Just remember that it is not all about par. MH's produce a full spectrum lighting that is impossible with LED's. I have a 180 with acropora all over my tank and am getting great growth and color. I'm using 3 Reef Brite mh/led pendants 13 inches above the top trim... 36 inches from the bottom of the tank.... no problem with growth or color. A standard 180g.
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Back to halides and loving it!
Current Tank Info: 180g sps dom, 40b sump, Reeflo Dart, Apex, Aquamaxx co2, Reefbrite mh/led pendants w/14k twinarcs, Kore 5th doser, Tunze ATO, Ranco controlling 800 watt Finnex tube, 2 Maxpect Gyre 150XF with Ice Cap Controllers and battery backup, Bean Animal drain
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