I tried the lumenoks and they worked well and were plenty bright enough,but shot the first one at a doe last weekend a pass thru that after hitting the ground the nock popped out of the arrow and was gone because they don't stay lit unless they maintain contact with the arrow shaft! $15 bucks gone,Kinda bad design because everytime you shoot them you have to wiggle them back to turn them off and after awhile they start getting loose!
I think I may give the nockturnals a try from the way they look and turn off if the did happen to come out of the arrow they will stay lit so you can find them!