Neng-Chung Hu,1,*
Chin-Chuan Wu,1
Shih-Feng Chen,1
and Horng-Ching Hsiao2
1Department of Electronic Engineering and Intelligent Building Research Center, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei, Taiwan
2Department of Electrical Engineering and Intelligent Building Research Center, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei, Taiwan
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.
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