Because of the different core accessories, the ballast is divided into inductive high-pressure sodium lamp and electronic high-pressure sodium lamp, high-pressure sodium lamp of different power, so the high-pressure electric lamp is from inside to outside by mercury, sodium, mercury, arc tube wick, glass bulb, getter lamp Etc. LED is also called light-emitting diode. The core part is a chip composed of P-type semiconductor and N-type semiconductor. There is a transition layer between P-type semiconductor and N-type semiconductor, called PN junction. Current. When flowing from the anode of the LED to the halogen, the semiconductor crystal will emit different colors of light from purple to red, and the intensity of the light is related to the current. According to the luminous intensity and working current, it can be divided into ordinary brightness (luminous intensity <10 mcd), high brightness (luminous intensity 10~100 mcd) and ultra-high brightness (luminous intensity> 100 mcd). Its structure is mainly divided into four major blocks: the structure of the light distribution system, the structure of the heat dissipation system, the drive circuit and the mechanical/protective structure.