From: Legrad, Croatia
It is possible to get large numbers of kills with night fighters. I have had turns where the RAF have lost 121, 91 and 82 heavy bombers on raids to Berlin, although I cannot now remember how many of those are shot down by flak and how many by nightfighters.
It does seem to be rather random, the number of attacks are made. Some turns see night fighters make attacks every minute or two, some turns only a very few are made and there seems to be more than just the moonlight involved in this. I have no particular special tactics, just set large groups of nightfighters on patrol at around 20000 feet near the city which looks to be the target. The most attacks are always made while over the cities.
I tried that with no effect at all. Max RAF night losses in my game have been 30. Most of them due to heavy FLAK over and on the way to target. I really can not see any use of nightfighters. On the other way, RAF night intruders seems to not have similar problems. They just wait for my NFs to land and then shot them down. But maybe all of my pilots are blind and braindead...
So if anyone knows any nachtjagd tactic that actually works, please share your knowledge. Otherwise, nachtjagers are just a waste of effort, resources and pilots....