Street lamp solar advantage than traditional high pressure sodium lamp?

LED street lamp and high pressure sodium lamp, although more LED luminous efficiency than from the digital but high pressure sodium lamp ( The luminous efficiency of high pressure sodium lamp 132 Im/W, and LED only 90 Im/W) , but LED to the development of great potential. Table 4 - 4 is a comparison of various kinds of the luminous efficiency of lamps and lanterns. High pressure

the LED street lamp and high pressure sodium lamp is

the LED luminous efficiency although than from the digital high pressure sodium lamp ( The luminous efficiency of high pressure sodium lamp 132 Im/W, and LED only 90 Im/W) , but LED to the development of great potential. Table 4 - 4 is a comparison of various kinds of the luminous efficiency of lamps and lanterns.

high pressure sodium lamp spectrum is more focused on yellow, colour temperature is lower, it is only 2000 ~ 2500 k, and the LED color temperature is higher, can reach more than 3500 ~ 4500 k. Another high pressure sodium lamp light is to launch around, a large portion of the light cannot reach the road. Color rendering index is low and high pressure sodium lamp, only 20 ~ 40, feel the dark; And LED high color rendering index, can reach 75 ~ 80, so the road surface bright, feel comfortable. From the perspective of the luminous effect of actual, LED is better than high pressure sodium lamp. 100 w leds can replace 250 w high pressure sodium lamp, or mercury lamp of 300 w. The output of 100 w LED luminous flux is only about 6250 Im ( Through the secondary optical design, will have losses) The luminous flux, arrived at the road is still the 6000 Im, and the road surface can reach the average illuminance on the 16 lx ( 12 m high) 。 The output of 250 w high pressure sodium lamp luminous flux is 200001 x, but only 7000 Im, the luminous flux to the road pavement illuminance is 30 ~ 40 lx. Because the coefficient of color difference, the LED illumination correction coefficient of 2. 35, high-pressure sodium lamp correction coefficient of 0. 94. So, 100 w LED the ground illumination for 37 after revised. Six lx, and high pressure sodium lamp the adjusted illuminance for 28. 2 ~ 37. 6 lx, both. So, using the 100 w leds can replace the 250 w high pressure sodium lamp, LED can energy saving 60%.

high pressure sodium lamp design life is 20000 h, due to the influence of the voltage variation, and a large starting current, its actual life usually only 4000 h, assume that every day work lOh, only 400 days, with more than a year to be replaced; And the life of the high power LED is 50000 h, assume that every day work lOh, use 13. Section 7 years need to be replaced, this greatly Yuan maintenance costs. LED lamps and lanterns with high pressure sodium lamp is shown in table 4 5.