Evaluation of lighting performance in office buildings with daylighting controls

Lighting control integrated with daylighting is recognised as an important and useful strategy in energy-efficient building designs and operations. It is believed that proper daylighting schemes can help reduce the electrical demand and contribute to achieving environmentally sustainable building de velopment. This paper presents field measurements on daylighting for a full y air-conditioned office building in Hong Kong. Electricity consumption by the fluorescent luminaires, indoor illuminance levels and the room paramete rs affecting daylighting designs were recorded and analysed. The measuremen ts covered several cellular offices facing opposite orientations with and w ithout daylighting controls. The findings suggest that daylighting schemes can result in substantial energy savings in air-conditioned office building s in Hong Kong. Results are presented and the design implications are discu ssed. (C) 2001 Elsevier Science B.V. All rights reserved.