I've been thinking of making my own headlamp, probably with some Chi-wings but a salvaged Luxeon would do nicely. The idea is take a 2AA plastic battery holder, put an AA in one of the two battery slots, and a Madmax and some LED's and maybe some heat sinking in the other slots. Put a little mouse pad foam on the back and strap it to your head. Maybe the LED itself should be on a flexible wire stalk so you can adjust its direction. Result is a lightweight lamp that runs on a cheap easy-to-find alkaline or NiMH AA.