Abstract
This study was conducted to evaluate the difference of the semantic structures concerning comfortable lighting in a living room between the aged and the younger. Two psychological experiments, one using the evaluation grid method and the other using the semantic differential method, were carried out by means of photographs illuminated of living rooms. From the results of the experiment using the evaluation grid method, thirty four and forty one elements emerged from the aged subjects and the younger subjects respectively, showing that the comfortable lighting approximately means calm warm lighting. These elements are connected with the concrete elements such as lighting design of the space, color temperature of a light source, design of lighting equipments and the lightness of the space. From the results of the experiment using the semantic differential method, four factors, namely "warmness", "calmness", "variation" and "lightness," were extracted from the both generations. However the importance of "lightness" was clearly different between the aged and the younger, the former think it more important than the latter.
