Abstract
The purpose of this investigation is to quantify the influence of the peak wavelength shifts in commercially available LEDs on the characteristics of the mixed-LED white-light sources. For this purpose, a tetrachromatic spectrum was optimized and then subjected to deviations in the peak wavelengths. A total of 882 combinations of peak wavelength values were evaluated, and the results are reported in terms of correlated colour temperature, colour-rendering properties, and radiant luminous efficacy. The results show that there can be significant changes in the characteristics of the source under these conditions. Such changes are highly likely to present problems when dealing with applications where an effective and accurate white-light source is important.
Highlights
White light can be produced by additively combining the outputs of multiple monochromatic light-emitting diodes (LEDs) [1,2,3,4,5,6]
By fine-tuning the spectral intensity of individual LEDs, which emit different narrow bands of radiation, a white-light source characterized by a good colour-rendering index, Ra, and high luminous efficacy of radiation, ηrad, can be designed
TcRj shows the dependence of Tc on λRj, while other LEDs are at λk(typ), TcGj shows the dependence of Tc on λGj, while other LEDs are at λk(typ), and so on
Summary
White light can be produced by additively combining the outputs of multiple monochromatic light-emitting diodes (LEDs) [1,2,3,4,5,6]. By fine-tuning the spectral intensity of individual LEDs, which emit different narrow bands of radiation, a white-light source characterized by a good colour-rendering index, Ra, and high luminous efficacy of radiation, ηrad, can be designed. Creating a stable white light using multiple LEDs is a complex task since both colour rendering and luminous efficacy of the mixture depend on the emitted spectrum of the individual LEDs. any change in the LED parameters (peak wavelengths, spectral widths, lumen outputs, etc.), for example, due to variations in junction temperature of the LEDs, causes a change in the spectrum of the LED devices and a change in the spectrum of the white-light source [7, 8]. Reciprocal megakelvins were formally known as “microreciprocal degrees”, abbreviated to “mireds.”
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