I agree the green are a lot brighter but I can't believe you don't notice a difference shooting Nocturnals and Luminocks side by side.
There is a pretty big weight difference and at 30 yards the Luminock arrows hit about 4" higher at 30 yards for me. The Nockturnals arrows were so close as to not have a noticable difference from the standard nocks.

bronko: Never had one blow up on me (nor do I see how gluing something to the inside of a nock would cause it to blow up). However, if I don't roughen the inside of the nock sufficiently, the rod will slide out after a while. When that happens, I can hear it rattling.

It could possible be the material used to make the lighted nocks vs. those used for std nocks are different. Or possibly the one that blew up on me had a crack in it and the extra weight caused it to shatter upon release.
I know it was a harrowing experience. I thought I destroyed my bow.

I have been creating own for couple of years. Nothing like killing a buck just earlier even and seeing your Lighted Nocks up like ideal of achievement.