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Absorption Spectrum and Action Spectrum
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Photosynthetically Active Radiation (PAR) has the following range of wavelengthsPhotosynthetically active radiation (PAR) is the part of the solar spectrum that can be used by plants for photosynthesis.
It corresponds to the visible region of the spectrum, with wavelengths from 400 nm to 700 nm.
The chlorophylls absorb mainly in the blue (around 430-450 nm) and red (around 640-680 nm) regions of this range.
PAR makes up less than 50 percent of the incident solar radiation.
So the range of PAR is 400-700 nm.