Will a hub dynamo power a ebay cree xml flashlight?- Mtbr.com
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  1. #1
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    Will a hub dynamo power a ebay cree xml flashlight?

    I got this idea that I could just solder wire leads instead of running it off a battery and power my cheap ebay cree xml t6 with the dynamo hub?

    Forgive my lack of electrical knowledge. Some thing about ac/dc non compatibility and regulating the power from the hub because it is fluctuating is my lack of knowledge here.

    Thx in advance.

  2. #2
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    These are a good candidate for dyno conversion because they are cheap and usually easy to get open.

    You need to replace the driver with a rectifier and smoothing cap. It will only run about 500mA so about 1/4 as bright as the original.

    You can improve this by replacing the XML with the 6V or 12V version (effectively 2 or 4 LEDs in series). The 6V will be 1/2 as bright as the original and the 12V the same brightness. But you lose low speed performance. 6V is the sweet spot for low speed performance and

    See here for some circuit options...
    Dynamo LED Light Systems for Bicycles (electronic circuits)

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