China manufacturer of magnetic ballasts for metal halide flood lights & hps flood lights

City street light at night lights commonly used light source, light like the sun brought the light to the people. On the nature of light, Maxwell proposed the theory of electromagnetic waves in the history. In the electromagnetic wave, the electromagnetic wave with wavelength of 380 ~ 780nm can be generated by people's eyes, and this part of the electromagnetic wave is visible light. Wavelength from 380nm to 780nm increased, the color of the light purple, blue, green, yellow, red sequence. Light color and color table including two color display. Color table is the color of light source, that is, from the appearance of the color of light; color rendering is refers to the light source lighting, a variety of color in the visual distortion level, usually with color rendering index.

When the light source is the same as the reference light source, the color value is 100, the color difference is smaller. When the city lights use high-pressure mercury lamp illumination, if viewed from afar, people will feel its light is bright white. But it is to see the irradiation face, like a face with a layer of graphite, and feel not satisfied. Because the line is missing in the blue and green lamp. Especially red. So it looks uncomfortable. This shows that the high pressure mercury lamp color table is good, light white and bright, but the color is not good. The incandescent lamp light source and the mercury light source opposite. It looks like the lamp is not good, but the color of the object is very little distortion. Good color for incandescent lamp. Sodium lamp light color is yellow, when put in a blue cloth in sodium light blue cloth into the cloth. Description of the sodium lamp color and color are not good. From these examples, we can see that the color table of the light source is different from that of color.

The main characteristics of the light source of the street lamp are the light source of the city street lamp, which should have good lighting performance and reasonable energy saving effect. Requirements of street lamp electric light source is, therefore, a long life, high light efficiency, good color and consistency, in maintenance lighting has the interchangeability. At present, urban street lamps using high efficiency of metal vapor arc discharge lamp, such as high pressure mercury lamp, high pressure sodium lamp as the light source. They have high luminous efficiency and good color of, long life advantages. The main purpose of the main characteristics of the light source is to improve the economic benefit and practical value of the street lamp.

The luminous efficiency of high pressure sodium lamp is a high pressure mercury lamp 2 to 3 times, the average life expectancy is 4 times of the high pressure mercury lamp. And high-pressure sodium lamp color rendering index and power factor was significantly lower than that of the high pressure mercury lamp; starting calibration time and stroboscopic effect two characteristics are almost the same. By comparison, it provides the basis for choosing the light source of the light source to realize the green illumination. Street lamp electrical characteristics of the source table light name incandescent lamps high pressure mercury lamp high pressure sodium lamp luminous efficiency (LM / W) 6.9 ~ 1930 to 5090 ~ 100 and the average life (H) 1000600024000 chromogenic index Ra95 ~ 9930 to 4020 ~ 25 start calibration time t1/min instantaneous 4 ~ 84 ~ 8 restart time t2/min instantaneous 5 ~ 1010 ~ 20 power factor cos 4mm 1 44 000 to 0 67 44 stroboscopic effect is not obvious significant changes in voltage of luminous flux high significantly environmental temperature on optical effect is small