I went with a surefire tactical 1" tube flash light MSRP 100 I paid 25 on base from a discount bin. I matched it with a FAS-2 1" flashlight holder with a solar force pressure switch. I paid 30 for the mount switch and hardware but I bet its worth a lot more its a quality piece.
Works great for spotting rabbits at night through the scope.
I have had several lights and if I ever did it again I would go with an Infrared light and buy a night vision monocular and put it behind a night vision red dot. Just cause....