Definitions
Illuminants having the same or nearly the same relative spectral power distributions as phases of daylight.
Description of Daylight Phases
Originally, CIE standardized three illuminants for colorimetric purposes, illuminants A, B, and C. Illuminant C was the illuminant to represent daylight. CIE also defined standard sources for these illuminants, and CIE standard source C was realized by using an incandescent lamp and some liquid filters. This source had, however, less radiation in the ultraviolet spectrum as natural daylight. With the increased use of optical brighteners, it became necessary to define daylight that came nearer to natural phases of daylight.
In the 1960s, the question how daylight power distributions of different correlated color temperatures could be calculated by a simple and explicit formula came to the front. The task was to determine relative spectral power distributions of daylight that could be measured on the surface of the Earth and was modified...
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References
Judd, D.B., Wyszecki, G., MacAdam, D.L.: Spectral distribution of typical daylight as a function of correlated color temperature. J. Opt. Soc. Am. 54, 1031–1040 (1964)
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Commission Internationale de l’Éclairage, CIE: Methods for re-defining CIE D illuminants. CIE 204 CIE Central Bureau, Vienna (2013)
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Commission Internationale de l’Éclairage, CIE, Joint ISO/CIE Standard: Colorimetry – Part 2: CIE Standard Illuminants for Colorimetry. CIE S 014-2/E:2006 / ISO 11664–2:2007(E) CIE Central Bureau, Vienna
Commission Internationale de l’Éclairage, CIE: Colorimetry, 3rd edn, CIE 15 CIE Central Bureau, Vienna (2004), Table T.1, pp. 30–32
Commission Internationale de l’Éclairage, CIE: Indoor Daylight Illuminants, 1st edn. CIE 184 CIE Central Bureau, Vienna (2009)
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Kránicz, B. (2015). Daylight Illuminants. In: Luo, R. (eds) Encyclopedia of Color Science and Technology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-27851-8_320-1
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DOI: https://doi.org/10.1007/978-3-642-27851-8_320-1
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