Hi Todd, I use a Clulite SL2 which mounts on top of the scope on my .17, or I can use it as a hand held from its battery pack with strap on the Mule ATV, or plug the unit into the cigarette lighter to use/charge from the Landy. Its very powerful indeed, about £90 If my memory serves me correctly, great lamp and very pleased with it. Clulite have a website and all their accessories are on there filters etc.