This is awesome. Buy a cheap $5 flashlight and hack it so that it runs for 1000 hours.

The hacker-author of this article bought an Eveready from Home Depot that was marked 10X and showed a 130 hour runtime. He also pick up some watt Resistors. Check out how he makes the modification and the detailed information regarding his output results and runtime results. Lots of excellent information here.

Flashlight Hack: Make A $5 Flashlight Run For 1000 Hours