This was a no-brainer conversion using a drop in LED flashlight conversion by TerraLUX in an old Eveready Captain flashlight and a Wald flashlight bracket.
Here's the how-to link: http://cycle-truck.blogspot.com/2010/11/make-powerful-led-bicycle-headlight_20.html
Here's the how-to link: http://cycle-truck.blogspot.com/2010/11/make-powerful-led-bicycle-headlight_20.html