All LED fixtures are different in every way. It depends on how high they are over your tank, how deep your tank is, what you are keeping in the tank, and personal visual preference. If the corals are used to LED light, then you do not need to worry too much about an acclimation process. I would just watch the corals. You can tell normally where they stand on how much light they are getting. There are guidelines everywhere, but I would start no higher then 50%. In my experience, and from what I have read from others on here, when it comes to a good fixture, most never go over 80% on the predominant color. As example, my blue maxes at 80%, white maxes at 40% and multi color at 50%. But that is what works for me, my fixture and my corals where they are placed. Start low and work your way up and enjoy finding the sweet spot for your tank.