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post #41 of (permalink) Old 01-17-2012, 07:02 PM
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Join Date: Oct 2011
Location: Bellevue, WA
Posts: 871
Originally Posted by galabar View Post
Would it be possible to roughly estimate this by using green and yellow filters? If you were to get some photographic filters that block the green and yellow light that aren't all that useful, you might get a better idea of the PUR values of these LEDs.
Originally Posted by samamorgan View Post
That's an interesting idea. I honestly don't know if that would work or not, but it sounds reasonable. My thought is: if it was really that simple, wouldnt the manufacturers already have done this to their sensors?
Does anyone have a PAR meter and a few photographic filters? Maybe put a green filter over the PAR meter probe and see what they get with various light sources?

Marineland 26 bow front:

40 gallon breeder (and 20 gallon long):
10 gallon with PAR30 LED:
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