I have the plane nd3, cuts off below 40 degrees unless you wrap a hot pack around it. Killed a bobcat with it last Monday night. I like it because I can pan it out to a soft halo type of light, or zoom it down and see well at 300 through a Leupold. The other night I just caught a flash of a eye, zoomed in on the spot and could see the cat just setting there with his eyes shut, or barely cracked. A brighter light would have spooked him. If I had to do it over, I'd buy the sub-zero. Unless you need to shoot 600 yards don't buy the 40 or 50, too big and bulky. You can even zoom it down and point and shoot with it, kind-a fun with a AR. I killed a skunk with it at 283 yards about a month ago, and skunks are never still!