400+ lumen bike lights in the < $50 category have just sprouted like mushrooms on eBay in the last 6 months or so. I bought one and it's super impressive - brighter than the Magicshine I've had for 3 years now, about the same quality. Beam pattern is more spotty but a replacement lens fixes that for another $6.
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Work: the 8 hours that separates bike rides.