Petzl SWIFT® RL Headlamp
How Something this small can put out this much light is unbelievable
I used this during the Silverton 100 and it worked great. Lightweight, comfortable, it stayed put on my head. Didn't really get to check out the battery life completely but it lasted from about 9p to 6am the next morning on the lowest reactive setting, which was enough light for me to see comfortably. As a comparison, my pacer had a BD headlamp on medium setting and it died about 4am.