I'm also upgrading lighting on part of my tank from 175w MH to 250w HQI MH. Can't really give you any specific info but I can suggest to start with a very limited photo period on new lighting and increase say 1 hr/day +/-. I noticed an acro in my tank almost bleach ( lost a lot of color ) just by removing an overhanging monti cap. I suggest waiting for the smarter guys on the board to reply or just use patience and bring up the photo period very slowly if you have many light sensitive corals.
Kari
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