I took a primos red spotlight that clips on the scope, took the 6v light bulb out and replaced it with an H3 12v motorcycle bulb. I then put a12v rechargeable feeder battery in a fanny pack to power it. I also added a cigarette lighter adapter so that I could charge and/or operate it in my truck.
It was great for hunting, super bright but with the red lens critters never reacted to it. The battery would last a couple of hunts in between charges. Of course it's turned on only intermittently.
Half-moonlight at your back can allow you to see fairly well. The time between half moon and quarter moon was pretty fruitful night hunting, at least for me.