照度, 色温度, 演色評価数が視環境評価に及ぼす影響

Abstract

The relationships between evaluation of visual environment and lighting conditions are described.An experimental room was set up to simulate a usual European-style room in Japan. The interior of the apparatus was about 2.4m in height, 3.6m in width and length.The average illuminance on the floor was adjusted to six levels for each lamp: 20, 40, 80, 160, 300 and 500 lux.41 seven-point semantic differential rating scales were used in this experiment. 12 subjects were asked to give their responses to all the conditions.The results obtained from the principal factor analysis were applied to the varimax method. The factor scores were estimated for each lighting condition.Results are summarized as follows:(1) Three factors: Subjective Brightness, Warm Feeling and Activity, were extracted from a correlation matrix obtained from the subjective assessments.(2) The first factor, subjective brightness, was determined by illuminance, color temperature and'color rendering index. However, the strongest correlation was observed between the first factor and illuminance. This factor accounted for 63.1% of the total variance.The second factor, warm feeling, was determined by color temperature. This factor accounted for 11.4% of the total variance.The third factor, activity, was determined by illuminance. This factor accounted for 9.1% of the total variance.