Abstract

An experiment was conducted in which observers adjusted the luminance of a 2856 K white comparison source to appear equally as bright as a red, yellow, or yellowish-green LED alpha-numeric source. Although the present CIE photometric system predicts brightness-luminance ratios of 1.0, the ratios obtained in this experiment, for the mean observer, were 1.13 for the yellowish-green, 1.28 for the yellow, and 2.54 for the red. These results demonstrate that there can be substantial differences between photometric luminance based on the <i>V</i>(λ) function and brightness as perceived visually

© 1978 Optical Society of America

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  1. G. Wyszecki and W. S. Stiles, Color Science (Wiley, New York, 1967).
  2. CIE publication No. 17, International Lighting Vocabulary, 3rd ed. (1970).
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  15. D. H. Alman, "Errors of the Standard Photometric System When Measuring the Brightness of General Illumination Light Sources," J. Illum. Eng. Soc. 7, 55–62 (1977).
  16. NBS and NRC-Canada are involved in a cooperative effort to compare photometric luminance with perceived brightness. The present work is a companion project to the work by Alman at NRC. Future work at NRC will use sources 2° or larger, while NBS will concentrate on sources 1° or smaller.
  17. A. C. Wall, "The Photometry of Colored Light," Illum. Eng. 62, 239 (1967).
  18. FASCAL, Optical Radiation News No. 18, Natl. Bur. Stand., November 1976.
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  20. W. W. Coblentz and W. B. Emerson, "Relative Sensibility of the Average Eye to Light of Different Colors and Some Practical Applications to Radiation Problems," Bull. Bur. Stand. 14, 161 (1918).

1977 (1)

D. H. Alman, "Errors of the Standard Photometric System When Measuring the Brightness of General Illumination Light Sources," J. Illum. Eng. Soc. 7, 55–62 (1977).

1969 (1)

1967 (2)

1958 (2)

1957 (3)

1955 (1)

1954 (1)

1950 (1)

1918 (1)

W. W. Coblentz and W. B. Emerson, "Relative Sensibility of the Average Eye to Light of Different Colors and Some Practical Applications to Radiation Problems," Bull. Bur. Stand. 14, 161 (1918).

1912 (1)

H. E. Ives, "Studies in the Photometry of Lights of Different Colors. I. Spectral Luminosity Curves Obtained by the Equality of Brightness Photometer and the Flicker Photometer Under Similar Conditions," Philos. Mag. 24, No. 6, 149 (1912).

Alman, D. H.

D. H. Alman, "Errors of the Standard Photometric System When Measuring the Brightness of General Illumination Light Sources," J. Illum. Eng. Soc. 7, 55–62 (1977).

Breneman, E.J.

Chapanis, A.

Coblentz, W. W.

W. W. Coblentz and W. B. Emerson, "Relative Sensibility of the Average Eye to Light of Different Colors and Some Practical Applications to Radiation Problems," Bull. Bur. Stand. 14, 161 (1918).

Emerson, W. B.

W. W. Coblentz and W. B. Emerson, "Relative Sensibility of the Average Eye to Light of Different Colors and Some Practical Applications to Radiation Problems," Bull. Bur. Stand. 14, 161 (1918).

Gottfried, H. S. T.

W. E. K. Middleton and H. S. T. Gottfried, "Apparent Intensities of Colored Signal Lights," Illum. Eng. 52, 192–196 (1957).

Grand, Y. Le

Y. Le Grand, Light, Colour and Vision, 2nd ed. (Chapman and Hall, London, 1968).

Halsey, R. M.

Harrington, R. E.

Ives, H. E.

H. E. Ives, "Studies in the Photometry of Lights of Different Colors. I. Spectral Luminosity Curves Obtained by the Equality of Brightness Photometer and the Flicker Photometer Under Similar Conditions," Philos. Mag. 24, No. 6, 149 (1912).

Kowaliski, P.

MacAdam, D. L.

Middleton, W. E. K.

W. E. K. Middleton and H. S. T. Gottfried, "Apparent Intensities of Colored Signal Lights," Illum. Eng. 52, 192–196 (1957).

Sanders, C. L.

Stiles, W. S.

G. Wyszecki and W. S. Stiles, Color Science (Wiley, New York, 1967).

Wall, A. C.

A. C. Wall, "The Photometry of Colored Light," Illum. Eng. 62, 239 (1967).

Wyszecki, G.

Bull. Bur. Stand. (1)

W. W. Coblentz and W. B. Emerson, "Relative Sensibility of the Average Eye to Light of Different Colors and Some Practical Applications to Radiation Problems," Bull. Bur. Stand. 14, 161 (1918).

Illum. Eng. (2)

A. C. Wall, "The Photometry of Colored Light," Illum. Eng. 62, 239 (1967).

W. E. K. Middleton and H. S. T. Gottfried, "Apparent Intensities of Colored Signal Lights," Illum. Eng. 52, 192–196 (1957).

J. Illum. Eng. Soc. (1)

D. H. Alman, "Errors of the Standard Photometric System When Measuring the Brightness of General Illumination Light Sources," J. Illum. Eng. Soc. 7, 55–62 (1977).

J. Opt. Soc. Am. (9)

Philos. Mag. (1)

H. E. Ives, "Studies in the Photometry of Lights of Different Colors. I. Spectral Luminosity Curves Obtained by the Equality of Brightness Photometer and the Flicker Photometer Under Similar Conditions," Philos. Mag. 24, No. 6, 149 (1912).

Other (6)

NBS and NRC-Canada are involved in a cooperative effort to compare photometric luminance with perceived brightness. The present work is a companion project to the work by Alman at NRC. Future work at NRC will use sources 2° or larger, while NBS will concentrate on sources 1° or smaller.

FASCAL, Optical Radiation News No. 18, Natl. Bur. Stand., November 1976.

G. Wyszecki and W. S. Stiles, Color Science (Wiley, New York, 1967).

CIE publication No. 17, International Lighting Vocabulary, 3rd ed. (1970).

Y. Le Grand, Light, Colour and Vision, 2nd ed. (Chapman and Hall, London, 1968).

C. L. Sanders and G. Wyszecki, "Correlate for Brightness in Terms of CIE Color Matching Data," Compte Rendu, CIE, Vienna, 221–230 (1963).

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