1996 年 61 巻 479 号 p. 17-25
An experimental study to evaluate task-ambient lighting systems was carried out in a laboratory which varied in 4 types of lighting. After experiences for a total of 40 days ; ten days at a time, in a room for each type of lighting, fourteen subjects were asked to fill out a questionnaire relating to the visual satisfaction and six activities observed in the room. The evaluation of the task-ambient lighting depended on the work being performed. With increasing ambient illuminance, subjects were satisfied for reading and writing, or meetings. At an ambient illuminance of 200 lux, over 60% of the subjects were satisfied for accomplishing creative work. The low illuminance ambient lighting thus enabled them to concentrate on their creative work.