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  1. #1
    Kir
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    User review: YINDING YD-2XU2 (Gemini Duo clone)

    Nobody has written a review of this popular light so I'll do it
    Sorry for any possible errors or weird spelling - english is not my native language. Feel free to ask me any questions about this light, I'll try to answer them all.

    https://www.fasttech.com/p/1443727
    You can buy it here and on other websites. I'm writing a review of this custom version with XM-L2 neutral white leds:
    Free shipping 1Set CREE XML2 T6 3B Bike Light 1600lm Waterproof Bicycle Light LED HeadLamp + 8.4v Battery Pack + Charger-in Bicycle Light from Sports & Entertainment on Aliexpress.com


    «Lights reviews - Yinding 2xU2 (Gemini Duo Clone)» all pictures are available here, you can also view high-res originals (click on any picture, bottom-right corner will list all resolutions, use google translate if needed)

    PACKAGING / CONTENTS
    Cardboard "gift box", used for many chinese bike lights:

    You'll get the light, battery, charger, headstrap mount, 2 rubber rings for handlebar mount and the box.

    DESIGN

    This light is a direct copy of Gemini Duo and probably the smallest 2 XML light that you can buy atm.
    Gemini Duo ? 2013 Mtbr Lights Shootout | Mountain Bike Review
    Gemini Duo 4 Cell front light - BikeRadar
    Gemini Duo: Nine Brilliant, High-Powered Lights | Bicycling Magazine
    You can read reviews of the original at the links above, most of the info there can be applied to this clone. Main differences between the original and the clone are much worse battery and 3 fixed brightness levels on clone vs 3 programmable levels on original.

    Light's head is very small with 2 plastic TIR lenses over the leds. Weight of the head is only 59g, dimensions are 44x23x34mm without plastic mount.
    There is a single button on the back with model name engraved near it.



    Yinding compared to SolarStorm X2 and Fandyfire D99 (another simular light with TIR lenses, but a bit larger and heavier).


    It has a magicshine-style connector, mount with piece of rubber glued on it (thats a sign of good quality light, cheaper lights don't use rubber there) and waterproof o-ring on the power cable.

    You can also rotate the mount, another rare feature for chinese lights.
    Mounting area is flat without any cable holes so you can use/make your own mount, see post #11 for example:
    User review: YINDING YD-2XU2 (Gemini Duo clone)

    BATTERY

    Usual cheap chinese battery, 4x18650 2S2P cells in shrinkwrap, 7.4v voltage. Not waterproof! You have to cover it in plastic bags/rubber balloon/gloves or something to protect it from water or it'll short-circuit like this:

    Battery capacity is kinda ok for chinese batteries but still horrible. I have 2 lights and here are the discharge graphs for them:

    Battery 1, 3600mAh with very weird unstable voltage on discharge cycle.

    Battery 2, 3200mAh with good stable voltage.
    Both of these batteries will work for about 2 hours on high mode and imo you should replace them with something better from Xeccon/Magicshine/Gemini.

    UI
    4 modes, switched with single click in this sequence: off-low-mid-high-off and repeat. Strobe on hold, high frequency, not very usable imo.

    TEARDOWN

    Lets open it up and see how its made
    Starting from the mount:

    3mm hex screw, plastic mount, 2 rubber o-rings between the screw, mount and the case.

    O-rings removed. These o-rings will hold the mount at any angle so you can turn it and leave at specific angle that you need.
    Nothing else on the bottom so lets move to the front.

    2 small hex screws (about 1.5mm) hold the front part of the case. Removing the screws and front part gives us access to the 2 plastic TIR lenses and XM-L2 leds. Both lenses and the front part of the case have rubber o-rings under them so this light should be competely waterproof.

    Leds are mounted on aluminium backplate and connected in series. You can also see that this specific version has XM-L2 leds (silver color of the led, 2 bounding wires instead of 3 on 1st gen) which the seller replaced himself...and it wasn't a very good job - there are fingerprints all over the plate and wires soldering is not very good.
    Moving on, next we have to remove 2 screws on the sides of led's backplate:

    These long screws are connected to the back side of the case.

    With screws removed we can also lift up led's backplate to discover proper amount of good thermal paste underneath - everything is ok here. And here is an important part - led's backplate is mounted directly on the outer case, there is no additional pills here so thermal transfer is excellent (unlike D99 where leds were basically handing in air).

    Moving on to the back, another view of the case inside and metal wall in the middle. There is a small hole in the center for led's wires and a hole on the side for power wire. Power wire doesn't have any pull-out protection so be careful with it.


    2 pics of the driver and we're done. Soldering looks good everywhere, driver is marked "HX-1343". There are 2 smd leds for battery charge level indication, R110 current sense resistor that you can replace to increase current on leds (not recommended though, case can't really handle any additional heat).

    ELECTRONICS

    This time I'll use a picture with every measurement:


    A few addional notes about it:
    Current from battery is measured on external PSU set at 7.5v, thats the average voltage on discharge cycle. You can divide your battery capacity on current to get estimated runtime in hours (for the included battery at high mode its 3200/1700 = 1.88 hours, a good quality battery like Xeccon 5200mAh will give you 3.06 hours).
    There are 2 values for current on leds because driver is a bit weird...it usually outputs 1.7A on high, BUT when input voltage is 6.9-7.2v it jumps to 2A. I have no idea why this is happening, but I double checked everything and it just works like this.
    Driver will go out of regulation at 6.4v on input = leds will start to dim. This is a good feature as you'll notice that even if your light is mounted on helmet and you can't see the battery indicator on it. At about 5v it will turn off competely.
    Lumens output is a very rough estimation (I don't have integrated sphere to properly measure lumens output) based on this calculator:
    LEDCalc.fonarevka.ru
    And with 20% reduction for losses in optics to calculate estimated OTF lumens. Still it should be close to real output, I verified that by calculating and comparing results for other lights/flashlights.

    IMPORTANT NOTICE!
    This light is very small and very lightweight so it will heat up VERY FAST. While moving it will be cooled by air so its not a problem, but don't run it on high mode for a long time when standing still - it can and will overheat very easily.
    Some users have reported that it has overheat protection that will dim/turn off the light but I haven't tested that and I don't recommend to rely on such protections - overheating is bad for leds and electronics.
    Quote Originally Posted by znomit
    Tested the thermal cutoff today.
    Cuts in around 70C (IR thermometer).
    No hysteresis so theres a bit of flicker before it come fully on… guess thats a good visual warning. Cuts all modes back by half.

    BEAM PROFILE

    Compared to D99 on the right:

    D99 uses the same type of lenses with wider angle (probably 22-30 degrees compared to 15 on Yinding) so the beam is almost the same. Its wider on D99 but its hard to notice on that picture.
    Compared to SolarStorm X2 on the right:

    Here you can see the difference between TIR lens and reflector. Reflectors on SSX2 have noticable sidespill and tight hotspot in the center while TIR on Yinding gives just one wide hotspot.
    You can also see the difference in color temperature in both pictures. Neutral-white XM-L2 leds have more natural-looking slightly yellow color vs blue-white color of typical cheap chinese cool white XM-L leds.

    BEAMSHOTS

    2 simple beamshots on the ceiling:


    This light uses TIR lenses (probably 15 degree wide like these ones 15 Degree Angle LED Optical Lens - Black - Free Shipping - DealExtreme) that give it a wide and floody hotspot with gradual fade at the edges, which is less tiring on the trail than usual high contrast reflector lights. Not a very good thrower though but should be an excellent light for the bars.
    Its not a pure flood light and not a thrower, its somewhere in between and works great as a single light for low and medium speed riding on the roads/trails.
    And a beamshot on the road, sorry for cellphone quality:

    And here are some beamshots stolen from another threads and sites
    Name:  1380893305947-uk6ht7ej5eno-500-70.jpg
Views: 16622
Size:  34.7 KB




    CONCLUSION

    Pros:
    Very small, very light.
    Good mount.
    Good wide-hotspot beam.
    Excellent thermal transfer from leds to outer case.
    XM-L2 neutral white leds in this version, better color rendition and easier on eyes compared to cool white.

    Cons:
    Bad batteries.
    Overheats very easily.
    No brightness levels adjustment like on original Gemini Duo.

    Overall - great light imo, one of the best chinese lights atm. Not very powerful but so small and light! I will probably use it myself as a backup light for long rides, it doesn't take much space on the handlebars and provides good amount of light for forest/trails riding.
    Last edited by Kir; 11-22-2013 at 05:40 PM.

  2. #2
    Kir
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    And another review done! Will proofread it tomorrow and fix any errors.
    It's getting cold and rainy here so hopefully I'll have more time to write my reviews. Next up is Xeccon Spiker 1206 review/comparison with cheap chinese 1xml light, I'll try to show what you're paying for when buying expensive brand name lights. After that - huge Solarstorm X2 comparison, got 9 samples here to show all the variety and lottery of popular chinese bike lights (spoiler alert - expect _horrible_ batteries and random output/random quality ).

  3. #3
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    Nicely done Kir, great review!

  4. #4
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    Excellent review Kir. Thank you.

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    Kir,

    Great job. Do you have any idea what the current draw is for the original Gemini duo?

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    Thanks Kir, excellent review!

  7. #7
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    Confused...is the one you tested use the XM-L2 or XML-U2 LEDs?
    Geologist by trade...bicycle mechanic (former) by the grace of God!

    2012 Specialized Stumpy EVO 29 HT

  8. #8
    Kir
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    Quote Originally Posted by steelhmr View Post
    Kir,

    Great job. Do you have any idea what the current draw is for the original Gemini duo?
    No idea about that, I just don't have any spare money to buy expensive lights like Gemini for testing.

    Confused...is the one you tested use the XM-L2 or XML-U2 LEDs?
    This was for XM-L2 version, still waiting for my U2 version. When I'll get it I'll add data to measurements but it should be about the same.

  9. #9
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    Seems all the places are out of the ~$50 and now its ~$80....that is Gemini territory (light head only...which is all you are really getting here).
    Geologist by trade...bicycle mechanic (former) by the grace of God!

    2012 Specialized Stumpy EVO 29 HT

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    Thanks Kir, great info !!

  11. #11
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    Quote Originally Posted by Kir View Post

    CONCLUSION

    Pros:
    Very small, very light.
    Good mount.
    Good floody beam.
    Excellent thermal transfer from leds to outer case.
    XM-L2 neutral white leds in this version, better color rendition and easier on eyes compared to cool white.

    Cons:
    Bad batteries.
    Overheats very easily.
    No brightness levels adjustment like on original Gemini Duo.
    Great review...let me add a few cents

    Pros:
    Even XML U2 version has quite nice white color light
    The cable does not come out at the mount area and this area is flat. That means you can easily adjust your own mount...like this (This goes for 880clone and SSX2 as well)



    Cons:
    there is small weak point for water...that are the screws for front panel. I wraped screws with teflon tape and now I can throw it in water and be very confident. (excluding the battery)
    no memory mode...at least press and hold function should be off and not strobe.
    Mounting O-rings are really crapy!!! Buy silicone ones!

    *the beam is actually quite tight, no where near to flood. That would be MJ872. You could say it is very floody spot light. I think perfect beam for helmet light for off road use.
    *battery is not that bad compare to other cheap bike light sets. (3x clone, SSX2...) I measured my pack to around 3500+mAh. (MJ828 battery has just 10-20% more capacity and it costs almost as Yinding whole set.)

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    That XM-L2 soldering is poor Seems to be done by hand and not in the oven.

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    Any link for the silicone rings?

  14. #14
    Kir
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    Thanks for all the info and comments! Updated few section of review.

    Quote Originally Posted by TiGeo View Post
    Seems all the places are out of the ~$50 and now its ~$80....that is Gemini territory (light head only...which is all you are really getting here).
    Not really, head only is $43 shipped on aliexpress while gemini duo is $93+shipping on action led lights.

    bhocewar, I dont think that water can get through screws in front unless you're submerging it in water
    Floody spot light is a good description for it. I'll make a few rides and then update info about beam profile.
    15 Degree Angle LED Optical Lens - Black - Free Shipping - DealExtreme - looks very simular so its TIR lenses could be 15-20 degrees too, which is kinda tight but with good hotspot brightness.

    MK96, of course its done by hand - oven is too expensive And I actually can make a much better soldering myself.

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    Do you have a link to just the head?

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    Quote Originally Posted by Kir View Post
    15 Degree Angle LED Optical Lens - Black - Free Shipping - DealExtreme - looks very simular so its TIR lenses could be 15-20 degrees too, which is kinda tight but with good hotspot brightness.
    Might be the same. I would say Yinding has 15° optics. DX measurments are 22mmX13mm. Yindings are 20,0X11,3mm. If DX didnt measure with the black housing it might be exact the same dimensions.

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    Oh and a link to any different type of reflectors to change the beam pattern?

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    Quote Originally Posted by bhocewar View Post
    Might be the same. I would say Yinding has 15° optics. DX measurments are 22mmX13mm. Yindings are 20,0X11,3mm. If DX didnt measure with the black housing it might be exact the same dimensions.
    https://www.fasttech.com/products/1144800

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    I have ordered a few different optics to see differences in beam patterns.

    I can leave one original optic in and change the rest to see what happens.

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    If you wanted a tighter beam, these 8 Degree Angle LED Optical Lens - Black might fit.

    DX also has 5, 20, and 30 degree that might fit as well.

  21. #21
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    Quote Originally Posted by Kir View Post
    Not really, head only is $43 shipped on aliexpress while gemini duo is $93+shipping on action led lights.
    Action has the 2013 Due (XML U2) for ~$70 + shipping so call it $75 (10% off). I was basing my comment on the $80 I am seeing online...I didn't see the $43 head-only option on Ali.
    Geologist by trade...bicycle mechanic (former) by the grace of God!

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    It would be nice to have two DUOs next to each other with inner lenses about 15 and outer ones with 30 - 45 to spread some light to sides. I will try that with 880 clones.

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    The fact that the AMPS get higher as the battery depletes is good news, it has either a buck or boost driver. A lot of cheap chinese lights use linear drivers which means the light output decreases as the batteries deplete. Case in point given an hours usage a light that starts out at say 1400l will probably drop well below 1000l.

    Buck/boost drivers increase the current as the battery voltage decreases, meaning light output remains the same until the batteries are almost fully depleted. I bet this light pumps out more lumens after 15-20 minutes than most cheap chinese lights that are said to pump out 1200+ lumens, and the superior heat design will also contribute to better and longer lasting brightness.

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    Kir, thanks for the great review

    Kir (or other), Can you tell me the difference between these 2...

    https://www.fasttech.com/p/1443727
    You can buy it here and on other websites. I'm writing a review of this custom version with XM-L2 neutral white leds:
    Free shipping 1Set CREE XML2 T6 3B Bike Light 1600lm Waterproof Bicycle Light LED HeadLamp + 8.4v Battery Pack + Charger-in Bicycle Light from Sports & Entertainment on Aliexpress.com

    I know that the one from Aliexpress is no longer available, but you mention "custom version with XM-L2 neutral white leds". Is this a noticeable difference? I know that the ~$50 offering from fasttech has a less than optimal battery -- but I will be replacing that with something from Xeccon (hopefully small one for helmet and larger one for bars). Will be using for commuting and when timing works out - nite riding/24 hr racing. Thoughts on the charger from the fasttech offering (safety), and how are people doing custom/semi-custom helmet mounts.

  25. #25
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    err, I just got one of these and it's great

    I don't know about using it as a backup, it is my new primary on the
    bars with zebralight h600w mkII on the noggin

    will switch to pannovo 4x18650 8.4 pack from DX with my own 18650's to
    fix the wimpy yinding pack.

    as it was, I rode 2 hours at 32 deg F and it ran
    on high the whole time with the stock 4400mah pack.

    this thing wins the tiny light race hands down
    enough lumens and throw to ride anywhere imho...not lacking in light output (to me)

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    Quote Originally Posted by TiGeo View Post
    Seems all the places are out of the ~$50 and now its ~$80....that is Gemini territory (light head only...which is all you are really getting here).
    Looks like it is back in stock. Head unit only, no battery

    Free shipping 1Set CREE XML2 T6 3B Bike Light 1600lm Waterproof Bicycle Light LED HeadLamp+ Charger (without battery)-in Bicycle Light from Sports & Entertainment on Aliexpress.com

  27. #27
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    Still....$65 head only...the 2013 Duo (head only) is not that much more.
    Geologist by trade...bicycle mechanic (former) by the grace of God!

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    Quote Originally Posted by TiGeo View Post
    Still....$65 head only...the 2013 Duo (head only) is not that much more.
    Considering the difference in price, the difference in the two vendors and the product differences I'd go with Gemini Duo from Action LED. The Aliexpress price is way too much for a lamp without battery. Duo clone ( lamp only ) should not be more than $40 tops.

  29. #29
    because GIANT
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    wallbuys has these clones

    battery + light 48 bucks free ship

  30. #30
    AZ
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    Quote Originally Posted by 127.0.0.1 View Post
    wallbuys has these clones

    battery + light 48 bucks free ship



    Link?

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    Quote Originally Posted by Cat-man-do View Post
    Considering the difference in price, the difference in the two vendors and the product differences I'd go with Gemini Duo from Action LED. The Aliexpress price is way too much for a lamp without battery. Duo clone ( lamp only ) should not be more than $40 tops.
    The aliexpress does have the newer L2 led's. I purchased this and will be interested to see how it compares to my original duo ( 2013 model), in terms of brightness and efficiently.

  32. #32
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    $46.46 Yinding 2 x CREE XM-L U2 1800LM 4-Mode White LED Bike Light / Headlamp-Red(4x18650)


    click OTHER and you can find black and blue as well

    they got this to me in US in 14 days exactly

    can track shipment here (any china ship track)
    International Track and Trace service


    Wallbuys doesn't have problems shipping batts
    Battery can ship normally
    1.Now Battery can ship normally,u can buy it from now on

  33. #33
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    Quote Originally Posted by eggdog View Post
    The aliexpress does have the newer L2 led's. I purchased this and will be interested to see how it compares to my original duo ( 2013 model), in terms of brightness and efficiently.
    The MTBR shootout measured the 2013 Duo at 1100 lumens and the 2014 at 1200, so that might be just barely perceptible. It would be interesting to see the runtime difference.

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    Quote Originally Posted by TiGeo View Post
    Action has the 2013 Due (XML U2) for ~$70 + shipping so call it $75.
    Speaking of links, do you have one for this deal? When I check the ActionLed site, I see the same that Kir does. $93.00 for the head only ... I'd certainly think about picking one up at the lower price.

  35. #35
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    There is a 10% off code...can't post link from phone but you just need to look at their main page and there is a link off it for their clearance stuff...code is in there.

    Sent from my SCH-I545 using Tapatalk
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    Ah, gotcha, thanks! Price + shipping is around $85.00, but still a pretty great deal.

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    I must have mistyped..sorry about that..you are correct.

    Sent from my SCH-I545 using Tapatalk
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    Nice review.

    I know a bit about designing LED drivers, so thought I'd add my 2 cents worth:

    1 - driver board is very well laid out, quality of soldering is the best I've seen in an inexpensive light from China.

    2 - Driver chip should allow higher voltage power supplies, but I'm not sure of the voltage of some of the other parts. One of my projects over the xmas holidays will be to solder on some different components and see if I can run the light on 11.1 and 14.8 volt battery packs. The voltage sensor in the light may be modifiable to work with other voltages. Google for SM5241 if interested in chip specs. Datasheet is in Chinese, anybody care to translate?

    3 - current sense resistor is a lower power rating than I would choose. I want to experiment with some different sized ones rated at a watt or so. On the plus side sense resistor is soldered to two fairly big copper planes that should help dissipate heat.

    4 - I'm not seeing a temperature sensor on the driver board (to dim LEDs if they get too hot. Could be one built into the microcontroller (on side of board with push button, could be a Microchip PIC). Thermal path from housing to board not very good. I will add some thermally conductive glue and see if lights get dim when housing is hot.

    5 - my light came with perhaps a bit too much heat conductive paste between LED board and housing (your pictures looked like yous had a bit less). If you get one of these lights and the housing takes more than a minute or so to heat up when running on high, open it up and remove some of the paste with a Q-tip. Spread what's left in a thin layer on back of LED board and on housing. Keep paste away from hole for LED wires. Press board down and wiggle/slide back and forth before putting bolts back in. A thinner layer of paste will conduct heat better. I will probably experiment with using a thermal epoxy to see if that works better.

    6 - battery pack and charger not the greatest. I did not open the battery up but it looks like a low quality Magicshine pack from the outside. It has worked pretty well on a few test rides, but I never trust stuff like this till I open it up. The charger looks well laid out and soldering looks pretty decent. It does get warm during charging, so that always bothers me. It does not have an isolation transformer, so this will probably never get UL listed :-) I bought one of these:

    PANNOVO B-C04 Water Resistant 4 x 18650 Battery Pack Case for Bike Lamp - Black - Free Shipping - DealExtreme

    and it works with light and some higher quality 18650 batteries I have. The down side to this is you need to buy 4 batteries, the holder, and a charger. But you get around charge balance issues and can use good quality batteries instead of unknown quality batteries. I'm using batteries with a built in protection PCB. There is probably not a protection PCB in the battery holder so be careful if using unprotected cells.

    This seems like a well designed, well produced light. I will try to generate a schematic and report on my experiments over or after the holidays (my schedule till then is pretty full).

    mhahn
    Nimium est melior!

  39. #39
    Kir
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    Fixed one small error in electronics section, added beam profile to compare beam and color temperature.
    Finally found a good dark place near my home so I'll start adding beamshots to my reviews. They will be made from cellphone so don't expect great quality...I can't carry my DSLR on my bike so thats the best that I can do right now.

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    Quote Originally Posted by mhahn@hvc.rr.com View Post
    4 - I'm not seeing a temperature sensor on the driver board (to dim LEDs if they get too hot. Could be one built into the microcontroller (on side of board with push button, could be a Microchip PIC). Thermal path from housing to board not very good. I will add some thermally conductive glue and see if lights get dim when housing is hot.
    Mine drops to half power when the case is around 70C (which doesn't take long on the bench).
    Its jumps up and down for a bit before throttling back continuously so no hysteresis on the thermal monitoring.

  41. #41
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    I just did some research, seems that the best deal going currently is at wallbuys with a 11% coupon code so $43 with battery etc.
    Geologist by trade...bicycle mechanic (former) by the grace of God!

    2012 Specialized Stumpy EVO 29 HT

  42. #42
    Kir
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    11% coupon code?

  43. #43
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    Yep Kir, got it from retailmenot..I plugged it to test and it worked. Code is WALLBUYSALLMAGIC
    Geologist by trade...bicycle mechanic (former) by the grace of God!

    2012 Specialized Stumpy EVO 29 HT

  44. #44
    Kir
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    Great, thanks for info. This is the best deal atm and since they're using Malaysia/Switzerland post they will send it with battery too.

  45. #45
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    I really think I will "pull the trigger" for $45 just to have a different light to mess around with for my bar.
    Geologist by trade...bicycle mechanic (former) by the grace of God!

    2012 Specialized Stumpy EVO 29 HT

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    Sweet deal for 43$.

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    A summary of where to get the yinding. I checked all of the following sites for this light:

    fasttech
    dx
    wallbuys
    aliexpress
    kaidomain
    lightmalls
    ebay
    amazon

    They all had it except for kaidomain and lightmalls; ebay and amazon have it listed for much more $$ than the others ($60-70 range). It appears from reading all of these threads that only aliexpress has the upgraded xm-l2 version; the rest are are xml u2. Wallbuys has the lowest price ($43 w/coupon code). I can't find any true light-head only options; the ones that don't come with a battery are that way due to shipping issues. Anybody else want to add to this that has done some searching around?
    Last edited by TiGeo; 11-23-2013 at 12:27 PM.
    Geologist by trade...bicycle mechanic (former) by the grace of God!

    2012 Specialized Stumpy EVO 29 HT

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    Quote Originally Posted by TiGeo View Post
    It appears from reading all of these threads that only fasttech has the upgraded xm-l2 version; the rest are are xml u2.
    ??????

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    Quote Originally Posted by bhocewar View Post
    ??????
    ??????
    Geologist by trade...bicycle mechanic (former) by the grace of God!

    2012 Specialized Stumpy EVO 29 HT

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    I mean...where do you see Fasttech having XML2 Yinding?

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