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The main objective of this paper is to design a smart lighting system with the aim of energy saving and automatic operation. Smart energy saving light switching system can be used in a room where sun light is not uniformly distributed during the day time. In this paper, two light dependent resistor sensors which are used to detect the intensity of light falling on them and one passive infrared sensor used to detect the movement of human body. The switching algorithm is implemented on AT89S52 microcontroller. The hardware of the switching system is designed, fabricated and tested. It has been observed that the light energy switching system gave fairly good result at different locations.