I thought you said this was a light question?? That's some heavy stuff your asking.. OK j/k Wattage isn't the only factor you have to consider when lighting. There is lumins (basically amount of light) and the light temperature (or colour of light) Another thing is you just changed the light levels your corals are accustomed to so they are adjusting. These are only the few things that popped into my head when I read your post, but I'm sure you will get more help shortly. There's some really light headed people around here who should get you all fixed up.
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