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A building relying on manual switching alone could result in unacceptable energy wastage.

  1. Centralised switching: Experiments prove that if lights are programmed to switch off automatically at certain times of the day, then only a small percentage of occupants bother to turn them on again. This implies that they are comfortable enough using either natural light or task lighting; in which case the main lighting is superfluous. Centralised controls provide the timed switching function.

  2. Local movement detection: By providing the means to sense when a room is in use and linking it to the lighting switching, it is possible to design a scheme that is used only when occupants are present. Passive infra-red (PIR) detection is used in this application. These can be independent or linked to a more extensive lighting control system.

  3. For the ultimate in control: A combination of PIR detection and daylight linking offers very efficient operation and increasingly is the goal for a majority of businesses.

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