Originally Posted by
unterhausen
I am not sure that you can't charge while the light is on. The Luxos U has a battery which gets charged with the light on. It's there to provide power when you go slow, or you can push the button to go into "high beam" mode. Once the battery is charged, you can get some current out of the usb. Depends on the device you are charging, the intermittent nature of the power drives my garmin 800 crazy. Not really crazy, but the "external power lost" warnings get really old really fast.
I'm just quoting myself from earlier here -
Yeah, the Luxos U, though you should realize that it doesn't put out light and charge at the same time. It's one or the other. (I don't recall all the specific of if you could charge something that was very light draw, but I've read that you cannot charge, say, a phone and have the light on at the same time).