 2009 Gary Fisher Mamba for sale, please let me know.

  55. #155
    mtbr member
    Reputation: TwoHeadsBrewing's Avatar
    Join Date
    Aug 2009
    Posts
    2,879
    Quote Originally Posted by PiranhaFisher View Post
    The MJ-856 looks to be the same light just with a different, potentially better, housing. Anyone test this against the MJ-872?
    It looks like a good light, but I'm leery about buying a new model from a vendor that I've never heard of. At least with Geomangear you know they'll stand behind the product.
    "Got everything you need?"

  56. #156
    The Dog.
    Reputation: Dogdude222's Avatar
    Join Date
    Aug 2005
    Posts
    961
    Quote Originally Posted by PiranhaFisher View Post
    The MJ-856 looks to be the same light just with a different, potentially better, housing. Anyone test this against the MJ-872?
    In a day or two, I'll be able to provide that perspective. Unfortunately, I won't have both lights in hand at once. I suppose I could delay returning the 872, but that would be a pain in the arse.

  57. #157
    mtbr member
    Reputation:
    Join Date
    Jul 2009
    Posts
    171
    Hm, I cannot access the Light and Go website in the last couple of days by some reason. Anyway, I run an older MJ-808 and MJ-870 combo (my setup: helmet/handlebar) on mountain bike trails, my setup performs very well. My MJ-870 has 'only' 3 XP-Gs and equipped with the old lens, not the new clear one. I used my 870 between 5-15 degrees Celsius (41-59 degrees Fahrenheit), didn't have any heating issues, in spite of the old lens. The beam is quite similar to the MJ-872, but provides a bit less light. The battery lasts about 3 hours at 100% mode, which is far enough for me.
    I'm thinking about purchasing an another MJ light as well. Based on your opinions, maybe the MJ-856B would be the best but I cannot order it, brightstonesports.com doesn't ship to my country and it seems the L & Go website is down... Nevertheless, the updated MJ-872 with the new clear lens would be also perfect for me. Do you know guys something about that DealExtreme ships the MJ-872 with the new lens? (Opinions are divided on some forums...)

  58. #158
    mtbr member
    Reputation: XCFred's Avatar
    Join Date
    Sep 2005
    Posts
    318
    I bought mine from bikeempowerment.com for $144 shipped. It shipped USPS from CA to the Boston area, and I had it in only two days. Couldn't be happier with the transaction.
    Trek/Gary Fisher Superfly
    Giant Anthem
    Trek Fuel Ex 8
    Lemond Buenos Aires
    Cervelo R3
    www.fasterthansome.blogspot.com

  59. #159
    mtbr member
    Reputation: William_Cannon's Avatar
    Join Date
    May 2009
    Posts
    286
    Just got my 872 and ran it for about 30 min on full power with out any issues. Average speed 10mph, average temp 70F. So far so good and extremely happy.

  60. #160
    Slovakia (Europe)
    Reputation: PeterG's Avatar
    Join Date
    Mar 2004
    Posts
    619
    Quote Originally Posted by semmiho View Post
    ... Based on your opinions, maybe the MJ-856B would be the best but I cannot order it, brightstonesports.com doesn't ship to my country and it seems the L & Go website is down...
    I guess you are from Hungary, so you can order here Magicshine MJ-856B*valaisinsarja (tilaus) « Otsa- ja polkupyörävalaisimet « VALAISIMESI.FI for ca. 150.00 EUR shipped (ask at asiakaspalvelu@valaisimesi.fi or customerservice@valaisimesi.fi for the shipping cost to your country) .

  61. #161
    recovering roadie
    Reputation: dobbs's Avatar
    Join Date
    Jan 2004
    Posts
    565
    I rode with both the 872 and 856 last night. That is a ridiculous amount of light. I cleaned one climb I've only gotten clean at night once before and I cleaned another climb that I've never been able to on previous night rides (but have during the day).

    The temperature was 76 F, and I had no power downs due to heat, even on the climb. I tried running them both at max power on the climb, but it's just too bright, so I ran them both at 70%. I do think that the 856 is brighter than the 872, but the beam is also a little more concentrated, which I don't prefer. Between the two I would definitely buy the 856. It was much cooler to the touch, so I think its heat sink fins work better.

    I will try to do some comparison photos soon.

  62. #162
    mtbr member
    Reputation: Batas's Avatar
    Join Date
    Jan 2004
    Posts
    917
    Did you run them both on the handlebar? Don't forget to put the camera in manual mode

  63. #163
    mtbr member
    Reputation: William_Cannon's Avatar
    Join Date
    May 2009
    Posts
    286
    Quote Originally Posted by William_Cannon View Post
    Just got my 872 and ran it for about 30 min on full power with out any issues. Average speed 10mph, average temp 70F. So far so good and extremely happy.
    Update:
    2nd ride: Temp = 70F to 75F. Average speed = much slower than my first ride.

    The 872 did power down from high 3 or 4 times I believe. I noticed a change in light, but being new to night riding I was really concerned with a lot of other things. I know for sure of one power-down on a fast stretch and one on a technical section. For as slow as we were going, I was expecting more power-downs based on the commentary on this board. I'm still really happy with the light - great bang for the buck. As long as I don't have any power-downs from medium-high to medium, I'll continue to be happy. I never felt the need to run it on high. High power gave me a bit more depth perception and more clarity with my surroundings. I can see it's application most useful on technical downhills and areas with overgrown/under-groomed flora.

    I will say that when comparing/complementing the 808E, I was expecting the 872 to be brighter. The 808E has an amazing spot and a decent halo. My initial impression is that the 808E washes out a lot of the 872's light. On my next ride, I'll need to stop and play with the different power settings to validate my claim above.

    In all, the 872 and 808E combo is great.

  64. #164
    singletrack bound
    Reputation: Tone No Balone's Avatar
    Join Date
    Dec 2004
    Posts
    2,569
    In all, the 872 and 808E combo is great.


    I think this is what I will be going with too!
    been riding with the 872 only on the bars and I can ride with just that light....it is that bright, but having the 808E on the helmet will complete my night riding needs I'm pretty sure. Having the bar and helmet light will also allow you to extend your ride time by alternating the discharge of either lights on long climbs thus saving discharge time on both lights!

  65. #165
    Village Dirtbag
    Reputation: @dam's Avatar
    Join Date
    Jan 2004
    Posts
    2,276
    Quote Originally Posted by dobbs View Post
    I rode with both the 872 and 856 last night. That is a ridiculous amount of light. I cleaned one climb I've only gotten clean at night once before and I cleaned another climb that I've never been able to on previous night rides (but have during the day).

    The temperature was 76 F, and I had no power downs due to heat, even on the climb. I tried running them both at max power on the climb, but it's just too bright, so I ran them both at 70%. I do think that the 856 is brighter than the 872, but the beam is also a little more concentrated, which I don't prefer. Between the two I would definitely buy the 856. It was much cooler to the touch, so I think its heat sink fins work better.

    I will try to do some comparison photos soon.

    Hmmm...maybe a good test would be to turn both of them on inside and see which one steps down first. That'll partially test thermal mass, but also static heat dissipation and possibly how good the thermal path is.

  66. #166
    The Dog.
    Reputation: Dogdude222's Avatar
    Join Date
    Aug 2005
    Posts
    961
    Just got my 856 and still had the 872 kicking around because I missed the post office yesterday. Just out of the box, inside, daylight, I thought the 856 was dimmer. I'm not sure if the LED's had to have an initial burn in or something, but the 856 is definitely brighter than the 872 now. Confirmed by both my roommate and girlfriend who couldn't care less. The beam pattern of the 856 is slightly more focused but still a flood. It is also WAY more even. The 872 has more of a center spot that trails off. Even the center of the 872 is not as bright as anywhere on the pattern of the 856. Lastly, the 856 is a bit whiter. Perhaps this could contribute to an optical illusion that it is brighter.

    Lighting aside, the heat issue:

    The 856 is a bit heftier in the hand and is certainly larger. Just turning it on inside on high, it did heat up quite a bit and kick down. The good news, though, is that it passed my indoor fan test. The 872 kicked down in less than 5 minutes under the fan. The 856 never kicked down under the fan. It was warm, but not overly hot. You could feel that the rear of the lamp was quite a bit cooler than the front, indicating that the cooling fins do indeed work. On 75% under the fan, the 856 was gently warm.

    Brightstone sports was great to work with, quickly responded to emails, and shipped out my light with the 5.6 Ah battery before they were supposed to be back in stock. Gave me the 5% discount too.

    Beam pic with iphone. Both fully charged batteries, despite blue indicator of 872. 872 on left, 856 on right. I think the photo exaggerates the difference a bit.


  67. #167
    Village Dirtbag
    Reputation: @dam's Avatar
    Join Date
    Jan 2004
    Posts
    2,276
    Thanks! Sorry GeoMan- looks like I'm going with the 856.

    Is there a code for the 5% discount?

    How long did the 872 take to kick down without the fan? It seems like the T-shaped fins on the 856 might actually keep the thing warmer unless it has air moving over it.

  68. #168
    mtbr member
    Reputation: GTR2ebike's Avatar
    Join Date
    May 2010
    Posts
    1,872
    Does the 856 have the (clear) 25 degree optic? Edit: It does

    The beam of the 856 seems a little better but honestly after what Geoman has done they have my business for life (when buying magicshines). Even if that light is slightly better I'd rather have the Geoman battery and Geoman customer service for a little more money.
    Last edited by GTR2ebike; 10-22-2011 at 01:03 PM.

  69. #169
    The Dog.
    Reputation: Dogdude222's Avatar
    Join Date
    Aug 2005
    Posts
    961
    More info:

    Just tried both lights at night. Yes the 856 is brighter by a bit. And the pattern is different. The 856 is a bit more even, but the 872 is more soothing for some reason...maybe a bit more yellow. Very similar, in any case.

    The cooling fins DEFINITELY work. The 856 was warm enough to kick down from me standing in a field comparing beams. I rode down the street still on high in 50 degrees, and it was only slightly warm after <30 seconds. A similar first experience with 872 proved that it does not do that.

    Obviously I have not tested battery life, but IMO I like the magicshine 5.6 Ah from brightstone more. First of all, the battery life indicator actually works...not just kicking down to blue and then back up to green all the time. I also like the foam rubber case/strap setup better. Very secure and easier on bike finish.

    Summary: 856 > 872, but only slightly.

  70. #170
    RTM
    RTM is online now
    #1 Latex Salesman
    Reputation: RTM's Avatar
    Join Date
    Sep 2005
    Posts
    1,845
    Quote Originally Posted by Dogdude222 View Post
    and girlfriend who couldn't care less.
    Funny. So baffling that no matter how much we educate they just never understand what's so obviously "cool"


    Sent from my iPad using Tapatalk

  71. #171
    mtbr member
    Reputation: Cat-man-do's Avatar
    Join Date
    May 2004
    Posts
    5,322
    Quote Originally Posted by Dogdude222 View Post

    .....Lighting aside, the heat issue:

    The 856 is a bit heftier in the hand and is certainly larger. Just turning it on inside on high, it did heat up quite a bit and kick down. The good news, though, is that it passed my indoor fan test. The 872 kicked down in less than 5 minutes under the fan. The 856 never kicked down under the fan. It was warm, but not overly hot. You could feel that the rear of the lamp was quite a bit cooler than the front, indicating that the cooling fins do indeed work. On 75% under the fan, the 856 was gently warm.

    Brightstone sports was great to work with, quickly responded to emails, and shipped out my light with the 5.6 Ah battery before they were supposed to be back in stock. Gave me the 5% discount too.

    Beam pic with iphone. Both fully charged batteries, despite blue indicator of 872. 872 on left, 856 on right. I think the photo exaggerates the difference a bit.

    DD, you sold me. Not that I'm going to buy an 856 but if I was in the market and vacillating between the two I would get the 856. These are also using the standard O-ring mounting so that's a big plus over the earlier models. I love Geoman as a web vendor but if the 856 is better I'd rather go with the over-all better light. ( to my eyes it looks like the 872 has a wider beam. Likely the 856 has better throw but a tad less out to the sides. Personally I'd like that better. )

    Now about the battery: I looked at the brightstonesports web site but I don't see any numbers on the listed battery pack. DD, You mentioned it being 5.6mAh but I can't find that listing. ( if you see it on there please point it out, thanks ) Still, I'd buy it regardless. Even if the standard battery was less than the Geoman standard 4.5mAh pack.

  72. #172
    mtbr member
    Reputation:
    Join Date
    Oct 2006
    Posts
    2,787
    Quote Originally Posted by Cat-man-do View Post
    ...You mentioned it being 5.6mAh but I can't find that listing. ( if you see it on there please point it out, thanks )...
    MagicShine Samsung 5600 mAh Battery Pack

  73. #173
    mtbr member
    Reputation:
    Join Date
    May 2005
    Posts
    2,169
    Quote Originally Posted by gmcttr View Post
    On that link above it shows out of stock.....but if you go to their home page it's now listed as back in stock

    BrightStoneSports - MagicShine Bike Light and Accessories | Magic Shine MJ-808 | MJ-808e | MJ-816 | MJ-818 | MJ-856 | MJ-872 | ...

    The 5600mAh Samsung battery upgrade is a no brainer IMO and what I got with my 856. More power, great harness mount and less bulky than that odd LCD battery that comes with some of the MS lights. I'm sure GeoMans battery is great also but he doesn't carry the 856 light and I believe I made the right choice getting the 856 over the 872. Highly recommend BrightStone also.

    Don't be afraid of getting the 856 with the bracket mount that places the light over the center of the stem. It's actually pretty darn nice IMO and I did a few simple mods to it that I think make it a bit more secure. So far it's been great in some very bouncy, rocky terrain and it really doesn't sit up that high. Kind of just high enough to not have to shine through cables. No big drops for me though where perhaps the o-ring mount might be more secure.
    2013 Banshee Spitfire V2 650b

  74. #174
    mtbr member
    Reputation: TwoHeadsBrewing's Avatar
    Join Date
    Aug 2009
    Posts
    2,879
    The guy here at BikeEmpowerment.com makes a nice solid mount for many of the MagicShine models. It's basically a clamp style bar mount that screws into the lighthead base right where the standard O-ring mount goes. You take off the O-ring mount and screw in the new mount. Pretty cool!

    Mount video:


    He also sells a lot of models of the MagicShine, but sadly not the 856. He has also posted up a few other video reviews of the MS lights. The price of his 870 is just $120.

    So for those who have the 870, 872, or 856 do you think it's a good upgrade over the old P7 MJ808? I have two of those right now, but would like a nice floody bar light. The 870 looks great and is just $120 from BikeEmpowerment, while the 856 is $156 from BrightStoneSports. Is it really worth the extra $36 and is the extra brightness that noticable?
    Last edited by TwoHeadsBrewing; 10-23-2011 at 10:14 AM.
    "Got everything you need?"

  75. #175
    mtbr member
    Reputation: TwoHeadsBrewing's Avatar
    Join Date
    Aug 2009
    Posts
    2,879
    Has anyone used thermal paste or aluminum shims to create a more efficient thermal transfer between the internal case and external housing?
    "Got everything you need?"

  76. #176
    mtbr member
    Reputation: Batas's Avatar
    Join Date
    Jan 2004
    Posts
    917
    What do you mean? The outer casing (with the fins) fits very tight on the outside of the body. You can´t put anything in between. I tryed to put thermal past, no good.

  77. #177
    mtbr member
    Reputation: TwoHeadsBrewing's Avatar
    Join Date
    Aug 2009
    Posts
    2,879
    Quote Originally Posted by Batas View Post
    What do you mean? The outer casing (with the fins) fits very tight on the outside of the body. You can´t put anything in between. I tryed to put thermal past, no good.
    I had no idea how tight it was, but thought the heat issue might be due to poor heat transfer. So what was "no good" about the thermal paste? Not enough room, or did it not help, or?
    "Got everything you need?"

  78. #178
    mtbr member
    Reputation:
    Join Date
    Apr 2004
    Posts
    149

    Lighthead weights

    I looked on the review this thread was spawned from and didn't see any weights reported. Just curious if anyone has weights of the various MS model lightheads. I've read on this forum several reports that the 856 is "heftier", just wondering how it compares to 808, 870, 872. All weights I've been able to find online include the battery, so it's tough to compare with different batteries.

    Thanks

  79. #179
    mtbr member
    Reputation: Batas's Avatar
    Join Date
    Jan 2004
    Posts
    917
    Well, both. It is so tight that when you push the outer ring back to place, the thermal paste comes out.

    I reaplied good quality thermal paste between the star and the body. The problem isnt from that. I believe that the body isnt design too dissipate that ammount of heat, or the thermal protection kicks to soon.

  80. #180
    mtbr member
    Reputation: Rakuman's Avatar
    Join Date
    Oct 2004
    Posts
    838
    Quote Originally Posted by icycle View Post
    I looked on the review this thread was spawned from and didn't see any weights reported. Just curious if anyone has weights of the various MS model lightheads. I've read on this forum several reports that the 856 is "heftier", just wondering how it compares to 808, 870, 872. All weights I've been able to find online include the battery, so it's tough to compare with different batteries.

    Thanks
    Seeing I have a scale available I figured I would see what these do weigh, these are with there rubber bands I was not expecting this now if someone will weigh their 856
    MS872

    MS808
    I always type in bold cuz I'm blind as a bat
    For the Rich there is therapy!!!! for the rest of us we have Mountain Biking


  81. #181
    mtbr member
    Reputation:
    Join Date
    Apr 2004
    Posts
    149
    Quote Originally Posted by Rakuman View Post
    Seeing I have a scale available I figured I would see what these do weigh, these are with there rubber bands I was not expecting this now if someone will weigh their 856
    Thanks! It looks like 872 == 101g and 808 == 104g. Since I posted, I found your post from earlier today (Geoman: what's coming soon for Magicshine?) where you said the 856 is 23g heavier than the 872, so that'd put it ~124g. Where'd you get the 23g number from?

  82. #182
    mtbr member
    Reputation: Rakuman's Avatar
    Join Date
    Oct 2004
    Posts
    838
    Quote Originally Posted by icycle View Post
    thanks! It looks like 872 == 101g and 808 == 104g. Since i posted, i found your post from earlier today (Geoman: what's coming soon for Magicshine?) where you said the 856 is 23g heavier than the 872, so that'd put it ~124g. Where'd you get the 23g number from?
    Geoman
    I always type in bold cuz I'm blind as a bat
    For the Rich there is therapy!!!! for the rest of us we have Mountain Biking


  83. #183
    mtbr member
    Reputation:
    Join Date
    Nov 2008
    Posts
    33
    Tested my GEOMANS 2600 combo (872 &808E) yesterday.

    And wow!!!! that was ver impresive. Nice flood on the 872, the throw starts just in front your tire. 808E has a hugh halo and big center spot. I find very useful to have both light, 872 in the bars, and 808E in the helmet.

    I must say, this was my first time using a helmet light, and i was riding like kid with his new toy....

    I alway ride in the lower levels, just for caution, and hit the higher beams for the Donwhills. I also found the 2600 (theorical) lumens, was to much for tight and technical DH.

    Speaking in heat disipation, was riding on 77 F, and both of the lights got little hot. touch them with my forearm. no thermal protection needed.

    Was a 1:30 ride. Both 6.0mA batterys endend in the green color range.

  84. #184
    mtbr member
    Reputation: TwoHeadsBrewing's Avatar
    Join Date
    Aug 2009
    Posts
    2,879
    Just ordered the 872 from GeoManGear. Despite the potential heat issues, the 6.0Ah battery built in the USA and the proven customer service is a winning combo. This will go on the bars with a MJ808 on the helmet.
    "Got everything you need?"

  85. #185
    mtbr member
    Reputation:
    Join Date
    Apr 2011
    Posts
    52
    Quote Originally Posted by TwoHeadsBrewing View Post
    Just ordered the 872 from GeoManGear. Despite the potential heat issues, the 6.0Ah battery built in the USA and the proven customer service is a winning combo. This will go on the bars with a MJ808 on the helmet.
    I ordered the 872 from Geoman for the same reasons. The heat issue doens't appear to be a factor where I live. And to be honest, the 3 highest settings aren't that different. The lowest setting drops down quite a bit, but the higher three are very similar to me.

  86. #186
    mtbr member
    Reputation: TwoHeadsBrewing's Avatar
    Join Date
    Aug 2009
    Posts
    2,879
    Quote Originally Posted by bluewave View Post
    I ordered the 872 from Geoman for the same reasons. The heat issue doens't appear to be a factor where I live. And to be honest, the 3 highest settings aren't that different. The lowest setting drops down quite a bit, but the higher three are very similar to me.
    That's good to hear. Here in northern California the heat is only really an issue on summer nights. This time of year it's 60-70F at the beginning of my night rides and down into the upper 50s by the end. I don't imagine overheating will be a factor, and if it does power down to 70% that will still be plenty of light.

    I picked up a solid bar mount from Chris @ BikeEmpowerment.com as well. My 808 bounces around on the bars during really rough sections, so hopefully the new mount will solve that problem.

    "Got everything you need?"

  87. #187
    mtbr member
    Reputation:
    Join Date
    Nov 2008
    Posts
    33
    Quote Originally Posted by TwoHeadsBrewing View Post
    That's good to hear. Here in northern California the heat is only really an issue on summer nights. This time of year it's 60-70F at the beginning of my night rides and down into the upper 50s by the end. I don't imagine overheating will be a factor, and if it does power down to 70% that will still be plenty of light.

    I picked up a solid bar mount from Chris @ BikeEmpowerment.com as well. My 808 bounces around on the bars during really rough sections, so hopefully the new mount will solve that problem.

    did you ordered for the 872? the pic its for the 808 and you said that 808 would use it on the helmet.


    I also ordered, the mount adaptor for the 872. No bounce at all.

  88. #188
    mtbr member
    Reputation: TwoHeadsBrewing's Avatar
    Join Date
    Aug 2009
    Posts
    2,879
    I did order the 872 mount, which has a longer, flatter mounting area where is screws into the light. Can't wait to have a nice solid mount and >1000 lumens OTL of floody light!
    "Got everything you need?"

  89. #189
    mtbr member
    Reputation:
    Join Date
    Nov 2010
    Posts
    2
    have any of you seen the handlebar mount Magiclight is doing for all Magicshine lights? assume it will replace current o ring mounting system .... about time

  90. #190
    mtbr member
    Reputation: TwoHeadsBrewing's Avatar
    Join Date
    Aug 2009
    Posts
    2,879
    I got my solid bar mount today from BikeEmpowerment.com AND my new MJ-872. I'll be heading out shortly for a night ride and will be taking some comparison photos. I'll post back when I have them online.
    "Got everything you need?"

  91. #191
    mtbr member
    Reputation:
    Join Date
    Apr 2006
    Posts
    2,726
    I also have the bikempowerment 872 mount. The only thing I did was add a lock washer between the light head and mount to make it fit slightly better, because the light didn't sit flush against the mount, he didn't grind away enough clearance. Not a big deal though. Plus I substituted a #6-32 x 1/2" machine screw for the original screw that came with the light, so I could have a few more threads, because the new mount was slightly thicker even with his boring out the hole.

  92. #192
    mtbr member
    Reputation: TwoHeadsBrewing's Avatar
    Join Date
    Aug 2009
    Posts
    2,879
    Here's the pics of my MJ-872 and mount. The mount worked perfectly for me, no modification needed. I'm pretty stoked about having a light that doesn't move around.

    Magicshine MJ-872
    "Got everything you need?"

  93. #193
    mtbr member
    Reputation:
    Join Date
    Apr 2010
    Posts
    12
    I ordered the MJ856 on Monday from brightstonesports.com and received it on Thursday. I have had one night ride and it's an amazing upgrade from my old ms900. Here are the weights:

    MJ856 - 118g,
    MS900 - 108g,
    MS 5.6Ah Battery - 297g,
    Old GMG MS (recalled) Battery - 325g.

    Pics are at photobucket.com/shemersMSLights (I don't have enough posts to insert pics here). I included a stack of 21 quarters as a control if anyone wants to check my scale.

  94. #194
    mtbr member
    Reputation: TwoHeadsBrewing's Avatar
    Join Date
    Aug 2009
    Posts
    2,879
    Just did another night ride last night, and have to say that the MJ-872 is one amazing light. It's ridiculously bright on high, on 70% it's as bright as my MJ-808, and is still plenty bright for medium speeds on 50%. The lowest setting is perfect for slow climbs, and conserves battery life.

    Rode some really fast technical descents with tight corners and lots of brush, and never felt the need to slow down. Going from running two MJ-808's this is a BIG upgrade and totally worth the cost.
    "Got everything you need?"

  95. #195
    singletrack bound
    Reputation: Tone No Balone's Avatar
    Join Date
    Dec 2004
    Posts
    2,569
    same here on the MJ-872.....using as a bar light (only light) and I have found that I am comfortable with the 75% setting for most riding and even the 50% setting for a tad slower stuff. Don't really need to us the 100% setting if at all! One bright light......

  96. #196
    mtbr member
    Reputation: gticlay's Avatar
    Join Date
    Dec 2007
    Posts
    6,637
    It looks like you would need to put paste between the smooth body and the heatsink where they slide together. That can't be a very tight fit, plus two layers of anodizing?
    "It looks flexy"

  97. #197
    mtbr member
    Reputation:
    Join Date
    Oct 2006
    Posts
    2,787
    Quote Originally Posted by gticlay View Post
    It looks like you would need to put paste between the smooth body and the heatsink where they slide together. That can't be a very tight fit, plus two layers of anodizing?
    The separate heat sink section is a weak point by my way of thinking. They should have just made it out of one piece and machined the fins like the front section. The problem with consumers attempting to apply a thermal compound is that the heat sink can't be removed without desoldering the power cord.

    With that said....I still like my MJ-872 very much.

  98. #198
    Village Dirtbag
    Reputation: @dam's Avatar
    Join Date
    Jan 2004
    Posts
    2,276
    I got my 856 yesterday and had it on the trail within hours. Awesome! It's not much bigger than my 808, but DAMN does it blast out a lot of light. Low is fine for climbing, and 50-75 are fine most of the time. 100 is just blazing. The beam is so wide and bright that this could be an only light, even mounted on the bar. I had lent out my 808, so I had a MiNewt on my head and I could barely tell the thing was on.



    I'd shut it off while stopped to save battery, but it never got warm to the touch. It was cool out though- maybe mid/low 40's. I ran it stationary on a table for 15 minutes when I got home and it got a bit toasty, but not too much warmer than my 808- especially considering how much more light it was putting out. It didn't get warm enough to step the power down.

  99. #199
    singletrack bound
    Reputation: Tone No Balone's Avatar
    Join Date
    Dec 2004
    Posts
    2,569
    Adam
    wanna git Hi?

  100. #200
    mtbr member
    Reputation:
    Join Date
    Nov 2009
    Posts
    42

    Bonking ... not feelin' well Has anyone had overheating issue with Magicshine MJ-872??

    So I ordered my mj-872 on ebay, did some night riding around town at night to test it out first.

    First, I noticed the battery indicator showed up 'Blue' instead of 'Green', and didn't last more than an hour(claimed 2hr run time with 100% brightness)

    Here comes the real problem.

    After about a minute, the light head was overheated and the brightness stepped down to the lower level(75%)
    Please note that I was riding on the road(and It was about 15 degrees Celsius outside, more than enough to keep the light head cool) It stayed at the 75% brightness, and never returned to 100% max-output automatically, and the light head was just too to even touch.

    The package was returned for a replacement set after testing it three times. Waiting for the new set to arrive in a day or two.
    I'm just hoping that it was NOT the design flaw since their 14day return policy has passed.

    Had anyone had the same overheating issue??

Page 2 of 3 FirstFirst 123 LastLast

Similar Threads

  1. Review & dissection of magicshine battery mj-828
    By find_bruce in forum Lights and Night Riding
    Replies: 13
    Last Post: 03-09-2012, 12:21 AM
  2. Magicshine 2300 Combo Review.
    By twowheelsdown2002 in forum Lights and Night Riding
    Replies: 1
    Last Post: 05-17-2010, 02:20 PM
  3. Magicshine Lights Review (MJ-808 and MJ-816)
    By lticew in forum Lights and Night Riding
    Replies: 0
    Last Post: 04-20-2010, 08:25 PM
  4. MTBR 2010 Magicshine MJ-808 review
    By The Singletrack Store in forum Lights and Night Riding
    Replies: 14
    Last Post: 12-03-2009, 03:01 PM
  5. quick Magicshine review
    By beastwood9 in forum Lights and Night Riding
    Replies: 42
    Last Post: 11-21-2009, 05:38 PM

Members who have read this thread: 0

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •