Okay, as promised: here is a couple of photos of my new light setup using a Luxeon V star emitter:

Parts is parts: these parts are from my light!

The above image shows (on top, l-r) the tailpiece screw-on connector, the tailpiece itself, and a PVC endcap. Below it is the Luxeon star installed in a lens with the heatsink in place and the buckpuck attached. All this will be inside the tailpiece. The switch for the light will be on a small box attached to the handlebar.

I have turned this on for just a few seconds to see how it will work. It seems to be MUCH brighter than my 6v NiteHawk light!