Apex | Princeton Tec
I've had this one for several years. 200 lumens with the big LED lamp. Regulated circuitry (very important for LEDs apparently) Waterproof to IPX7 as I recall.
I actually broke (pretty sure it was my fault) one of these a bit last year and sent it in and Princeton Tech sent me a new one no questions asked. It has several features that are very handy.
Read the description and specs carefully. I really value the fact of having a powerful single beam LED to see long range (hey we could start a new website called Long Range Headlamps) and then several smaller LED's for low power consumption and 2 different power mods of those. Most of the time you obviously don't need the long range power, but when you need it, you really need it.
I've needed it numerous times and now really try not to buy a headlamp without it. 20+ years of headlamp use for alpine mountain climbing, open ocean sea kayaking, wildland firefighting, hunting, backpacking, etc. has formed these opinions and going through probably a dozen headlamps has currently brought me to this particularly headlamp--probably others out there that work as well.
You can buy it with AA or CR123 batt packs. I still prefer the AA's as they are the most universally available battery and so you'd be more likely to find AA's in some out of the way place so that your headlamp works. I'm very partial to the Energizer Lithium AA's as they pack alot more power than alkalines, especially in cold conditions, they probably weigh 1/2 or less than alkalines and have a shelf life 2-3x alkalines. I'm pretty anal with batteries I'll be using in backcoutry adventures, testing each one before they go in my pack to know exactly what I've got. Too many adventures ruined or changed dramatically due to folks not taking care of their batteries. Smokejumping also taught me the importance of this where the consequences of not being aware of the condition of your batts. could cause problems. Sorry for the battery diatribe, but reasons immediately listed above make it imprortant. YOU don't want to be the guy that causes those problems!