Daylight sensor systems enable smart lighting control for energy efficiency. The Daylight sensor is an electronics device, which reads available light and sends a signal to the control system. It is used to adjust the electric light from the interior system of the building to reduce energy consumption. The daylight system provides almost 60% of lighting energy to provide comfort in some areas. It is used to maximize entering natural radiant daylight with the planning of a well-designed lighting system. The daylight harvesting is the important application of daylight sensor, which is used to save the cost of energy.