My 2 concerns on this are 1. Like Oldtimr said, the legality of it and 2. the weight. I know from experience that without using these to practice with you can't just install them and go hunting. If the weight is too much your arrow will be tail heavy and high higher than a standard nock. That is the reason I use Nockturnal lighted nocks. They are only 2 gr heavier than my standard nocks and there is no noticeable difference even at extended ranges.