CIE Method of Assessing Daylight Simulators
Daylight simulator is a “device that provides spectral irradiance approximating that of a CIE standard daylight illuminant or CIE daylight illuminant, for visual appraisal or measurement of colours” .
Development of the CIE Methods of Assessing Daylight Simulators
Although for decades after the acceptance of the CIE system (1931), Illuminant C was accepted and widely used in colorimetry, the practical implementation of Source C was limited to special laboratory use. In 1963, the Colorimetry Committee of the CIE decided to supplement the then existing CIE illuminants A, B, and C by new illuminants more adequately representing phases of natural daylight. These new illuminants (D55, D65, and D75) were defined by a new approach suggested by Judd et al.  based on Simonds’  method of reducing experimental data to characteristic vectors (eigenvectors) and calculating the relative spectral power distribution of daylight of any desired correlated color temperature.
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