OSA's Digital Library

Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 68, Iss. 7 — Jul. 1, 1978
  • pp: 949–952

Luminance-brightness comparisons of LED alpha-numeric sources at suprathreshold levels

Robert L. Booker  »View Author Affiliations

JOSA, Vol. 68, Issue 7, pp. 949-952 (1978)

View Full Text Article

Acrobat PDF (568 KB)

Browse Journals / Lookup Meetings

Browse by Journal and Year


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools



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 V(λ) function and brightness as perceived visually

© 1978 Optical Society of America

Robert L. Booker, "Luminance-brightness comparisons of LED alpha-numeric sources at suprathreshold levels," J. Opt. Soc. Am. 68, 949-952 (1978)

Sort:  Author  |  Year  |  Journal  |  Reset


  1. G. Wyszecki and W. S. Stiles, Color Science (Wiley, New York, 1967).
  2. CIE publication No. 17, International Lighting Vocabulary, 3rd ed. (1970).
  3. Y. Le Grand, Light, Colour and Vision, 2nd ed. (Chapman and Hall, London, 1968).
  4. D. L. MacAdam, "Loci of constant hue and brightness determined with various surrounding colors," J. Opt. Soc. Am. 40, 589–595 (1950).
  5. R. E. Harrington, "Effect of color temperature on apparent brightness," J. Opt. Soc. Am. 44, 113–116 (1954).
  6. A. Chapanis and R. M. Halsey, "Luminance of equally bright colors," J. Opt. Soc. Am. 45, 1–6 (1955).
  7. W. E. K. Middleton and H. S. T. Gottfried, "Apparent Intensities of Colored Signal Lights," Illum. Eng. 52, 192–196 (1957).
  8. E.J. Breneman, "Dependence of luminance required for constant brightness upon chromaticity and chromatic adaptation, J. Opt. Soc. Am. 48, 228–232 (1958).
  9. C. L. Sanders and G. Wyszecki, "Correlate for lightness in terms of CIE tristimulus values. I.," J. Opt. Soc. Am. 47, 398–404 (1957).
  10. G. Wyszecki and C. L. Sanders, "Correlate for lightness in terms of CIE tristimulus values. II.," J. Opt. Soc. Am. 47, 840–842 (1957).
  11. C. L. Sanders and G. Wyszecki, "L/Y ratios in terms of CIE-chromaticity coordinates," J. Opt. Soc. Am. 48, 389–392 (1958).
  12. G. Wyszecki, "Correlate for lightness in terms of CIE chromaticity coordinates and luminance reflectance," J. Opt. Soc. Am. 57, 254–257 (1967).
  13. C. L. Sanders and G. Wyszecki, "Correlate for Brightness in Terms of CIE Color Matching Data," Compte Rendu, CIE, Vienna, 221–230 (1963).
  14. P. Kowaliski, "Equivalent luminances of colors," J. Opt. Soc. Am. 59, 125–130 (1969).
  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.
  19. 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).
  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).

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited