Spectral design considerations for white LED color rendering

Yoshihiro Ohno

doi:10.1117/1.2130694

1 November 2005 Spectral design considerations for white LED color rendering

Yoshihiro Ohno

Author Affiliations +

Optical Engineering, Vol. 44, Issue 11, 111302 (November 2005). https://doi.org/10.1117/1.2130694

Abstract

White LED spectra for general lighting should be designed for high luminous efficacy as well as good color rendering. Multichip and phosphor-type white LED models were analyzed by simulation of their color characteristics and luminous efficacy of radiation, compared with those of conventional light sources for general lighting. Color rendering characteristics were evaluated based on the CIE Color Rendering Index (CRI), examining not only R_a but also the special color rendering indices R_i, as well as on the CIELAB color difference ΔE^*_ab for the 14 color samples defined in CIE 13.3. Several models of three-chip and four-chip white LEDs as well as phosphor-type LEDs are optimized for various parameters, and some guidance is given for designing these white LEDs. The simulation analysis also demonstrated several problems with the current CRI, and the need for improvements is discussed.

©(2005) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Yoshihiro Ohno "Spectral design considerations for white LED color rendering," Optical Engineering 44(11), 111302 (1 November 2005). https://doi.org/10.1117/1.2130694

Published: 1 November 2005

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