A study of preferred colour rendering of light sources: Shop lighting

Abstract

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.

A New Statistical Method for Ranking of Light Sources based on Subjective Points of View

“…Only the 2 nd test light shows similarity with the 3 rd illuminant. A more detailed presentation of the results was published in [2].…”

“…A possible connection between the AHP weights and the estimated expectations is presented. The method was successfully applied in choosing light sources for home lighting and shop lighting [1,2] and can be applied in the case of further choices based on subjective points of view. The results of the experiments depend on the dominant color of the illuminated objects.…”

“…The application area of Light Emitting Diodes (LEDs) in lighting technology has been growing significantly. LEDs are used nowadays not only as signaling lights but also as functional lighting in public lighting, home [1] and shop lighting [2], museum lighting [3], sport lighting and so on. At the beginning of the LED era, phosphor converted white LEDs had been used as a light source for general lighting.…”

Thewhatand thewhereof vision lighting research

“…Rather, it has almost always been aimed at providing guidance for different lighting applications, such as security lighting, 30 driving safety, 31–35 task performance, 36–43 or associated problems, such as discomfort glare 44–46 or poor colour rendering. 47–50 From the perspective of vision neuroscience, it is hard to establish sound general principles from this type of vision lighting research because each application is unique with regard to the seamless organisation of the what and the where sub-systems. Once stated, this tight integration of what and where seems rather obvious, and indeed important to study, because an effective lighting application must serve both of these visual functions.…”

Affective matches of fabric and lighting chromaticity

“…Regarding the influence of ambient lighting on the style of clothes, most studies have paid attention to either quality rendering of textile colors [1][2][3] or the attractive presentation of apparel goods in natural lighting conditions only. [4][5][6][7] The studies have mainly approached the affective effects of varied ambient lighting chromaticity in relation to fabric type and colors, which were not investigated in previous studies.…”