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Get/borrow a used MH reflector and shine your kessil up into it and turn the power up 5% to handle the drop. This has terrible aesthetic, but you will be amazed at how many different parts of your coral get hit. If we put a LumenMax Elite, for example, over a Kessil tank, there are lines of demarcation on every coral that look different instantly - like somebody drew on them with a marker where the light-line was.
If this thread is still active the next time that I got to one of the local shops, I will take some photos of a 180G lit with 3 kessils. They have mostly MBP&S that are in the 12 to 16 inch range and every single one of them is dead on the bottom. They really love to sell the Kessils and their typical line is that the death is perfectly normal.
Don't underestimate that larger colonies make light even less available in the middle than smaller ones. Personally, I think that you will have a different opinion of this when you have 6 to 8 inch colonies with hundreds of branches.