Advantages and Disadvantages of Using LED Street Lights

Now in cities, street lights can be seen everywhere, and they provide convenience and safety for our life every day. After a long period of development, LED lights are now mostly used in street lights. Compared with high-pressure sodium lamps, the use of LED street light has more benefits.

1.It is a unidirectional light source, without light diffusion, ensuring light efficiency.

2.The LED street light has a unique secondary optical design, which irradiates the light of the lamp to the area that needs to be illuminated, while this further improves the light efficiency to achieve the purpose of energy saving.

3.The luminous efficiency of LED has reached 110-130lm/W, and there is still a lot of space for development, with a theoretical value of 360lm/W. The luminous efficiency of high-pressure sodium lamps increases with the increase of power. Therefore, the overall luminous efficiency of LED street lights is stronger than that of high-pressure sodium lamps.

4. The color rendering of LED street lights is much higher than the high pressure sodium lamps. The color rendering index of high pressure sodium lamps is only about 23, while the color rendering index of LED street lights is above 75. From the perspective of visual psychology, to achieve the same brightness, LED light is more than 20% lower than high pressure sodium lamp.

5. The light decay of LED light is small, it is less than 3% in a year, and it still meets the road requirements after 10 years of use, while the high-pressure sodium lamp has a large decay, which has dropped by more than 30% in about a year. Therefore, the design of the power of the LED street light can be lower than high-pressure sodium lamps.

6. The LED street light has an automatic control energy-saving device, which can achieve the greatest possible reduction in power and energy saving under the condition of meeting the lighting requirements at different times. It can realize computer dimming, time period control, light control, temperature control, automatic inspection and other humanized functions.

7. It can be used for more than 50,000 hours and provides three-year quality assurance. But the disadvantage is that the battery life cannot be guaranteed.

8.Using chips ≥100LM, LED street light can save more than 75% of energy compared with traditional high pressure sodium lamps.

9. It′s easy to install, no need to add buried cables, no rectifiers, etc., directly connect to the light pole or nest the light source into the original lampshade.

10. Excellent heat dissipation control: The temperature in summer is controlled below 45 degrees, and passive heat dissipation is adopted, and the heat dissipation in summer is insufficient.

11. Reliable quality: All circuit power supplies use high-quality components, and each LED has individual overcurrent protection, so there is no need to worry about the damage.

12. Uniform light color: No lens is added, and uniform light color is not sacrificed to improve brightness, so as to ensure uniform light color without aperture.

13. LED does not contain harmful metal mercury, and will not cause harm to the environment when it is scrapped.

Combining the above principles, the energy saving effect is remarkable, and it can save more than 60% of electricity instead of high pressure sodium lamps.

14. Low maintenance cost: compared with traditional street lights, the maintenance cost of LED street lights is extremely low. After comparison, all input costs can be recovered in less than 6 years.

However, LED street lights are not perfect, and we still need to improve some problems.

1. A single LED has low power. In order to obtain high power, multiple parallel connections are required.

2. In fact, the color rendering index of LED is still low. The color displayed under LED illumination is not as true as that of an incandescent light. This must be analyzed from the spectral distribution, which is a technical problem.

3. There are light spots. Due to the defects in the manufacturing process of the white LED itself and the matching error with the reflecting cup or lens, it is easy to cause the ″yellow circle″ problem.

4. LED illumination uniformity problem. If the secondary optical design is not carried out, the illumination of the LED is relatively concentrated, so the secondary optical design must be carried out to make the light intensity distribution map look like a bat.

5. Compared with low-power LEDs, high-power LED street lights have much better light decay. However, low-power LEDs emit very little heat. The high-power LED has a problem that cannot be solved by heat dissipation, and the brightness will be significantly reduced after heating, so the power cannot be increased. The largest LED street light sold in the market is 360W.