With this kind of control, lights are switched off at a central panel at the same time each day, coinciding for example with breaks or the end of working days. It is important to include local override so that lighting can be restored if the occupants need it. Time signals may be derived from a variety of devices ranging from the simple multi-position electromechanical switch to solid state switches. Time signals may also be derived from building management systems. These signals must be transmitted to the luminaires through a communications channel. This can be the mains wiring itself or a dedicated low voltage wiring bus connected to receivers in each luminaire or group of luminaires.

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