Solar street lights are composed of the following parts: solar cells, batteries, control inverters, light control and timers, and luminous bodies. Solar street lights are an automatically controlled working system. As long as the working mode of the system is set, the work will be automatically controlled. Control modes are generally divided into three types: light control start, light control off; timing control start and timing control off; light control start and timing control off. Generally, this mode is selected to work, and the lamp transmits light when the sunlight reaches the set value. The sense control starts the light operation and the timing starts at the same time. It will stop working when the timer reaches the set time. The solar cell of the system has two functions: first, to charge the battery during the day; second, to act as a light control sensor and use the charging and discharging of RC elements. Generally, 18-watt or 36-watt low-pressure sodium lamps are used as light sources because their light efficiency is the highest among light sources.