Smart Lighting for Smart Cities

While the efficacy of a fixture gets decided by the technology but we always need to look for optimisation of usage by minimising human interference during operation and control. The paper gives an insight in to control of lighting system in a smart manner with least human interference. Smart lighting system comprises of the Main server, local controllers and LED lighting fixtures. For street lighting systems, the communication between Main server and local controllers is through GSM network while that between local controllers and lighting fixtures is in two ways viz through power cabling network or through RF communication. For indoor lighting systems for the case of main server within the premises, the communication between the components of the smart lighting system is either hard wired or through RF communication. Different types of sensors are provided like photo sensor, motion sensor and astronomical timer. Based on the inputs of the sensor, the lighting is either switched ON/OFF or dimmed. The dimming action is by controlling the input voltage to the fixture or driver. The control can be either individual or in groups.