If an LED or standalone light is a must I can't truly help you. I have a Radio Shack Emergency crank radio which contains an incandescent lamp (5 hr life so stock up on spares) and shortwave bands. While 90 seconds in necessary for the radio a few minutes is a good idea if you want decent runtime on the light. Along with the hand crank and rechargeable battery, you have an AC/DC adapter option and a 3 AA battery option. I also don't know if it can charge from AC. Also in hand crank mode (with rechargeable battery) you can also charge Samsung, Sony Erricson, Nokia, and Siemens cell phones or virtually any USB device (iPod?). I don't really have any runtime data.