A lot of PAR is above the 400 range in my mind too, now that you say it. But I am impressed with the Radion XR15PRO's and the PAR output, especially at 100%, they are powerful little fixture. The addition of a 4th may be necessary as I fill in the tank and things start growing in. I certainly would like to have MORE PAR available, but the real question is, is it needed? My SPS all seem very happy, have good colour, acceptable growth and don't seem short of light. Coral placement is a little more important given there are some lower PAR areas in the back of the tank, but I dont see that as an issue right now. Maybe a T5 or two would bump PAR, growth and colour better than a 4th Radion?
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