EXPERIMENTAL STUDY ON ILLUMINANCE DISTRIBUTION IN THE TASK AND BACKGROUND AREA OF OPEN-OFFICE LIGHTING

摘要

In recent years, both the quality of the light environment and the reduction of lighting energy are required in offices. To realize these requirements, it is effective to reduce the illumination of background area where occupants are absent while keeping the brightness of the task area where occupants are present. In this study, we conducted a subjective evaluation of spatial brightness in a non-uniform lighting environment based on the European standard and in a uniform lighting environment. In the experiment, the satisfaction of the whole lighting environment was taken as a superordinate concept, and the absolute level of brightness, visibility, the appropriateness of brightness, and non-uniformity were evaluated as factors explaining the satisfaction. As a result, in the non-uniform lighting environment in conformity of the European standard, while visibility and absolute brightness levels around desktops were highly evaluated, the level of satisfaction with light environment was low.