When they first started selling LED flashlights My buddy bought one. I still had a maglight. He shoots a deer right before dark and can't find blood. He called me and I came to help. I shine the ground where he shot and there is blood easily visible. He told me to turn my light off. I do and he is shining his new Whizzbang flashlight the blood disappears. I turn mine back on there is the blood again. He rares back and throws his led flashlight as far as he can. The new ones may be better. I keep a coleman lantern in case I need to look for one.