I guess that I should mention that I also have an old Petzl Duo, the one before LED's, with two bulbs, one for close up battery saving use, and long distance juice eater. Uses four AA's, and is a lot larger and heaver than most headlamps seen today (altho they still make an upgraded LED version). I have my eyes on the Petzl Adapt system, just haven't popped for one yet...