RE: lumenock
I am looking at Tracers for $18 ON EBAYfor two plus two practice grade nocks! They turn on/off with a magnet that mounts to your riser. They can also be programmed to stay off for practicing and in the off season!
PLUS great customer service, I had one not work for me when I removed it fom the arrow after a season and they replaced it plus another one for free!!
ohhhh and if you look harder I am sure you can find them at a better price?!?