The best alternatives to OnlineBikeLight.com are Revolights, HALO BELT, and Blaze LaserLight. If these 3 options don't work for you, we've listed a few more alternatives below.
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Notion— Get over $6,000 worth of Notion + unlimited AI, for free
Lil' Lite might be little, but it's got big potential! I made it for fun, and becuase I wanted a bike light that's: 1. Easy to use (magically turns on and off by itself) 2. Fun (unlimited patterns) 3. Long lasting (20 hours) 4. Hackable and open source