After not hunting archery for a few years since I was injured I went out this year and performed poorly. I bought a new bow and I am switching to Carbon arrows.My Question is about the KNOCKS .I am looking at the new knocks that light up when fired. I lost a lot of Eyesight the lasy 10 years and This would be NEEDED for me. I was wondering if anyone can tell me the efects on shot placement and arrow flight?
Should I buy these knocks?? I won,t see the arrow in flight without them. J.Michael

From my limited experience, the lighted nocks have no effect on arrow flight out to 40 yards-the farthest I have shot with them.

None. Just paper tune your arrows when you get them assembled, just like you would any arrow. I recommend the NOCKTURNAL brand. (Mainly because I got a few for free)
Seriously though, the "pros" at my archery club have tried them all and seem to prefer this brand.

http://www.youtube.com/watch?v=wt9pUraM4u4