Street lighting plays a vital role in public safety but consumes a significant amount of electrical energy. Conventional street lights operate continuously throughout the night, leading to unnecessary power wastage. This paper presents the design and implementation of a solar powered smart street lighting system with motion detection to improve energy efficiency. The proposed system uses solar energy as the primary power source and a motion sensor to control light intensity based on human or vehicle movement. During periods of no motion, the light remains in dim mode, and it switches to full brightness when motion is detected. The system is controlled using a microcontroller and operates automatically without manual intervention. Experimental results show that the proposed system significantly reduces energy consumption and maintenance costs, making it suitable for smart city applications.