Personally, Anytime I try SPS with Kessil LED's they Loose all their Color and go Brown.
They do not Die and Do Grow but they loose all their Color.
Kessil are Great for Softies and LPS as those Corals seem to Love them.
But all my SPS and Chalices are Lit with T5's.
Chalices always Die when I try them under LED too.