I've been using Nocturnal nocks for years. Before that another brand that worked on targets but NEVER on deer. Lumenocks. Nocturnal nocks have preformed perfectly for me for years. For the dude who went to Africa to bowhunt but couldn't afford a $10 nock. I'm sorry! lol No hard feelings but I wouldn't go hunting again without a lighted nock. To be clear with my back ground. I make my own laminated bows, strings, turkey fletching, do my own butchering and taxidermy, etc etc. But I feel strongly about the positive results of using a lighted nock.