Thanks guys, a lot of good insight. I'm currently running a Princeton Tec Apex rechargeable headlamp which is about 500 lumens if I recall. I typically run on full brightness unless there is strong moonlight. I hike solo at night up 3 to 4,000 foot mountains; mostly wooded rocky trail but some open areas and in some cases bald face tops. I know some people like to run on the bare minimum for for me too much is never enough. I always carry a backup; I have a second Apex and also a Black Diamond 4 AA battery unit which does not recharge and is not as bright, but has a long run time.
Anyway, I decided to go with the Nitecore HC35 plus a spare 21700 battery, Some of the other choices offered were very nice, but the Nitecore offers several different battery options and includes the adapter. The runtime vs lumens also seemed to fit what I wanted best, at least when carrying a spare battery.
The custom built lights are probably superior, but I needed something quickly and it appears I'll have this headlamp tomorrow.
This site is awesome, glad I found it.