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Okay so I guess I will play around with it until the corals react accordingly.Hard to give an exact number. Tank size, coral placement, and height above water are all going to factor in. Your best bet is to get the spectrum you like and start out with low intensities and slowly ramp it up. If your corals start looking upset final it back and fine tune it from there. Other option would be to rent or purchase a par meter and measure your par output