Document Detail


Color temperature tunable white-light light-emitting diode clusters with high color rendering index.
MedLine Citation:
PMID:  20733639     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
A model for LED spectra at different drive currents is established. The simulation program of color rendering of a white-light LED cluster is developed according to the principle of additive color mixtures. The program can predict not only the spectral power distribution, chromaticity coordinates, correlated color temperature (CCT), and color rendering index (CRI), but also the drive currents of LEDs, luminous flux, input power, and luminous efficacy of white-light LED clusters. Three types of CCT tunable white-light LED clusters [warm-white/red/green/blue (WW/R/G/B), neutral-white (NW)/R/G/B, and cool-white/R/amber/G clusters] with high CRI are found by simulation analysis and realized in our laboratory. The experimental results show that the WW/R/G/B cluster can realize CCT tunable white light with high CRIs (above 90) but lower luminous efficacies (below 65 lm/W), and that the NW/R/G/B cluster can realize CCT tunable white light with high CRIs (above 86), as well as high luminous efficacies (above 64 lm/W).
Authors:
Guoxing He; Lihong Zheng
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Applied optics     Volume:  49     ISSN:  1539-4522     ISO Abbreviation:  Appl Opt     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-08-24     Completed Date:  2010-12-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0247660     Medline TA:  Appl Opt     Country:  United States    
Other Details:
Languages:  eng     Pagination:  4670-6     Citation Subset:  -    
Affiliation:
Department of Applied Physics, Dong Hua University, 1882 Yan'an Road (W), Shanghai 200051, China. gxhe@dhu.edu.cn
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