I use my headlamp at least five nights a week. I've used the same one for almost a year now, in rain, snow, all temperatures. It's been magnificent!
So nice I bought it twice (one for a back up): the Princeton Tec Apex Pro.
Since I've standardized all my lights to cr123 lithium batteries, the Apex Pro was the best one I could find that is small, light, shatterproof, waterproof, and has two wide beam and two narrow beam settings with an SOS thrown in extra. The run times are great, I can stuff it in my pocket with a couple of extra batteries, and it's very comfortable on my head for long periods of time.
I can't recall exactly, but the lumen output on high, narrow beam is about 190 for 1.5 hours. The wide beam on high (which is the one I use most) puts out 90 lumens for about 10 hours. The throw on both these settings is exceptional. I get thirty strong yards on wide beam. On high narrow it's way over one hundred yards. You can switch between settings with a simple press on the lamp underside.
The batteries are easy to change on the fly. The headlamp signals you by flashing when there is about twenty minutes of runtime left. I really like that feature since I can choose to change at the first opportunity, or just finish up knowing I still have some time. I've changed them in the middle of a pouring rain with no trouble (I shielded the battery case with my body against the wind).
I spot a lot of animals at night by the glow of their eyes. I saw a mean looking, fearless possum last night (that I circumvented). And tonight I saw a mother raccoon with two kids following her. Lots of rabbits too. The wide beam catches their eyes, then I can power up the blinding narrow beam to clarify them.
I posted a thread on this forum asking for a better cr123 headlamp, but recieved no better suggestions than the Princeton Tec Apex Pro.