Re: Petzel TIkka &zipka
My only gripe about the Tikka is the rate at which the brightness drops off. I've never seen a runtime/brightness chart for one, but the brightness seems to drop off too fast.
I end up hiking in the dark a lot, partly because I like to hike at night and partly because work and family obligations often cause me to leave and/or return to the trailhead in the dark. The Tikka worked fine for me for a few hours after changing the batteries. Last time I tried to get two trips out of one set of batteries, I had to let my buddy lead us out to the car. I had enough light to follow him, but not enough to easily stay on the trail. I could have just changed the batteries, but hopefully you get my point--Forget about any runtime claims. In my experience, a fresh set of AAAs will give you maybe 4 hours of good routefinding illumination . . . maybe a little more.
I'd like a lightweight headlamp regulated like the ARC LS or Surefire KL1, but it does not yet exist. This summer, I'm going to play with my LS, KL1 and Turquoise AAAs to see which I like best.