My tank is a 90g 48lx24dx18h and I was running the Aquamedic 2x250w MH with 2x54w T5s. I just recently changed over to two Hydras with the Director controller. So far I haven't taken my settings down from the default 80% for mid-day and I haven't seen any bleaching, tissue recession, etc. Could it be because my previous lighting was so strong? Even at 80% the light from the Hydras don't come close to my MH fixture in terms of visible light.
I'd be interested in hearing what settings people with similar tank configurations are using. I have a mixed reef with a few LPS, SPS, softies, etc. Some photosynthetic anemones etc.
Also I've got my weather settings set to Umhlanga Rocks, Kwazulu Natal. A coastal resort in South Africa that is known for its reefs.