Abstract

Colorimetric specifications are given for Wratten light filters, including the tristimulus values, trichromatic coordinates, dominant wave-lengths, purity, and luminous transmittance for ICI illuminants A and C and for an artificial daylight produced by the use of a Wratten filter. These data are based on the spectral transmittance values published in the seventeenth edition (1944) of the booklet entitled “Wratten Light Filters.” Wave-lengths for thirty selected ordinates and for supplementary ordinates are given for colorimetric computations involving the artificial daylight source, which consists of a tungsten filament lamp operated at a color temperature of 2360°K, the light from which is passed through a Wratten filter No. 78.

© 1945 Optical Society of America

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References

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  1. “Quantitative Data and Methods for Colorimetry,” J. Opt. Soc. Am. 34, 648–656 (1944).

1944 (1)

“Quantitative Data and Methods for Colorimetry,” J. Opt. Soc. Am. 34, 648–656 (1944).

J. Opt. Soc. Am. (1)

“Quantitative Data and Methods for Colorimetry,” J. Opt. Soc. Am. 34, 648–656 (1944).

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Figures (2)

Tables (3)

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Table I Colorimetric specifications of Wratten light filters.

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Table II Wave-lengths for selected ordinates. Illuminant: 2360°K lamp with Wratten filter No. 78.

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Table III Wave-lengths for supplementary ordinates. Illuminant: 2360°K lamp with Wratten filter No. 78.