High pressure mercury vapor discharge lamp is a high-pressure mercury vapor discharge lamp coated with fluorescent powder on the inner surface of the glass shell, with a soft white light and simple structure. Low cost, low maintenance cost, and can directly replace ordinary incandescent lamps. It has the characteristics of high light efficiency, long service life, and electricity saving economy, and is suitable for industrial lighting, warehouse lighting, street lighting, flood lighting safety lighting, etc. A high-pressure mercury lamp is composed of a quartz arc tube, an outer bubble shell (usually coated with fluorescent powder inside), a metal bracket, a resistor, and a lamp head. The arc tube is the core component, filled with mercury and inert gas. When discharging, the internal mercury vapor pressure is 2-15 atmospheres, hence it is called a high-pressure mercury lamp. The high-pressure mercury lamp adopts advanced lamp making technology, resulting in higher light efficiency and longer lifespan. It emits white light, with a color temperature of around 4100K, and is economical and widely used in industrial lighting and road lighting fields both indoors and outdoors. The self ballasting high-pressure mercury lamp is very convenient to use as it does not require an external ballast. Its light efficiency is twice that of incandescent lamps, and its lifespan is 10 times that of incandescent lamps. It is also economical and widely used in indoor and outdoor industrial lighting, courtyard lighting, street lighting, and other fields. High voltage mercury lamps usually use inductive ballasts with parallel compensating capacitors. Another type of self ballasted high-pressure mercury lamp is convenient to use due to the installation of a tungsten wire as a ballast inside the outer bubble shell, which eliminates the need for an external ballast