there is a lot more to growth then par but for sps the range is 500-200. some sps need a but more some can do with less. sometimes growth will get so out of control that the large corals will shade itself out or other corals. just because someone has a lot of light intensity doesnt mean good growth. ia hev seen tanks with powercompacts grow coral very well and tanks with mh not grow corals at all. But to answer your question 200-500 is the sweet spot for par.
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