Im going by your words of "personal experience" meaning you actually had data from your own experiment. Thanks for the link.
I have 10 years of experience running setups open air and in ATI fixtures for Acropora dominant systems. I believe I have a pretty good handle on loss of spectrum over time with what I use. I've done numerous par tests over my own system.
I think it's working fairly well......the corals color and growth can tell a lot more than raw par numbers and spectral analysis. Taking pictures helps a lot as well.
https://www.reef2reef.com/threads/big-e-rimless-80g-sps.206607/
Look, all I'm saying is you have to be aware of what kind of results you're looking for and make sure when you're testing something you run it the way it was designed and recommended by the manufacturer.
Seriously, read that thread link I posted above on ATI fixtures. There's also a ton of factual data out there if someone cares to search for it.
I don't want to sidetrack this thread..........if you want more questions on how I do things I'm happy to answer questions on my tank thread.