My vote would be for 2x250W bulbs. If you want mad growth, put some quality 10k bulbs in there and supplement with T5 actinics or blue+ bulbs. If you want good growth at lower electricity usage, just use 14k MH bulbs such as Hamiltons or Ushios and don't run actinics.
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Custom electronics purveyor. blueAcro.com
Current Tank Info: 90g SPS+mixed reef (10 yrs): LEDBrick LEDs, 40g custom sump, Ca reactor, chiller, Vortech, lots of custom electronics
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