That's good info Steven, but it's not helping me from going info-overload on CPF, which has taken up my morning already. ;P
Ideally what I want is a good flood with high run times on medium/low (i.e. able to work around camp comfortably) settings, at a good weight to runtime ratio. Regulated output regardless of batteries is a must, I wasn't aware that all AA lights were regulated, but I am aware that most AAA headlamps are not.
I will couple this with a compact but high powered flashlight, since I often do heavy night hiking. I've been forced into multi-hour night time egress on multiple occasions.
I'm willing to go with non-standard batteries for the flashlight, as I don't think it'll see more than a few hours continuous use on a trip, and would rather higher output and run times without carrying extra batteries.
I used a Petzl (Tikka XP I think?) for years, and hated it, it's crap for hiking at night, crap for working in camp, etc.
I'm not sure the right solution honestly. Since I cut my hair, I'm able to wear hats, and usually do when hiking, but I also use poles, so I'm not sure how well I"m going to be able to hold a light and hike, but I also don't like wearing a headlamp to hike, glare bothers me, and I'll often need/want to be wearing a cap.
Anyway, I'll keep researching.