I have a LED lenzer, great headlight but major issue for me is that the rear red light cannot be turned off against accidental switching on like you can the main light. Unless you undo the back and isolate a battery it often turns on in my pack and runs out of power. Black Diamond as a spare, Prtezl as a last back up. Before you laugh at my OCD I needed all three on Scarfell in the clag a couple of months ago getting some ill equipped (although good for the car park) walkers off after dark.