The Planted Tank Forum - View Single Post - T8->leds, what explains the difference?
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Old 11-28-2012, 03:07 PM   #3
Steve001
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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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