I don't feel a big need to replace my factory nocks on any of mine, but I did buy a 3 pack of Nockturnal Preadator illuminated nocks for the bolts that I plan to use for hunting. My main logic behind that was for helping find the arrow after a pass through, or even as a possible locator if following a long blood trail.
I couldn't find these in red that I wanted, but the green is still pretty bright.
If that bear doesn't move on pretty soon, there isn't going to be much of a season. There's a young bear (probably about a year old) that has taken up residence and I have very few pics of anything but it the last week and a half.