ABSTRACT
Artificial Lighting controls cover a wide range of complexity, from manual on/off control, to centrally managed photo-responsive dimming systems including scheduling and occupancy detection. Providing daylight in a building does not by itself lead to energy efficiency. Even a well daylit building has a high level of lighting energy use if the lighting controls are inappropriate. Light-switching behaviour (BRE) indicated potential energy savings averaging 20" to 40" in offices and factories if daylighting is used effectively. There are five basic forms of daylight-linked lighting control, such as manual, timed switch-off with optional manual reset, photoelectric switching on/off, photoelectric dimming, and occupancy detectors. Photoelectric control is best suited in areas like corridors, atria and entrance halls, where occupants do not expect to control the lighting. The Lighting and Thermal method uses the concept of passive and non-passive zones. A computer-based model has been used to predict annual primary energy consumption per square metre of floor area, for lighting, heating and cooling.
