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Title: Development of the IES method for evaluating the color rendition of light sources

Abstract

We have developed a two-measure system for evaluating light sources’ color rendition that builds upon conceptual progress of numerous researchers over the last two decades. The system quantifies the color fidelity and color gamut (change in object chroma) of a light source in comparison to a reference illuminant. The calculations are based on a newly developed set of reflectance data from real samples uniformly distributed in color space (thereby fairly representing all colors) and in wavelength space (thereby precluding artificial optimization of the color rendition scores by spectral engineering). The color fidelity score Rf is an improved version of the CIE color rendering index. The color gamut score Rg is an improved version of the Gamut Area Index. In combination, they provide two complementary assessments to guide the optimization of future light sources. This method summarizes the findings of the Color Metric Task Group of the Illuminating Engineering Society of North America (IES). It is adopted in the upcoming IES TM-30-2015, and is proposed for consideration with the International Commission on Illumination (CIE).

Authors:
 [1];  [2];  [3];  [4];  [5]; ;  [6];  [3];  [7]
  1. Soraa Inc., Fremont CA (United States)
  2. Cree Inc., Goleta, CA (United States)
  3. Dept. of Architectural Engineering, Penn State University, State College, PA (United States)
  4. National Institute of Standards and Technology, Gaithersburg, MD (United States)
  5. Pacific Northwest National Laboratory
  6. Light&Lighting Laboratory/ESAT, KU Leuven, 3000 Ghent, Belgium
  7. Department of Physics and Astronomy, University of British Columbia, Vancouver Canada
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1209003
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 23; Journal Issue: 12; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

David, Aurelien, Fini, Paul T., Houser, Kevin W., Ohno, Yoshi, Royer, Michael P., USA, Richland Washington, Smet, Kevin A. G., Wei, Minchen, and Whitehead, Lorne. Development of the IES method for evaluating the color rendition of light sources. United States: N. p., 2015. Web. doi:10.1364/OE.23.015888.
David, Aurelien, Fini, Paul T., Houser, Kevin W., Ohno, Yoshi, Royer, Michael P., USA, Richland Washington, Smet, Kevin A. G., Wei, Minchen, & Whitehead, Lorne. Development of the IES method for evaluating the color rendition of light sources. United States. https://doi.org/10.1364/OE.23.015888
David, Aurelien, Fini, Paul T., Houser, Kevin W., Ohno, Yoshi, Royer, Michael P., USA, Richland Washington, Smet, Kevin A. G., Wei, Minchen, and Whitehead, Lorne. Mon . "Development of the IES method for evaluating the color rendition of light sources". United States. https://doi.org/10.1364/OE.23.015888. https://www.osti.gov/servlets/purl/1209003.
@article{osti_1209003,
title = {Development of the IES method for evaluating the color rendition of light sources},
author = {David, Aurelien and Fini, Paul T. and Houser, Kevin W. and Ohno, Yoshi and Royer, Michael P. and USA, Richland Washington and Smet, Kevin A. G. and Wei, Minchen and Whitehead, Lorne},
abstractNote = {We have developed a two-measure system for evaluating light sources’ color rendition that builds upon conceptual progress of numerous researchers over the last two decades. The system quantifies the color fidelity and color gamut (change in object chroma) of a light source in comparison to a reference illuminant. The calculations are based on a newly developed set of reflectance data from real samples uniformly distributed in color space (thereby fairly representing all colors) and in wavelength space (thereby precluding artificial optimization of the color rendition scores by spectral engineering). The color fidelity score Rf is an improved version of the CIE color rendering index. The color gamut score Rg is an improved version of the Gamut Area Index. In combination, they provide two complementary assessments to guide the optimization of future light sources. This method summarizes the findings of the Color Metric Task Group of the Illuminating Engineering Society of North America (IES). It is adopted in the upcoming IES TM-30-2015, and is proposed for consideration with the International Commission on Illumination (CIE).},
doi = {10.1364/OE.23.015888},
journal = {Optics Express},
number = 12,
volume = 23,
place = {United States},
year = {2015},
month = {6}
}

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Cited by: 34 works
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Figures / Tables:

Fig. 1 Fig. 1: (a) A light source can induce various color shifts, as shown here in the (a', b') plane, such as (1) desaturating (chroma decrease), (2) hue shift, and (3) saturating (chroma increase). These shifts form a vector field that varies through color space. (b) Hypothetical light source causing purelymore » saturating shifts; loss of fidelity is then associated with a maximal gamut increase.« less

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