NOCKturnals are slightly heavier, but they come with regular nocks for practice that weigh the same.. When you switch them over for hunting, there is absolutely NO CHANGE....
The Nockturnals weigh exactly the same as the vi-brake nocks that come with some of the Beman arrows. the is not really enough of a weight difference in any of them that you would notice a dramatic changed in your shots out to even about 40 yards. But if you are worried just use the real thing when you are practicing and do not shot at the same spot and you wont break them.
Correct. I was talking about your standard G or F nock as opposed to the vi-brake nocks which yes they weigh close or the same to most lighted nocks.
depends on the grain weight of the nock that isnt lighted. As a general the lighted nock is going to be heavier than a regular nock, but it may not be too serious. Grab a set of cheap grain weight scales from ebay and see if you can weigh the nocks you use and are considering