I'm a fan of lights that I have and I have a Nitecore HC90 which uses a single 18650 battery.
Zebralight all the way
Petzl for me every time,if it is good enough to use on a professional basis then it more than adequate for hobby use.
i need i headlamp for repairing jobs and at night
maximum lumen not very important
My lamp may have these advantages:
1.hight cri
2.extreme low lumen mode
both aa and 18650 is ok but cr123 is hard to find in my city
sorry for my bad english