I have a 2ft deep tank with I'm guessing the same Chinese leds and I run them 10in off the water at 100% white 100% blue. I know it sounds hight but after acclimating my corals slowly started at 50% and went up 25% per week. Now whenever I add new coral I will knock them back down to 50% and go through the same process. I don't think the lights need to be at 100% at all but it brightens the tank and corals have been growing well so I don't see why it too much. What kind of coral do you have? I have zoas, acros, hammer, candy cane, other sps
and random softies.