Red radiation according to "ISO" (610-760 nm) or as commonly defined in plant photobiology, "Smith10" (655-665 nm), "Smith20" (650-670 nm), "Inada" (600-700 nm), "Warrington" (625-675 nm), and "Sellaro" (620-680 nm). No weighting applied.

Red(std = "ISO")



a character string, "ISO", "Smith10", "Smith20", "Inada", "Warrington", "Sellaro", "RS", or for Landsat imagers "LandsatRBV", etc.


a waveband object wavelength defining a wavelength range.


Aphalo, P. J., Albert, A., Björn, L. O., McLeod, A. R., Robson, T. M., Rosenqvist, E. (Eds.). (2012). Beyond the Visible: A handbook of best practice in plant UV photobiology (1st ed., p. xxx + 174). Helsinki: University of Helsinki, Department of Biosciences, Division of Plant Biology. ISBN 978-952-10-8363-1 (PDF), 978-952-10-8362-4 (paperback). Open access PDF download available at

ISO (2007) Space environment (natural and artificial) - Process for determining solar irradiances. ISO Standard 21348. ISO, Geneva.

Murakami, K., Aiga I. (1994) Red/Far-red photon flux ratio used as an index number for morphological control of plant growth under artificial lighting conditions. Proc. Int. Symp. Artificial Lighting, Acta Horticulturae, 418, ISHS 1997.

Sellaro, R., Crepy, M., Trupkin, S. A., Karayekov, E., Buchovsky, A. S., Rossi, C., & Casal, J. J. (2010). Cryptochrome as a sensor of the blue/green ratio of natural radiation in Arabidopsis. Plant physiology, 154(1), 401-409. doi:10.1104/pp.110.160820

Smith, H. (1982) Light quality, photoperception and plant strategy. Annual Review of Plant Physiology, 33:481-518.

See also


Other unweighted wavebands: Blue, Far_red, Green, IR, Orange, Purple, UVA, UVB, UVC, UV, VIS, Yellow


#> Red.ISO #> low (nm) 610 #> high (nm) 760 #> weighted none
#> Red.ISO #> low (nm) 610 #> high (nm) 760 #> weighted none
#> Warning: The definition of 'Smith' defaults to 'Smith10', to restore old behaviour use 'Smith20'.
#> Red.Smith10 #> low (nm) 655 #> high (nm) 665 #> weighted none
#> Red.Sellaro #> low (nm) 620 #> high (nm) 680 #> weighted none