High pressure sodium lamps emit a golden white light when used, which has the advantages of high luminous efficiency, low power consumption, long service life, strong fog permeability, and non rusting. Widely used in roads, highways, airports, docks, docks, stations, squares, street intersections, industrial and mining enterprises, parks, courtyard lighting, and plant cultivation. High color high-pressure sodium lamps are mainly used for lighting in sports venues, exhibition halls, entertainment venues, department stores, and hotels. The high-pressure sodium lamp was first introduced in the 1960s and is the most efficient high-intensity gas discharge lamp, known as the third generation lighting source. High pressure sodium lamps are different from low pressure sodium lamps in that their spectrum is no longer monochromatic yellow light, but rather spreads over a relatively wide frequency range. By relaxing the spectral lines, the high-pressure sodium lamp emits a golden white light, which allows for color differentiation. Due to the characteristics of high light efficiency, long lifespan, acceptable color rendering, non insect attraction, and difficulty in fading the illuminated object, high-pressure sodium lamps are widely used in various corners of ordinary lighting, gradually replacing the relatively energy-efficient fluorescent high-pressure mercury lamps. The recently developed color improvement and high color rendering high-pressure sodium lamps can replace incandescent lamps, achieving great energy-saving effects. After the high-pressure sodium lamp is activated, the initial stage is low-pressure discharge of mercury vapor and xenon gas. At this time, the working voltage of the light bulb is very low and the current is high; As the discharge process continues, the arc temperature gradually increases, and the vapor pressure of mercury and sodium is determined by the coldest end temperature of the discharge tube. When the cold end temperature of the discharge tube stabilizes, the discharge tends to stabilize, and the luminous flux, working voltage, working current, and power of the bulb are also in normal working conditions. Under normal working conditions, the entire startup process takes about 10 minutes. The fluctuation of power supply voltage will inevitably cause changes in the light and electrical parameters of the bulb; If the power supply voltage rises, it will cause an increase in the working current of the bulb, which will increase the temperature of the cold end of the arc tube, increase the vapor pressure of mercury and sodium, and increase the working voltage and bulb power, resulting in a significant decrease in the lifespan of the bulb; On the contrary, if the power supply voltage decreases, the light cannot work properly, the luminous efficiency decreases, and it may also cause the light bulb to fail to start or self extinguish. Therefore, it is required that customers should not experience excessive fluctuations in the power supply voltage when using bulbs, and generally require changes within the range of+6% to -8% of the rated value