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Old 01-27-2013, 10:37 PM   #291
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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
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Old 01-27-2013, 10:55 PM   #292
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This is what Logan From Reef Breeders had to say!!
With 90 degree optics, par is about 280 at 24" down, 1300 just below the surface.
HOPE THIS HELPED !!!
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Old 01-27-2013, 10:56 PM   #293
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Sorry didn't know it sent the first time !!
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Old 01-27-2013, 11:07 PM   #294
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Quote:
Originally Posted by Robbiesamp View Post
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
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Old 01-27-2013, 11:16 PM   #295
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I'm sorry I don't understand what you are trying to get over! Sorry I just don't get it haha ??
Will you tell me in other words ?
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Old 01-27-2013, 11:20 PM   #296
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what I was trying to say is that by using 200W of LED, it only achieve almost the same amount of PAR as a 72W. That is what concerns me. spending almost 3 times the energy but getting the same result.
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Old 01-27-2013, 11:29 PM   #297
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Ok I get it so what toils you recommend for me to do ?? And thanks for the heads up
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Old 01-28-2013, 08:03 AM   #298
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Why does nobody look at CRI (color rendering index) as a measurement? Seems to me for photosynthesis in coral and needing a full spectrum of color this number would be just as important as par/ pur.
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Old 01-28-2013, 08:05 AM   #299
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Yea that's very true !!!
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Old 01-28-2013, 10:47 AM   #300
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It doesn't matter what color you are throwing at a coral if there isn't enough PAR. PAR= Photosynthetically Active Radiation. This IS the measurement of the right color for growing photosynthetic creatures.
Photosynthetically active radiation - Wikipedia, the free encyclopedia
I believe color rendering index to be a perception of color- what you see with the naked eye.
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