Maximizing the Attractiveness of Some Familiar Objects Using a Multichannel <scp>LED</scp> Luminaire

ABSTRACT Multi‐channel LED luminaires are becoming more popular and offer a large degree of freedom for retailers when illuminating their products. Inevitably, this raises also the need to select the most appropriate illumination spectrum for any of the presented objects. In this paper, a visual experiment was designed to identify the most attractive appearance of a set of familiar objects under varying illumination conditions. A selection of vegetables and fruits from 5 hue bins were illuminated with a number of illuminants at a predefined chromaticity and correlated color temperatures (CCT) of 3000 K, 4000 K and 6500 K, with a targeted illuminance of 500 lux, strategically selected from the entire range of metamers, which can be generated by the multi‐channel luminaire. Observers were asked to select the most attractive appearance of the presented object in a paired comparison experiment. The results illustrate that optimum spectra that render an object more attractive than other spectra for a statistically meaningful number of observers can be defined for each particular illumination chromaticity. An analysis of the results suggests that the TM‐30 local chroma shift () was the best predictor of attractiveness for the objects involved in the study.