I modified a Lowe's Task Force 3W Cree Flashlight to be a dynamo light. I ripped out all the battery regulation circuity (saved them for other projects) and replaced it with a bridge rectifier hooked straight up to my dyanmo hub. Then I hacksawed off the excess space in the flashlight body to make it more compact and mounted it on the bike. It works great and much brighter than the Spanniga Dynamo light I used to use.