If you're looking at generic flashlights, you can do better or cheaper or perhaps both. The UltraFire 500 lumen flashlight is $12, still around $20 with a pair of 18650 rechargeable LiIons and a charger AND a lockblock to mount it. This isn't anything new, that's been the price for over a year.
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Work: the 8 hours that separates bike rides.