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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 19 — Jul. 1, 2008
  • pp: 3423–3432

Implementing dynamic daylight spectra with light-emitting diodes

Neng-Chung Hu, Chin-Chuan Wu, Shih-Feng Chen, and Horng-Ching Hsiao  »View Author Affiliations

Applied Optics, Vol. 47, Issue 19, pp. 3423-3432 (2008)

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Algorithms for selecting LEDs to imitate a group of daylight spectra, instead of fixed-spectrum lighting, are based on minimizing two indices. The first index related to the LEDs only is minimized for determining LED candidates. Minimizing the second index obtained by applying the daylight spectra to the candidates achieves a minimax solution. The sum of the second indices of the daylight spectra can be well approximated by that of the average spectrum of the daylight spectra and is treated as a target spectrum for the LED selection. A pruning process is followed to delete redundant LEDs.

© 2008 Optical Society of America

OCIS Codes
(070.4790) Fourier optics and signal processing : Spectrum analysis
(230.0230) Optical devices : Optical devices
(230.3670) Optical devices : Light-emitting diodes
(300.6170) Spectroscopy : Spectra

ToC Category:
Optical Devices

Original Manuscript: January 30, 2008
Revised Manuscript: May 21, 2008
Manuscript Accepted: May 22, 2008
Published: June 23, 2008

Neng-Chung Hu, Chin-Chuan Wu, Shih-Feng Chen, and Horng-Ching Hsiao, "Implementing dynamic daylight spectra with light-emitting diodes," Appl. Opt. 47, 3423-3432 (2008)

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