The Variation of Visual Perception according to the Change of Lighting Environments in a Small Office Space

Abstract

This study examines the influence of color temperature and illuminance levels on occupants" visual perception in a small office space. Field measurements and surveys were conducted in a full-scale mock-up space where four lighting conditions were formed by direct/indirect lighting fixtures. Results imply that the perception of glare increased as color temperature of light increased. Under equal color temperature conditions, the increase of illuminance caused more glare. The glare perception for paper tasks was weaker than that of computer tasks. Subjects felt that space became more spacious as color temperature increased under equal illuminance levels. In order to enhance visual comfort under 3500K conditions, the space should be kept bright and lighting environment needs to be maintained in a way that occupants see letters clearly. Under 5000K conditions, the perception of visually warm and brightness is an influential factor on visual comfort.