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If you would consider halides, I think 4 250watt fixtures in a square grid would work quite well. I'd place the reflectors perpendicular to the long side of the tank so each fixture is responsible for 36" of the length and 20" of the width. Should have no problem keeping LPS happy, even at the bottom of the tank.
For another non-LED alternative, a couple of ATI Sunpower 60" units would also light up your tank quite nicely, one for each side. You could also go a DIY route and make your own canopy with T5 retro kits and make a canopy with 12-14 60" T5s, which would also be more than enough for happy LPS corals. Would probably be one of the more economical options for lighting your tank.
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