Why LED street lamps can replace high power HPS lamps with low power
The efficiency of a glowing LED streetlight and a high-pressure sodium lamp are similar. Why LED street lamps can replace high power sodium lamps with lower power? How to repent? Here is a personal view, it can not be denied that there is imperfection, please ask me to correct.
High-pressure sodium lamps include a point of light source, which emits a 360-degree light. In fact, the light applied to the radiation is very small, only about 30%. Therefore, high pressure sodium lamps should reflect light in the direction of non irradiation through the reflector in the lamp, so as to achieve higher light utilization purposes. Due to the lamp design and cost issues, the efficiency of sodium lamps is only 40-45%. Why LED street lamps can replace high power HPS lamps with low power
Street lights / street lighting LEDs include light source areas, luminous surfaces are one way, high light source utilization rate, and lamp efficiency above 80%.
Here we take a 100W LED street light and a 250W high sodium pressure lamp as an example to illustrate this problem.
1. Luminescent flux of the LED street light 100w 11000lm start. Because the lens loss is 10%, the power loss is 10%, the luminous flux of the actual light is 8910lm, and the total power consumption of the 110W lamp. So the effect of this LED street light is 81lm / W.
2. The initial luminous flux of 250W high-pressure sodium lamp is 25000lm, loss of light source utilization is about 30%, power loss is about 20%, and the luminous flux is 12500lm, the total power consumption of lamp is around 300W. So the effect of this high pressure sodium lamp is 41,67lm / W.
Through the above analysis and comparison of ultimate luminous efficiency values, we can find that the lighting efficiency of the LED street light 100w is almost 2 times higher than the 250W high sodium pressure lamp. This is why a 100W LED streetlight can be used instead of a 250W HPS lamp Why LED street lamps can replace high power HPS lamps with low power