This document describes a solar-powered street light system with automatic intensity control using an Arduino. The system uses a solar panel, battery, LED lights, light dependent resistor (LDR), infrared sensor, and Arduino board. It aims to efficiently control street light intensity based on detected ambient light levels to reduce energy consumption compared to traditional street lighting. The system intensity varies the LED brightness based on the measured light from the LDR rather than using preset time slots. When darkness is detected, the LED intensity increases accordingly to save energy by only powering lights as needed. The automatic control replaces manual operation and wasteful all-night lighting to help conserve electrical power through renewable solar technology.