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Vintage Bike Light under $10 bucks

I assure myself someday soon i will be able to understand all the jibberish that is high powered LEDs.

trying to understand what drivers, leds, heatsinks, starpowers i need made my head hurt, but i still want to build my self a light with this technology.

but for now i hacked together this out of 4 10mm leds from ebay, the brightness is pretty good, but maybe 9v isn’t the most efficient

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