I've read the emperor aquatics recommended flowrate and their recommendation of 180,000 micro watts to kill protozoan such as ich. I've looked at AquaUVs ratings to kill protozoan and they have it at 90,000 microwatts. Since I'm using their unit, I went with their recommendation. I called just to confirm for my tank size and the tech recommended 1,000-1,200 gph so that's what I'll run with. Sadly, neither one of them supply research to backup their recommendations so I'll have to trust AquaUVs recommendation for now until we get some results from Timfish's veterinarian friend.
I don't think we can be conclusive of anything yet as to its ability or lack of ability to destroy pathogens and parasites yet. You'd be surprised too how many tanks actually use UV. Take a look a couple of the bigger reef setups on the larger forums and read their equipment list. You'd be a little surprised at the number that run UV. While that is not conclusive in itself, I typically aim to do the same things that successful tanks do... especially if I'm trying to mimic them.
Anyways, I don't think there will be tangible results from my experiment. There's not enough control over the experiment nor do I have the proper equipment to pull any usable data, like protozoan/bacteria counts, so my results will be mostly anecdotal. It's still fun to do though so I'll share my thoughts.