This document provides a design report for a smart street light system that aims to reduce energy wastage by automatically controlling street lights based on sunlight intensity and detecting movement. The system uses an Arduino microcontroller along with light dependent resistors and infrared proximity sensors to sense the environment and control street lamp brightness accordingly. It is designed to switch lights on when sunlight is low and increase brightness when motion is detected to save electricity without compromising visibility needs. The report outlines the objectives, design considerations, components, and challenges of implementing such a system.