Thanks for the review. I'm considering one on the two is one, one is none principle.

My current headlamp is a Princeton Tec EOS which has very good reach if you use the high setting, but has huge runtime on low; for most things I do with a headlamp the light is very useable on the low setting. Most importantly, it uses AAA batteries that are relatively cheap and easy to find and can also use lithium or NiMH AAA's.

What I'd really like to see is a headlamp that used a single AA and a single 5mm LED with no lens, similar to the Gerber Infinity Ultra -- fully regulated and waterproof/dunkable.