Light & Engineering 27 (1)

Volume 27
Date of publication 02/20/2019
Pages 86–96

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LEDs Colours Mixing Using their SPD and Developing of the Mathematical Model for CCT Calculation. L&E 27 (№1. 2019)

Articles authors:

Canan Perdahci, Hamdi Özkan

Canan Perdahci, Ph. D., Associate Professor. She received the B. E. and M. Sc. degrees in electrical engineering from the University of Yildiz, Istanbul, Turkey, in 1991 and 1993, respectively, and the Ph. D. degree in electrical engineering from the University of Kocaeli, Kocaeli, Turkey, in 1997. In 1992, she joined the Department of Electrical Engineering, University of Kocaeli, as a Lecturer, and in 2019 became an Associate Professor. Her current research interests include LED lighting, UVC, power quality, tunnel lighting, road lighting

Hamdi Özkan, received the B.D. in machine engineering from the University of Trakya, Edirne, Turkey, in 2003. In 2007, he joined the Production Department of Litpa Lighting as a machine engineer, and in 2003 became a Responsible of Research & Development Department. His current research interests include mechanical and optic design of the luminaires and spectral structure of the light

Abstract

Light is a condition that human beings are subjected to in nature. Light is not only a physical parameter but also an important factor, which is affecting the mental and cognitive performance of the person. For this reason, in recent years, many researchers and scientists have been working on and exploring this direction of light. The spectral structure of light in the natural environment shows a continuous change. We can define this natural environment as the spectral transformation of daylight in open air. Thus, people who remain in closed environments during the day are living under unfavourable conditions, such as constant colour temperatures and luminous flux of illumination. The studies aimed at reducing this harmful effect the most. These studies are based on the principle that all intermediate colours are obtained by blending the light in 2 different colours (usually one is very warm white and the other is very cold white) and that the intermediate colours are timed within a certain scenario and illuminated indoors to simulate the outside environment. In this study, the mixture of light sources in different colours was mathematically modelled in computer environment and the CCT in K of the mixture was calculated. It is also optimized to obtain the mixture colour with least mistakes of the mixture functions by comparing with the actual measurement results.

References

1. CIE Publication: Color-matching functions for CIE2° Standard Observer (1931).
2. CIE Publication,1932. Commission Internationale de l’Éclairage Proceedings, 1931. Cambridge: Cambridge University Press.
3. CIE15:2004 3rd Edition – CIE Standars on Colorimetry.
4. McCamy, C. S. 1992. Correlated Colour Temperature as an Explicit Function of Chromaticity Coordinates, Colour Research & Application 17:142–14.

Keywords

DOI: https://doi.org/10.33383/2017-082