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  1. #101
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    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. .
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  2. #102
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    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
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    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
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    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
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    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
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    Speed: 10-15km/h
    Temp. 15-20C

  7. #107
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    Quote Originally Posted by Batas View Post
    Speed: 10-15km/h
    Temp. 15-20C
    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
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    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
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    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....
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  10. #110
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    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
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    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
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    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
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  13. #113
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    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
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    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
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  15. #115
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    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
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    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...
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  17. #117
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    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
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    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
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    FWIW, I was testing it on a chilly 55 degree, very windy night.
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  20. #120
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    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
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    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
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    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
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    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.
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  24. #124
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    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
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    30% more? Cant be... How is it possible? Lets see if I can find the head unit only...

  26. #126
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    Quote Originally Posted by Batas View Post
    30% more? Cant 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
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    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
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    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.
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  29. #129
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    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
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    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
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    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
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    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!
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  33. #133
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    Quote Originally Posted by mochodurazo View Post
    Where did you got the bracket mount?
    I'm curious as well

  34. #134
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    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
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    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
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    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
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  37. #137
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    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
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    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
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    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
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    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
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    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.
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  42. #142
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    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
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    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~
    Sorrel Seeker !!

  44. #144
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    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
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    Recommended?

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

    Thanks

    Juergenor

  46. #146
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    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
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    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
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    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
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  49. #149
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    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
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    Last nights ride my MJ-872 performed ok.

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

    Cant say that for my carbon brake lever though. My ribs hurt today.


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