Definitions

far-red radiation

Far-red

Far-red light is light at the extreme red end of the visible spectrum, between red and infra-red light. Usually regarded as the region between 700 and 800 nm wavelength, it is dimly visible to some eyes. It is reflected or transmitted by plants because of the absorbance spectrum of chlorophyll, and it is perceived by the plant photoreceptor phytochrome.

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