Quote:
Originally Posted by On3Tim3OnLy
WTF
Though given, it is irrelevent ! Lumens are for Humans not plants ! Lumens measure how we see light. Our eyes prefer green light. Green light has the most Lumens, Red and Blue the least. Most fluorescent lamps are made to look bright for humans by adding huge spikes of greeny yellow light.
Lumens only measure how BRIGHT the light appears to us.
Lumens cannot measure light useful to plants
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This is true, and for that we have two other measures that are often not well understood. They are PAR (photosynthetically active radiation) and PUR (photosynthetically usable radiation). Lumens are, for the layperson, along with color temperature ratings, the easiest way to get at what we need, which is to duplicate sunlight.