Re: Cool Idea for a high powered LED headlight
Contrary to popular belief LED are not that much more efficient than incandescent and markedly inferior to flourescent. However they have the HUGE advantage in bike applications of mechanical ruggedness.
Also note that Cree (jaffa! sorry, SG-1 fan) and Luxeon type, although quite sexy, are not cost effective compared to multi-LED versions. For a bike any light in the range of 50-100 LEDs running off AA cells will be hard to beat. Brighter and more efficient than any of the alternatives. And with 6-7hr time before recharge it's not worth screwing with white wire issues unless you do MOST of your riding at night. Certainly the best option if you only get caught after dark once in a while like me.