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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 24 — Aug. 20, 2010
  • pp: 4670–4676

Color temperature tunable white-light light-emitting diode clusters with high color rendering index

Guoxing He and Lihong Zheng  »View Author Affiliations


Applied Optics, Vol. 49, Issue 24, pp. 4670-4676 (2010)
http://dx.doi.org/10.1364/AO.49.004670


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Abstract

A model for LED spectra at different drive currents is established. The simulation program of color rendering of a white-light LED cluster is developed according to the principle of additive color mixtures. The program can predict not only the spectral power distribution, chromaticity coordinates, correlated color temperature (CCT), and color rendering index (CRI), but also the drive currents of LEDs, luminous flux, input power, and luminous efficacy of white-light LED clusters. Three types of CCT tunable white-light LED clusters [warm-white/red/green/blue (WW/R/G/B), neutral-white (NW)/R/G/B, and cool-white/R/amber/G clusters] with high CRI are found by simulation analysis and realized in our laboratory. The experimental results show that the WW/R/G/B cluster can realize CCT tunable white light with high CRIs (above 90) but lower luminous efficacies (below 65 lm / W ), and that the NW/R/G/B cluster can realize CCT tunable white light with high CRIs (above 86), as well as high luminous efficacies (above 64 lm / W ).

© 2010 Optical Society of America

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(330.1715) Vision, color, and visual optics : Color, rendering and metamerism

ToC Category:
Optical Devices

History
Original Manuscript: May 21, 2010
Revised Manuscript: June 26, 2010
Manuscript Accepted: July 29, 2010
Published: August 19, 2010

Citation
Guoxing He and Lihong Zheng, "Color temperature tunable white-light light-emitting diode clusters with high color rendering index," Appl. Opt. 49, 4670-4676 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-24-4670


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References

  1. I. Speier and M. Salsbury, “Color temperature tunable white light LED system,” Proc. SPIE 6337, 63371F (2006). [CrossRef]
  2. Y. Ohno, “Color rendering and luminous efficacy of white LED spectra,” Proc. SPIE 5530, 88–98 (2004). [CrossRef]
  3. S. Chhajed, Y. Xi, Y. L. Li, T. Gessmann, and E. F. Schubert, “Influence of junction temperature on chromaticity and color-rendering properties of trichromatic white-light sources based on light-emitting diodes,” J. Appl. Phys. 97, 054506 (2005). [CrossRef]
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  5. M. Dyble, N. Narendran, A. Bierman, and T. Klein, “Impact of dimming white LEDs: chromaticity shifts due to different dimming methods,” Proc. SPIE 5941, 59411H (2005). [CrossRef]

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