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Dim light or even switch it off when it is not needed. This is the task performed by ERCO Casambi motion detectors with light sensor. They control the lighting, e.g. in exhibition spaces, depending on movement in the room. Compared to continuously activated conventional lighting, energy savings of 20 % or more are achieved according to visitor frequency. Because motion detectors reduce the lighting time to the minimum required, sensitive exhibits in exhibitions are protected in the long term.