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Far-red light is light at the extreme red end of the visible spectrum, just before infra-red light. Usually regarded as the region between 710 and 780nm wavelength, it is dimly visible to human eyes. It is largely reflected or transmitted by plants because of the absorbance spectrum of chlorophyll, and it is perceived by the plant photoreceptor phytochrome. However, some organisms can use it as a source of energy in photosynthesis.[1][2] Far-red light also is used for vision by certain organisms such as some species of deep-sea fishes[3][4] and mantis shrimp.

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  1. ^ Pettai, Hugo; Oja, Vello; Freiberg, Arvi; Laisk, Agu (2005). "Photosynthetic activity of far-red light in green plants". Biochimica et Biophysica Acta (BBA) - Bioenergetics. 1708 (3): 311–21. doi:10.1016/j.bbabio.2005.05.005. PMID 15950173.
  2. ^ Oquist, Gunnar (1969). "Adaptations in Pigment Composition and Photosynthesis by Far Red Radiation in Chlorella pyrenoidosa". Physiologia Plantarum. 22 (3): 516–528. doi:10.1111/j.1399-3054.1969.tb07406.x.
  3. ^ Douglas, R. H.; Partridge, J. C.; Dulai, K.; Hunt, D.; Mullineaux, C. W.; Tauber, A. Y.; Hynninen, P. H. (1998). "Dragon fish see using chlorophyll". Nature. 393 (6684): 423. Bibcode:1998Natur.393..423D. doi:10.1038/30871.
  4. ^ "Scientists Discover Unique Microbe In California's Largest Lake". ScienceDaily. 11 January 2005.

5. "Extensive remodeling of a cyanobacterial photosynthetic apparatus in far-red light" 2014 http://science.sciencemag.org/content/345/6202/1312