LED Grow Lights for Cannabis: Understanding PAR and PPFD

There are two key metrics to understand when it comes to LED grow lights, which have recently become a favorite with growers. These are PAR and PPFD. PAR stands for Photosynthetically Active Radiation, which refers to the spectrum of light that plants use for photosynthesis, specifically wavelengths between 400-700nm. PPFD stands for Photosynthetic Photon Flux Density, which refers to the amount of PAR falling in a given area per second....

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