I wouldn't bother with 400s unless my tank was 36" deep or more. 250s are plenty of light for a 22" deep tank with 30" width for SPS provided you take into consideration the ballast/bulb PAR as well as choose a good quality reflector. I would suggest a reflector that spreads the light well to cover the length and width of your tank like a full-sized Lumenarc, Lumenmax or Lumenbrite. Using one of those reflectors and choosing a good bulb/ballast combo, I think you will do quite well with 3x250w.
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~ Mindy
SPS fanatic.
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