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I have to disagree with Brandon here.
Higher light corals reach saturation at around 23000 lux. But the really shallow water corals live at light levels exceeding 50000 lux for a large part of the day.
A radium 20000K 400 watt bulb achieves about 50000 lux 6 inches below the bulb (basically at the water surface)
At 6 inches below the water the light will have dropped to about 20000 lux. This is good for most of the shallow water sps and the others will be kept a few inches lower or more.
John
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Frederick Bastiat
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