I’m running my lights on a 180G (24” deep tank) at 70% blues and 10% whites mounted in my canopy. I need to have a lot of par because it will be SPS dominant with some lps and softies. I’m getting 250-300 par at bottom and around 400-450 par at top of the rocks.
Now, with my previous tank (75G), I ran them at 95% blues and 10% whites. However, they were mounted at 12” high and I had no problems keeping all types of corals. I was getting similar par readings as my 180G. That’s why you abosolutely need to use a par meter to make sure.That’s crazy!
My old pic of 75G