Another point to note is the higher the Kelvin the lower the PAR (generally). If you don't want light demanding corals, then be careful your lights aren't too powerful. My tank is 24" deep, and I can't keep my LPS any higher than the sand or they will bleach form too much light. My lights are 2x250w DE with 20,000K low quality bulbs (I'm trying to keep my PAR down so the LPS are happier!).
If you're happy with lower light SPS (Montis, Digis, deepwater Acros) and lower light clams (Squamosa & Derasa) then you may prefer to have T5HO lamps instead of MH or lower watt halides (like 150s). I'm assuming your 75 gallon tank is 21" deep.
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~ Mindy
SPS fanatic.
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