Wastage of electricity is really enormous with the busy lifestyle of humans. Replacement of Conventional High Intensity Discharge lamps for carpark area with energy efficient LED (Light Emitting Diode) lamps is a most efficient solution to conserve energy. This case study aims to eliminate the manual operations and provide an energy efficient automatic lighting and security system by using sensors. Idea of switching ON-OFF and dimming the light output of the lighting system automatically by sensing the vehicle and human motion helps to conserve energy as well as maximize the efficiency of the system. Sensors are used to detect the presence and motion of vehicles. A microcontroller is used as the brain of the system to control the whole car park lighting. Though LEDs are energy efficient, dimming of LED lamps zone wise depending on occupancy during off peak hours further helps to conserve electricity. This automatic lighting system is essential to conserve energy and avoid electrical power wastage making the system highly economical and reliable.