Photosynthetically Active Radiation or PAR means the wavelength that plants use to create energy. Different plants thrive with different varieties of light, so it’s best to include as many wavelengths that emit PAR as possible. More Information please see https://cannabis.ledlight.cc/the_best_led_grow_lights_for_cannabis_417.html?ref=answer
From WikiPedia, about “Grow Light” Term, Lux and Lumens are commonly used to measure light levels, but they are Photometric units which measure the intensity of light as perceived by the human eye.
Biologists often measure the amount of Photosynthetically active readiation(PAR) received by a plant. PAR designates the spectral range of solar radiation from 400 to 700 nanometers which corresponds to the spectral range that photosynthetic organisms are able to use in the process of Photosynthesis.
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