ASSESSING THE PROPORTIONS AND CCT OF DIRECT/INDIRECT LIGHTING IN A REAL LIT OFFICE

摘要

This paper explores how the proportions and CCT of direct/indirect lighting in office affect the subjective perception and work performance of people. Two parts of psychophysical experiments were conducted in a real lit office adjusting the illuminance and CCT of uplight/downlight, respectively. Observers were asked to rate subjective evaluation and test cognitive performance under different light settings. The results of this study showed that both photometric and colorimetric distributions of office lighting influence subject evaluation. Office lighting supplemented by indirect lighting with consistent or inconsistent CCT will improve spaciousness of the room and preference for the environment. However, neither the illuminance nor CCT distribution of the space affects work performance as long as the illuminance and CCT at work plane are held constantly.