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Optical Engineering

Spectral design considerations for white LED color rendering
Author(s): Yoshihiro Ohno
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Paper 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 Ra but also the special color rendering indices Ri, 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.

Paper Details

Date Published: 1 November 2005
PDF: 9 pages
Opt. Eng. 44(11) 111302 doi: 10.1117/1.2130694
Published in: Optical Engineering Volume 44, Issue 11
Show Author Affiliations
Yoshihiro Ohno, National Institute of Standards and Technology (United States)

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