An experimental study on the appraisal of the visual environment at offices in relation to colour temperature and illuminance

Colour temperature and illumination level have affected the subjective impressions at an office setting. 2000 lx was preferred to 500 lx for impressions of comfort, spaciousness, brightness and saturation evaluation. A 4000 K colour temperature was preferred to 2700 K for impressions of ‘comfort and spaciousness’, while 2700 K was suggested for ‘relaxation’ and ‘saturation evaluation’. Test results indicate that, task–background contrast is more important and shall be studied for ‘perceived brightness’ evaluation. Participants liked the ‘mixed colour temperature mood’, the remote control and the flexibility in the lighting system and the majority offered to use it at offices.