Journal
JOURNAL OF DISPLAY TECHNOLOGY
Volume 9, Issue 6, Pages 405-412Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JDT.2012.2224638
Keywords
Chromaticity; color rendering index; color temperature; illumination; light-emitting diodes; lighting; luminous efficacy; solid-state lighting; spectral efficiency; spectral power distribution; white light
Funding
- U.S. Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
- Sandia's Solid-State-Lighting Science Energy Frontier Research Center
- U.S. Department of Energy, Office of Basic Energy Sciences
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We calculate numerically the spectral power distributions (SPDs) which maximize luminous efficacies of radiation (LERs) for white light of particular color rendering indices (R-a's) and color temperatures (CTs). We find that, except for the very highest color rendering indices, the spectra are spiky rather than continuous. We present a useful analytic expression for the dependences of the maximum white luminous efficacy of radiation (MWLER) on R-a and CT and discuss these dependences. We propose that, for any white light source of a given R-a and CT, its absolute spectral efficiency is simply the ratio of its LER to the MWLER at that same R-a and CT. We discuss the absolute spectral efficiency, defined in this way, of various lighting technologies: incandescent, fluorescent, high-intensity discharge, and solid-state lighting. Finally, we discuss the possibility of alternative MWLERs based on alternative indices for color rendering quality.
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