You want the Sanyo!

Chainstay mounted, runs on the tread of the tire, puts out a *****in' 3W at 6V!

The big round Union style light on the Bridgestone above works well. With a Sanyo, get a 3W bulb (most are 2.4W) and use it without the taillight (which uses typically 0.6W). For the taillight, get a flasher dealy.

I used that setup for years commuting at night in Seattle.