I have a Cabelas VRL-1 Varmint Light mounted on my Savage Mark II TR 22LR https://bestoutdooritems.com/predator-hunting-lights-reviews/ It produces a lot of light and a lot of visibility for about 150-200 yards. It comes with two batteries (every few hours), a home and car charger, a green and red light bulb, as well as the necessary equipment to mount it to my scope or rail.It has a pressure button that you can velcro to the side of the rifle and activate the light while aiming. Check out this video how to properly use lights.