This paper is part of a project to establish the optimal spectral power distributions of LED light sources for use in offices, commerce and homes. The present paper introduces the most important aspects of home lighting and provides recommendations for optimum spectra in the home environment. Visual experiments were carried out in a real scale kitchen/dining room and in a living room environment with the participation of nearly 100 observers. Results have been evaluated with the help of the analytic hierarchy process (AHP) and a modified Thurstone method. As a result of the investigation, optimal spectral power distributions for the home environment are described.
This paper provides recommendations for optimum LED light spectra in shop environments. The main aspects of the research were to elaborate the optimal LED spectral power distribution for the lighting of different colour textiles, fruits and vegetables, meat and bakery products. The spectrum was tailored towards different colour quality metrics such as the colour rendering index and the colour quality scale. Small scale investigations with eye-tracker studies were carried out by Osram Opto Semiconductors at the University of Regensburg and full scale experiments were conducted at the University of Pannonia during the project in order to determine which metric correlates best to the preference of the observers. Results of the psychophysical have been evaluated with the help of analytic hierarchy process and a modified Thurstone method. As a result of the investigation, optimal spectral power distributions for shop environment are described.
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