What I would honestly do and is better IMO
is get some window screen.. Enought to do 3 or 4 layers over the top of the tank.. Put the lights down where they are going to be and set the length that they are going to be ran.. The window screen will shade the tank... Every few days/Week I would remove one layer... If you notice any adverse reactions add a layer back.. I have successfully went from 330w PC
lights to 2x250w MH
and 2x55w PC
actinics using this method without any issues... The corals get the full light without any breaks or being blasted with alot of light for a short period of time.. I believe A. Calfo came up with this method as a better method for photo acclimation...