Sorry, I was really a bit hasty and not specific enough. I am after long run times and variable levels but with an emphasis on the low end rather than the high. And a floody beam rather than a thrower. I have a H501 but it's erratic operation and problems have put me off a bit - just exploring what other options are out there. Battery type either AA or AAA. I don't want to spend lots as a headlamp is not my primary illumination - its more for reading in bed and general camp chores. Quite tempted by the Icon Irix, in fact I love the idea of a rotary knob, but I wonder how the low setting would be.