I've had a petzl myo xp (similar to OP light) on my helmet for years. Most headlamps are made to fit heads, not helmets, so the strap will be too small. Plus you need a rubber strap to keep it from sliding off.
On the petzl I removed the strap and attached to helmet with plastic tie straps and duct tape. Sounds bad but actually works good. Also doesn't look as bad as you may think. I mounted the 3AA holder in rear to balance weight f to b.
I use the petzl on flash as a "be seen" light. PB super flash on back of helmet.
Last edited by seeker333; 09-03-07 at 11:00 AM.