I've used the Princeton Tec EOS headlamp for about a year & 1/2 and it is amazing. I highly highly recommend it. I camp quite a bit with my son's Scout troop (I'm an assistant Scoutmaster) and have only replaced the batteries twice since the original purchase - and that also included a weekend with my daughter's Girl Scout troop inside a cave (on a LOT) and 3 solid weeks of summer camp.

With fresh set of batteries and high setting it is a floodlight with a lot of side-spill. I've used it to light up skits from 50-60 feet away when we couldn't have a campfire (too dry). When walking at night I tend to use the medium or low settings. It is simple, has an easy-to-find rubbery switch, doesn't rely on just screw friction for setting its position, and uses an easy-to-use thumbscrew to open battery compartment.

Can't say enough great things about it. FlashlightReviews has all the specs you'll need.