I've been a part of some of the LED FLASHLIGHT forums for a few years now and find the advice from members to be invaluable. Now looking for an led headlamp but not quite sure what a great headlamp must have. I know I need it to be incredibly tough/bulletprooof and reliability is a must. I've learned this much along the way with my flashlights. Other than that, are there any specific threads I should read up on first before I begin my search?