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Make Your Own Mega-LED Bike Light

High-powered ultra bright LEDs, a series of lenses, and a home-built power supply. Aluminum heatsink and a flashlight casing, mounted to your bike for incredible night biking fun.

The instructions for this DIY bike light are written in Finnish, and the translation isn’t perfect, but the photos have enough guidance to help you put together a blindingly powerful setup that lights the trails to near daylight.

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180 meters away from the birch stand out clearly. Power LEDs in these pictures is only 0.9 amps, because the available AA-size cells would otherwise run out too quickly. Now, on a single charge to drive about 1.5 hours and the light is still very adequate. Full power, or 2 amps of power I use a lithium battery that is also lighter.

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A comprehensive list of other DIY LED bike lights can be found at yojimg.net.

Related: This is the best tail light I’ve found: the Blackburn Mars 3.0. The awesome amber side LEDs were the key selling point (not to mention it’s only $16). I’ve had mine four years and still running strong. And, I reviewed it in WIRED when I was working there (link).