I was at Irv's camp a week ago and he showed me the clip on light he got at Walmart. I purchased one for my last evening sit. Was in a lock-on and it clamped to it perfectly. More than adequate light. I turned it on just at dark as I didn't want to take the chance of spooking any critters that might come in. It's a white light by the way. Didn't have any hog action but a coon and possum did come in to partake of the available victuals. Both were oblivious to the light and are now oblivious to everything.
Don't think I'd want a bow mounted light as in the dark I'd want to see the point of impact and that could be problematic upon release because of the bow movement.
Hunting hogs at night is more than fun.