It's a 6 volt lantern battery LED flashlight (3 leds in molded plastic shiny reflector. It's really easy to change the battery too.
I mounted it with a $1 U-bolt over some electrical tape on the handle bar. It stays put and works well enough.
You can also mount it to a cheap front rack with a single bolt and wingnut. It weighs a couple pounds, but runs a lot longer than the old 6volt gas bulb lights.
Originally Posted by LaLongueCarabine
Brilliant! A 9 volt lamp puts out a beam!
Great idea, uh, how do you mount it?