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Photosynthetically Active Radiation (PAR) values determine the growing strength of a light. PAR is expressed as Photosynthetic Photon Flux (PPF). PPF is the total light (photons) emitted by a light source each second.
PPF tells us how much PAR is emitted by a light source and is measured in micromoles per second (μMoles/second). Natural sunlight has a PAR value of 1200-1500 μMoles/second.