the main qualities of your light source of the lamp will be the light source of the city street lamp, which should really have good lighting characteristics and affordable power conserving result, decrease environmental pollution and recognize green lighting. Necessities of street lamp electrical light supply is, as a result, a long life, higher light efficiency, fantastic color and consistency, in maintenance lighting has the interchangeability. At current, urban street lamps working with substantial efficiency of metal vapor arc discharge lamp, such as substantial pressure mercury lamp, large stress sodium lamp as the light supply. They’ve substantial luminous efficiency and fantastic shade of, lengthy life pros. The primary function of your principal qualities of the light supply will be to boost the financial advantage and sensible worth with the street lamp. Common light supply characteristics of street lamps are proven in table one. From table 1 we will see that the luminous efficiency of high strain sodium lamp is actually a higher stress mercury lamp two to 3 times, the average life expectancy is 4 times of the large stress mercury lamp. And high-pressure sodium lamp shade rendering index and energy issue was significantly reduce than that in the large strain mercury lamp; starting calibration time and stroboscopic impact two qualities are virtually the same. By comparison, it supplies the basis for choosing the light supply of the light supply to realize the green illumination. Table 1 street electrical qualities from the source table light title incandescent lamps higher pressure mercury lamp substantial pressure sodium lamp luminous efficiency (LM / W) six.9 ~ 1930 to 5090 ~ a hundred as well as regular existence (H) 1000600024000 chromogenic index Ra95 ~ 9930 to 4020 ~ 25 commence calibration time t1/min instantaneous 4 ~ 84 ~ 8 restart time t2/ min instantaneous 5 ~ 1010 ~ twenty power aspect cos 4mm one 44 000 to 0 67 44 stroboscopic impact is not really apparent significant alterations in voltage of luminous flux higher appreciably environmental temperature on optical impact of compact small