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  1. #1
    mtbr member
    Reputation: Lagopus Lagopus's Avatar
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    Oct 2011
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    28

    Dynamo Light Question

    I am on the verge of getting a dynamo light set up. But in selecting a light I was wondering if using a brighter light would create more drag? Does a brighter light, using more energy mean I have to work harder to keep the dynamo turning? Or, even if a brighter light does require more input from me, is this so negligible that I should not be concerned.
    I lack even the most rudimentary understanding of electronics, so forgive me if this is a completely stupid question.

  2. #2
    mtbr member
    Reputation: znomit's Avatar
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    Dec 2007
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    1,644
    Roughly 50% efficiency, so driving an LED at 500mA/3V is about 3 leg watts. Multiply by the number of LEDs.
    DIY LED Bike Lights:
    A few Dynamo builds and some Small battery lights

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