My tank got a MAJOR shock going from LED to halides. I am up to like 3 hours a day on the halides after almost 3 months. I could go faster but my tank is LPS dominated and they need serious time to adapt back to 300+ PAR. My acros are absolutely loving the halides. The growth on a couple pieces is getting back to what I remember when the hobby was in a much better place. I see new growth daily right now on a couple pieces.
It's not just the corals that need to adapt either. It is EVERYTHING in our tanks. Down to micro plankton, pods, and everything in between. Light gets to places it never was before. Takes time for the system to get back in balance. I am loving it to be honest!