The life of the LED street lamp and high pressure sodium lamp which is longer?1

LED street lights and the comparison of high pressure sodium lamp: follow the solar street lamps factory to know about the below.

in the first place, high pressure sodium lamp spectrum is focused on the yellow it is only 2000 - color temperature is low 2500 ok, and can achieve 3500 - LED color temperature higher More than 4500 ok.

the second high pressure sodium lamp light is to launch around a large portion of the light cannot reach the road. Not only that, high pressure sodium lamp color rendering index is poor, only 20 to 40, feel dim. And the LED can achieve 75 - high color rendering index 80. So the road surface bright, feel comfortable.

so, from the perspective of the luminous effect of actual, leds can be a lot higher than the high-pressure sodium lamp. 100 w LED, the output flux is only about 6250 lumens ( Through the secondary optical design, will have losses) , the number of lumens arrived at the road is still the 6000 lumens, and the average illuminance on the road can reach 16 lux ( 12 m high) 。 80 w leds can replace 250 w high pressure sodium lamp, mercury lamp or 300 w. The output of 250 w high pressure sodium lamp luminous flux is 20000 lumens. But to reach the road on the number of lumens only 7000 lumens. Intensity of illumination is about 30 - the road Coefficient of 40 lux, due to the color difference, the LED illumination correction coefficient of 2. 35 times, the correction coefficient of high pressure sodium lamp is 0. 94 times. So the 80 w LED the ground illumination for 37 after revised. Six lux, and high pressure sodium lamp of the adjusted illuminance for 28. 2 - 37. 6. The fairly. So, 80 w leds can replace 250 w high pressure sodium lamp, LED energy saving 2. 5 times.

in addition, the LED long service life, often do not need to change. High pressure sodium lamp design life 20000 hours, due to the high voltage change and the influence of the starting current, the actual life under 2 years. So its real life only 4000 hours, usually assumed to work 10 hours a day, only 400 days, a little more than a year to be replaced; And the life of the high power LED is 50000 hours, assuming work 10 hours a day, 13. Only need to replace 7 years. This will greatly save the maintenance cost.