Go for LED
LED would be the best, if you can afford it. They're dimmable and have no waste heat. Go for the Vertex or the AquaIllumination models. 80 watts per foot on both, so you'd be consuming 160 watts maximum (probably running around 50% output, so make that 80 watts).
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180 gal tank, 50 gal sump, PM RFCa6 Ca Reactor, SWC Extreme 250 1A Cone Skimmer, Tunz Osmolator ATOF, Aquacontroller Apex, Aquaillumination Sol Super Blue 6 x 75w Units, Acros/Softies/LPS/Mushrooms/Zoos, Purple/Powder Blue/Yellow Tang/3xBlue Chromis/2xTomato Clown/Lawnmower Blenny
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