1. Photosynthetic Active Radiation (PAR)

    Photosynthetic Active Radiation (PAR)
    What it is, and Why it Matters Photosynthetically Active Radiation (PAR) refers to one way of measuring the range of light wavelengths (400–700 nanometers ) that can be used for photosynthesis (see absorption range for photosynthesis chart above). This range covers the visible spectrum of light, which includes red (700–635 nm), orange (635–590 nm), yellow (590–560 nm), green (560–490 nm...

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