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post #41 of (permalink) Old 01-17-2012, 08:02 PM
galabar
Planted Tank Enthusiast
 
Join Date: Oct 2011
Location: Bellevue, WA
Posts: 860
Quote:
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.
Quote:
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?

My 40 gallon breeder (and 20 gallon long): http://www.youtube.com/watch?v=4ta07C0y0nk
My 10 gallon with PAR30 LED: http://www.youtube.com/watch?v=8rbms5asKmA
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