Just a FYI on my experience with a Petzl e+ Lite.
I do like this LED headlamp. It is small, powerful, easily, adjustable, and has a reported 45 hour burn time. It has 2 intensity settings in white mode on one in red mode. I used it primarily in red mode, per Mike Clelland's recommendation, and thought it was great. A much mellower experience that the stark WHITE typical of most LEDs. And if it extends battery life, then so much the better.
However, on night 2 of a recent trip the multi-position switch became nearly inoperative. I thought I was going to break it before it would move. I struggled with it for 2 more nights, then on the 3rd night the switch became nearly free floating.
I had sent it to Petzl and got a call today saying they have seen "one or two" like this. The ratched/detent inside the switch freezes.
They are sending another, covered under warranty, no charge, to me. They were easy to deal with and I appreciated the phone call regarding the outcome.
I did ask I there was something I could have done to break it, or if I could have fixed it in the field. The answer to both questions was Nope. It just happens.
I feel this is a great light and it will still be my primary light on upcoming trips. But, if others have problems I'd appreciated hearing about them.