Quote:
Originally Posted by Atomic081
My light is 18" off the surface of the water. 12 inch deep tank. (Frag tank) .
Full blast both blue and white I was getting 400 par at the surface and 200 par 12 inches down.
Half power I was getting 250 par at the surface and 125 at the bottom (12" deep)
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Those are pretty good orientative values. You have those lights up and running since January? How are the corals doing? I think the way corals behave/grow is the best PAR meter, more important the best PUR (Photosynthetically Useable Radiation) meter.