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post #2 of (permalink) Old 01-03-2013, 06:07 AM
Jeffww
Planted Tank Guru
 
Join Date: Aug 2010
Location: Houston
Posts: 2,261
What's the point of knowing through-air par. We already have a decent idea of what the PAR on most bulbs should be without water. It's harder to work with underwater stuff.
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