I tried luminocks and tracers and didn't care for them. IMO they were too heavy and changed the %FOC which actually caused the arrows to hit higher than an normal nock. This year I tried the nocturnal lighted nock and these are only about 7 gr heavier than the regular nock as opposed to 20 gr heavier for the others. I've seen no significant change in point of impact out to 40 yds with these nocks.