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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)
http://dx.doi.org/10.1364/JOSA.68.000949


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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 V(λ) function and brightness as perceived visually

© 1978 Optical Society of America

Citation
Robert L. Booker, "Luminance-brightness comparisons of LED alpha-numeric sources at suprathreshold levels," J. Opt. Soc. Am. 68, 949-952 (1978)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-68-7-949

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