Originally Posted by Robbiesamp
With 90 degree optics, par is about 280 at 24" down, 1300 just below the surface.
This is from Logan With Reef Breeders
I hope this helps
So for 200W it gives you 280 at 24", that is kind of what I meant, here is a old PAR reading of the Zetlight 144W fixture, also using bridgelux and it was 90 degree or 120 degree lenses, but I forgot the exact optic being used. However, I am sure it is not 60 degree, cuz when I have 2 of the 72W, it covers my full 48" tank and each fixture is only 12 inches long.
To even compare it to the old 72W Zetlight fixture, it is
So which means that the 72W is almost equals to the PAR reading for reefbreeder's fixture.
The surface reading doesn't really mean much as
1) no one will place coral at surface
2)no coral in this world require anything over 700PAR. Even at 700 PAR, it is really small amount of SPS
that can actually use it. Most SPS
are 250 to 550.
Make sure that you understand that I am not trying to bash their fixture, as the 2 fixtures I used to compare are both discontinued. All I am saying is just to clarify what raise my concern when looking at a 32" 200W fixture