I tried the Luminocks and didn't like them. I guess they would be OK if you tuned and sighted your bow up with them because they are much heavier than a standard nock. I found that if you shoot past 30 yards with them after being sighted in with a std nock, you will hit substantially higher. I am assuming this is because you altered the %FOC which alters your arrow flight.
For the past 2 years I've used Nockturnals. They are plenty bright (I use both green and red). And because they are only about 8 grs heavier than std nocks, I have found that there is no significant difference in arrow flight out to 70 yds.