MichaelW, It seems like you're trying to steer me in another direction. You've got some good suggestions. The dynamo light attached to the fork and powered by a rechargable battery pack sounds like a great setup.
It's hard to find these type of things in the U.S. since bikes are thought of as toys here. However, I have found a nice light called a Lumotec at
www.peterwhitecycles.com
I'm just wondering what voltage of battery pack I would need to run such a light. The light is 2.4 watts and designed to be operated by a dynamo. Would this be suitable to use with a battery pack, if not can you suggest a light that is?
The Schmidt dynamo hub that Peter White sells is also quite appealing but a little too expensive for my needs. Thanks for shedding some light on this subject.