The little ad they always put inside the envelope to return your credit card bill had something interesting in it today. They had an ad for a wind up LED light that claimed an hour of runtime with 60 seconds of winding, no batteries. I think it had 3 or 4 LEDs and was $19.99. I've used the wind up radios with much success, it's nice not having batteries to run out. Anyone ever try these for a bike?