Photosynthetic Active Radiation

What is PAR? Why Do Grow Light Companies Brag about how much PAR Their Led Grow Light has?

Photosynthetic Active Radiation (PAR) designates the spectrum or range of colors of light from 400 to 700 nanometers that plants are able to use for photosynthesis. PAR measurements are usually expressed as photosynthetic photon flux density (PPFD) in units of μmol m-2s-1 — how many micromoles of photons (602,214,150,000,000,000 photons) within the PAR wavelengths of 400nm-700nm that go through 1-square-meter each second, though most devices that measure PAR do it only at a single point, rather than over a whole square meter.

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