I have 2 of these flashlights by Freeplay and they are amazing. I have a yellow one and the clear version which is cool. The idea is to crank the arm and in 1 minute you get 20 minutes of light (they say 30). The high powered lights are energy efficient and it can be charged by ac adapter as well. This is a must have gadget and has a low & high power beam.

The Xray LED is provides up to 3.2 hours of ultra bright light, or 20 hours of normal light. The LED’s are rated up to 100 000 hours or 11 years of continuous use (24 hours a day). Just buy one!