I've been running a pair of EvoPro LED's that run on AA's. Theyre about as bright as my old 10w halogens. I love the battery change once a week.
Of course i'd like a bit more light. Have you thought about LED setup? The battery idea is great. Heck i'd love to run everything off of a central battery, taillights etc.

Love to see someone tinkering. Keep it up.