"The Amazing 2000-Hour Flashlight" shows how to add a 30-cent resistor to a $5 flashlight and create a light that produces useful illumination for 2000 hours on the same battery. Detailed instructions. 54 illustrations. A half-hour project. No soldering required! The standard for “useful light” is defined and various lights compared to it. Brand names and part numbers and where to buy them (Home Depot, Radio Shack, etc.) are all identified. Related topics include bypassing the resistor, rechargeable batteries, how to substitute other battery sizes, and competing long-life products (though, as it turns out, nothing comes remotely close to 2000 hours). A free chapter from "Lanterns, Lamps & Candles," a different book by the same author, is included as a bonus. The Forward to "Flashlights" was written by Gaye Levy, proprietor of the Web site "Backdoor Survival."