Impression Evaluation of the Appearance of Flowers in LED Lighting System Environments

Abstract

While an object remains the same, the colors which can be seen vary in terms of the object's lighting. In this research, the flowers (cherry blossoms, roses and sunflowers) were selected as objects. An illumination environment that brightly lit up the total view, including the background of the objects (global illumination), and a spot illumination environment that did not directly come into the view of viewers (partial illumination) were set up. Under the above conditions, how the change of color temperature of illumination affected the impression evaluations of the flowers was investigated by a subjective assessment. As a result, When the color temperature changes were controlled, the subjective impressions of the flowers' appearances were also consequentially changed. Moreover, all of the flowers created a warm and clear impression by using lighting of a low color temperature, but as the color temperature rose, the impression made by the objects quickly became more pessimistic. It was revealed that, in the case of global illumination, which brightly lit up the total environment including the background and not just the objects to be illuminated, tended to leave a beautiful impression and easily gave viewers a warm feeling, compared to the case of a partial illumination.