Have you considered the Gerber Infinity Ultra? Not nearly as bright as some of the others, but a very long runtime on a single AA cell, and it will take either alkaline or lithium cells. I gave one each to a couple of non-flashaholics, and they called it, "The best flashlight I've ever owned!" Okay, they don't have much experience, but it is supposed to be tough, and can frequently be found for under $15 on the web. Small enough to easily edc, and the clip will allow you clip it to the bill of a baseball cap for hands-free use if you are so inclined. Only one level, screw-on/screw-off, and you can't access the head to mess with the led. They are not perfect - the body anodizing covers the reflector, which is exposed and collects lint. I bought a few on clearance sale a while back for $5 each, and I consider them about the best bang for a buck I've ever found in a flashlight. I got them to give away, except for one which I keep as a loaner, if needed.
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