I was running mine at 80% for a few weeks and after speaking with the Kessil technical support guru he recommended ramping to 100% at 30 minute increments over a few weeks to acclimate the corals. So far, I'm at 100% for two hours with no ill effects with plans to stretch that over four hours. I read online from other Kessil customers that they had bleaching at 100%, so I was a bit worried to give it a try. I'm also using the highest setting for spectrum which is pretty white and close to a halide 10k bulb.
What's the depth of your tank and how high did you mount the Kessils? Mine are 7" over the water and the frag shelf is 10" below the water. Evidently, with them only 7" over the water the spread is around 18" per the Kessil tech support. They couldn't provide me with any par values, however.
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