A friend of mine just brought home one of these.

http://www.serfas.com/lights/HLM-1.shtml

I should point out that this one uses two AA not three AAAs. IT seemed to be every bit as bright as as my Petzl Myo XP headlamp which is supposed to have a luxeon III emitter. Then I checked the Serfas web sight and found this.

http://www.serfas.com/lights/HLM-2.shtml

Sounds like the same thing as the top one specifically designed for helment mount.

I'm thinking I could get two to augment my Cateye triple shot. Has anyone tried one?