Yesterday I recommended a baseball cap with 2 built in LEDs from http://www.gofastandlight.com/default.asp as a great idea for a hands-free light. I found that the cap has a serious problem; the LEDs are severely overdriven, running at 6 volts instead of a normal 3 volts. At this voltage the LEDs will not last any longer than an incandescent bulb. The problem can be easily fixed. Get 2 US pennies and sand the surfaces lightly. Remove one of the 3V button cells and replace with the pennies. The light is still bright enough for walking at night and at 3V the LEDs should last about 100,000 hours. Overdriven LEDs are a problem with many of the cheap flashlights imported from China. They are very bright but at the cost of having the LEDs fail quickly. If you are going to depend on one of these flashlights use a multimeter to measure the voltage drop across each LED; it should not be higher than the rating for that LED, usually 3 volts.