Had a lot of success with kessils. A lot of it depends on what you are trying to grow, how deep your tank is and how high the light is from the water line.
I used mostly the A350 and A360 Narrow lights on a 26” deep tank. I ran them at 100% intensity at either 9”, or 11” off the water line. Things grew and colored up nicely. LPS and softies don’t need that kind of intensity, and I think the lights longevity would probably be better running it around 80-90” intensity, however they lasted for over 4 years at 100% and haven’t crapped out yet.
I did run two wide A360’s in the back area of the tank and had success with SPS, however they were not very deep. Only 8-10” under water. They were also run at 100%. LPS did well on the bottom as did softies under the wides. LPS also did ok under the Narrow lights on the bottom, but tended to do better on the edges of the light, and not directly under it.
I think you would be fine to bump it up to 80% intensity and see how it goes. If anything I would go up, not down. Never seen a coral actually “burn” from my lights. However they do show stress if you take them out of tank with less light, and throw it directly under an intense LED. I always dropped corals on the bottom for a day or two, and then moved them up until they were where I wanted them.
Hope that helps. If you don’t have a tank journal, you should start one. Best part about this hobby is sharing with others that know how much work / effort it can take, and appreciate even the smallest of success’.
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