Currently, light is one of the most important assets of human life. Smart light street system is the needed equipment of the people when travel at the night time. That because the condition when people travel at the night is dangerously, occurrence robberies and accident increase month by month. This equipment can give benefit for people, country and safety to who use this street it. Besides that, our country able to saving money and more electric energy than another country because the coast to make this project is low and easy to make it. This model used Arduino UNO, Infrared (IR) Sensor, Light Emitter Resistor (LED) and Light Dependent Resistor. In this project, the main control of our project is Arduino Uno, if don’t have Arduino Uno our project will be very difficult. Next IR sensor have led that need together when use and function. Besides that, LDR is a sensor for detected brightness and we need to code if want low or high brightness and the output as light and LED. Our project used all of this component, and the operation will be when the brightness “LOW”, Arduino UNO will switch ‘ON’ the current and IR sensor will function to detected thing. Next, if IR sensor detected thing the output will switch “ON”, the output is light.