I have used lumenocks, and really like what they do. Don't seem to negatively influence accuracy either. The only issue I had was they worked great on some arrows and not on others. That got me to thinking maybe the nock end of my arrows were out of square so I slapped them in the lathe at work and faced them off (the nock end of my arrows that is). Now they work great in any arrow I stick them in. I guess the shop that cut my arrows had their saw a little out of square or something.

My favorite is pig hunting at night with them. They just make life so much easier in that scenario.