yes, i run the mixed reef setting from coral labs, and it automatically sets the lights at 50%, at that intensity I bleached/killed a lot of my corals!
I cranked it all the way down to 20% to stop the shock. I've been slowly moving back up, but am only at 30% now, and am so scared to go higher after the damage these lights did to my corals.
Don't be fooled, these LEds pump out serious PAR.