Intensity mainly affects the overall yield of your crop. The quality of the spectrum mainly affects the quality of the plants structure, tastes and/or smells.
Red/Blue Ratio is to check the PPFD ratio between Red part (600-700nm) and Blue part (400-499nm).
Photosynthetic Active Radiation (PAR) was derived from the McCree Curve. It is a total count of light energy (in photons) between 400nm to 700nm. This represents the area of light that plants use for photosynthesis, or to grow
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