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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 8, Iss. 3 — Apr. 4, 2013

Wavelength dependence of colorimetric properties of lighting sources based on multi-color LEDs

Hongtao Li, Xianglong Mao, Yanjun Han, and Yi Luo  »View Author Affiliations

Optics Express, Vol. 21, Issue 3, pp. 3775-3783 (2013)

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Taking color quality scale (CQS) as color rendering assessment criterion, the parameters including each color LED’s peak wavelength λi and fractional radiant flux Ii are optimized using genetic algorithm to maximize the luminous efficacy of radiation (LER) of the spectral power distributions (SPDs) of multi-color white light source with 3 to 7 components while maintaining the deviation of its color and color-rendering capability from that of the reference light source within the specified scope. Then the wavelength dependence of these SPDs is analyzed. It is shown that to achieve a Qa greater than 95 (5-color LEDs) or even close to 100 (7-color LEDs), the spectral energy could be concentrated in the range of 410~675 nm, indicating that this wavelength range makes a major contribution to high color rendering properties. Spectra filtering experiments show that spectrum around 580nm is harmful to color rendering. To obtain a white light source composed of 3-color LEDs with CQS Qa ≥ 80 and correlated color temperature (CCT) within 2700-6500K, the energy ratios among 410-495nm, 495-595nm, and 595-675nm intervals, can be simplified as that of the reference source with the same CCT.

© 2013 OSA

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(230.6080) Optical devices : Sources
(330.1690) Vision, color, and visual optics : Color
(330.1715) Vision, color, and visual optics : Color, rendering and metamerism
(220.2945) Optical design and fabrication : Illumination design

ToC Category:
Vision, Color, and Visual Optics

Original Manuscript: August 31, 2012
Revised Manuscript: January 12, 2013
Manuscript Accepted: January 30, 2013
Published: February 7, 2013

Virtual Issues
Vol. 8, Iss. 3 Virtual Journal for Biomedical Optics

Hongtao Li, Xianglong Mao, Yanjun Han, and Yi Luo, "Wavelength dependence of colorimetric properties of lighting sources based on multi-color LEDs," Opt. Express 21, 3775-3783 (2013)

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