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Advances in OptoElectronics
Volume 2015, Article ID 263791, 10 pages
http://dx.doi.org/10.1155/2015/263791
Research Article

Optimization of Multiband White-Light Illuminants for Specified Color Temperatures

1Manukau Institute of Technology, Private Bag 94006, Manukau 2241, New Zealand
2Auckland University of Technology, Institute of Biomedical Technologies, Private Bag 92006, Auckland 1142, New Zealand

Received 21 January 2015; Accepted 19 April 2015

Academic Editor: Xian An Cao

Copyright © 2015 Snjezana Soltic and Andrew Neil Chalmers. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper describes an effective approach for the optimization of multiband spectra to produce prospective white-light spectra having specific color temperatures. The optimization process employs a genetic algorithm known as differential evolution, which aims to minimize the color rendering differences between a prospective white-light spectrum and its corresponding reference illuminant. Color rendering is assessed by calculating the CIEDE2000 color difference (ΔE00) for 14 CIE test colors under the two sources. Optimized white-light spectra were matched to three CIE standard illuminants, that is, A (2856 K), D50 (5003 K), and D65 (6504 K). Optimal solutions for three- and four-band 25 and 50 nm Gaussian spectra are presented and analyzed, together with mixed 4-LED spectra that were optimized in the same way. In all cases, the simulated sources were shown to provide color rendering of such quality that ΔE00av ≤ 2.24 units. Such white-light sources would likely find wide acceptance in numerous lighting applications.