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Thread: 5* Cree drop in LED

  1. #1

    Default 5* Cree drop in LED

    Dear readers,
    I am new in this forum, and I hope to find some help, and to give some support where I can.
    I am diving for +30 years, and up till now making my own UW lights.
    So far happy with Solux daylight spots, but now heading for LED's.

    Bought one 5*Cree 2R drop in : http://www.dealextreme.com/p/5-cree-...8-4v-max-35241
    Applying power 8,4 V on it + centre, -body, and the other way around.
    No light!

    Does anyone know how to wire it?
    Thanks for helping.
    Henk van Ooijen

  2. #2
    Flashaholic* fivemega's Avatar
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    Default Re: 5* Cree drop in LED

    Quote Originally Posted by hjvooijen View Post
    Applying power 8,4 V on it + centre, -body, and the other way around.
    No light!
    Are you sure applied power was not over 8.4 volts?
    Are you sure your negative was connected to brass part of module (not alminum)?


    Quote Originally Posted by hjvooijen View Post
    and the other way around.No light!
    You may burn the module.

  3. #3
    Flashaholic
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    Default Re: 5* Cree drop in LED

    I own one of those modules. It is installed in a WF-500 host. It has good output and respectable throw. I would never dive with any light this module was in. The reliability factor just isn't there. Go to the dive lights sub forum and see what is popular among those who are knowledgeable (Not me for sure).

  4. #4

    Default Re: 5* Cree drop in LED

    Quote Originally Posted by fivemega View Post
    Are you sure applied power was not over 8.4 volts?
    Are you sure your negative was connected to brass part of module (not alminum)?



    You may burn the module.
    thanks for your reply,
    I did +on the centre spring, - on the outer spring which is connected to the brass part.
    8,4V exactly.
    Can this unit be switched by power on and off several times on these springs?
    Hope I can get it alive

  5. #5

    Default Re: 5* Cree drop in LED

    Quote Originally Posted by Quest4fire View Post
    I own one of those modules. It is installed in a WF-500 host. It has good output and respectable throw. I would never dive with any light this module was in. The reliability factor just isn't there. Go to the dive lights sub forum and see what is popular among those who are knowledgeable (Not me for sure).
    Thanks for your reply,
    Is, in your opinion, the low reliability caused by the driver quality?
    For me this unit is my first try with these super leds. I hoped to avoid to difficult electronics to for me to work with.
    I'll consult the people in the forum you mention, Thanks.
    Henk

  6. #6
    Flashaholic
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    Default Re: 5* Cree drop in LED

    Is, in your opinion, the low reliability caused by the driver quality?
    Where to start. First, these modules are mass produced often with poor quality control. Most problems with bargain stuff from china seem to be related to poor/cold/dead solder

    joints, poorly performing driver circuits, excessive heat, or not working on arrival. Don't get me wrong, I've bought two of these and they both perform well. I just don't personally

    think it should be a drop-in in any flashlight the goes under the water and may quit if bumped or for no apparent reason. To me, that's like having your light fail while in a tight spot

    caving. Talk about the stuff nightmares are made of! I would want a light that is bomb-proof.

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