kd 2 problem. Help- Mtbr.com
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  1. #1
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    kd 2 problem. Help

    Just received a kd 2xcree xlm-u2 and when I plug it in no light,just the switch blinking red-green. Tried different batteries, same result.

  2. #2
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    Quote Originally Posted by grande y veloz View Post
    Just received a kd 2xcree xlm-u2 and when I plug it in no light,just the switch blinking red-green. Tried different batteries, same result.
    May be you got a 4.2V version, try hardwiring a single 18650 battery(3.7-4.2V) and see what happens

  3. #3
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    Quote Originally Posted by grande y veloz View Post
    Just received a kd 2xcree xlm-u2 and when I plug it in no light,just the switch blinking red-green. Tried different batteries, same result.
    I think the LED board short circuit, so that switch LED working but front LED doesn't working. Just send back to seller for repair...

  4. #4
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    You got the 4.2 volt version. See Posts 35 & 38 in the KD 2 review thread.

    You could buy the ten step driver with neutral LED board and upgrade it!

  5. #5
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    Thanks for the replies. It works at 4 volts.

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    Quote Originally Posted by grande y veloz View Post
    Thanks for the replies. It works at 4 volts.
    Actually the working voltage is 3.0V ~ 4.2V!
    NITEFIGHTER BT40S 4xCree XP-G2 Neutral White LED 1600 Lumens Mountain Bike Light

  7. #7
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    Is there a disadvantage to having the 4.2 volt version?

  8. #8
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    Quote Originally Posted by grande y veloz View Post
    Is there a disadvantage to having the 4.2 volt version?
    Other than the fact that you have to use a 4.2 volt battery it is hard to say. It's possible that the driver is also providing lower output ( or higher ) but no way to know that without testing one.

    Anyway, generally speaking the standard set-up for most of the Chinese lamps is 7.4-8.4 volts. As such those types of after-market batteries are easier to find.

    Looking at the Kaidomain website I see that there are other types of lamps also listed as KD 2. I think this is where the confusion lies. Initially in this thread the designation "KD2" was being used to apply to the Duo clone ( with 10 level sub-menu ) sold by Kaidomain. If you bought one of the other style lamps also listed as KD 2, sold with a battery bank, those lamps are the ones powered using a 4.2 volt battery set-up. When you buy something from K/D you have to read the product description to make sure nothing important gets by you as not all lamps are the same. Typical things that vary are things like; Battery voltage requirements, "with or without battery", LED's, driver mode set-up, driver power output and lastly power cord/plug type.

    Anyway, while I was looking over some of the stuff on the website I noticed that the KD 2 Duo-clone is now available with "neutral white" XM-L2 U2 so it's not necessary to order just the neutral boards. ( *Sigh* ) Now I wish that I had waited before ordering the boards....AND, FWIW, they are also selling a neutral version of the MS880-clone. Apparently Kaidomain has gotten the message: Neutral LED's are IN.

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