I am in the process of comparing the lighted nocks for crossbows from eight different manufacturers.
Some pretty interesting stuff as far as brightness, battery life, ease of installation, easy off, durability etc..Here are some pictures of 3 red LED nocks and 3 green LED nocks. One nock in each picture is much brighter than the others. That does not necessarily mean its battery won't last as long as the others either.
I support all hunters, regardless of weapon or technique!