The Planted Tank Forum - View Single Post - T8->leds, what explains the difference?
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post #3 of (permalink) Old 11-28-2012, 03:07 PM
Wannabe Guru
Join Date: Feb 2011
Location: Baltimore Maryland
Posts: 1,701
Lumens aren't applicable because they refer to how bright a light looks to the human eye. What you need to look at is the photosynthetic active radiation (PAR) a source of light outputs. PAR is what matters to plants.
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