I experimented with using a Photon Max light as my primary (well, only) light for a couple of hikes. It's bright enough for around camp the first night, then the light level drops off a lot. On a 5-day hike this summer, it was unusable by the end of the hike. (Had a spare battery in the car -- not much help, alas.)

I've gone back to my Zipka, Yes, it's heavier, and yes, it uses AAA batteries, but it provides plenty of light and the batteries last several trips.

That said, those Fenix lights are *very* tempting.