Things to watch for when changing lighting?

[Son Of Skyline]

I'm thinking of swapping my 400w Radiums back to 250w Iwasakis for awhile to see if I can increase growth rates. Is there anything to watch out for, or little things to do to prevent any unforseen problems? Should I decrease my photoperiod an hour or so to acclimate the corals back to the higher lighting? Or am I just being paranoid and have nothing to worry about or nothing I need to change?

Thanks in advance!