LED street light
LED street lights are semiconductor lights. It is a high-efficiency solid-state light source formed based on a semiconductor PN junction that can emit light with weak electrical energy. Under a certain forward bias voltage and injection current, the holes injected into the P region and the electrons injected into the N region diffuse to After the active area is recombined by radiation, photons are emitted, which directly converts electrical energy into light energy. It is a solid-state cold light source, which has the characteristics of environmental protection, no pollution, low power consumption, high luminous efficiency, and long life. Therefore, LED street lights will become the best choice for energy-saving transformation of road lighting. LED street lamps are different from conventional high-pressure sodium street lamps in that the light source of high-power LED street lamps adopts low-voltage DC power supply and is illuminated by GaN-based high-power high-power LED street lamps. The blue LED and yellow phosphor are combined with high-efficiency white light diodes, which are efficient, safe and energy-saving. , Environmental protection, long life, fast response, high color rendering index and other unique advantages, can be widely used in urban road lighting. The outer cover can be made of PC tube, high temperature resistance up to 135 degrees, low temperature resistance up to -45 degrees. Light Emitting Diode (Light Emitting Diode, abbreviated as LED) is a high-efficiency solid-state light source formed by a semiconductor PN junction that can emit light with weak electric energy. Under a certain forward bias voltage and injection current, it injects holes in the P area and injects N The electrons in the zone diffuse into the active zone and recombine through radiation to emit photons, which directly convert electrical energy into light energy.
Advantages of this paragraph
1. The characteristics of the LED street lamp itself-the one-way light, no light diffusion, to ensure the light efficiency.
2. The LED street lamp has a unique secondary optical design, which irradiates the light of the LED street lamp to the area that needs to be illuminated, and further improves the light efficiency to achieve the purpose of energy saving.
3. The light source efficiency of LED has reached 110-130lm/W, and there is still a lot of room for development, with a theoretical value of 250lm/W. The luminous efficiency of high-pressure sodium lamps increases with the increase in power. Therefore, the overall luminous efficiency of LED street lamps is stronger than that of high-pressure sodium lamps; Higher efficiency than LED).
4. The light color rendering of LED street lamps is much higher than that of 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 lamps is above 75. From the perspective of visual psychology, it can achieve the same brightness. The average illuminance of LED street lamps can be Compared with high-pressure sodium lamps, it is reduced by more than 20%, (refer to the British principle of lighting standards).
5. The light decay of LED street lights is small, less than 3% a year, and it can still meet the road use illuminance requirements after 10 years of use, while high-pressure sodium lights have a large decay, which has dropped by more than 30% in about one year. Therefore, LED street lights are in The design of using power can be lower than that of high pressure sodium lamp.
6. The LED street lamp 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. Spark smart LED street light can realize computer dimming, time-segment control, light control, temperature control, remote control, automatic inspection and other humanized functions.
7. LED is a low-voltage device. The voltage to drive a single LED is a safe voltage. The power of a single LED in the series is 1 watt, so it is a safer power supply than the use of high-voltage power supplies. It is especially suitable for public places (such as street lights). Lighting, factory and mine lighting, automotive lighting, civil lighting, etc.).
8. Each unit LED chip has only a small volume, so it can be prepared into various shapes of devices and is suitable for variable environments.
9. Long life: It can be used for more than 50,000 hours and provides three-year quality assurance. The disadvantage is that the life of the power supply cannot be guaranteed.
10. High light efficiency: Using chips ≥100LM, it can save energy by more than 75% compared to traditional high-pressure sodium lamps.
11. Easy installation: no need to add buried cables, no rectifiers, etc., directly install the lamp head of the street lamp on the lamp pole or nest the light source into the original lamp shell.
12. Excellent heat dissipation control: the temperature in summer is controlled below 45 degrees, and the passive heat dissipation method is adopted, and the heat dissipation guarantee in summer is insufficient.
13. Reliable quality: All circuit power supplies use high-quality components, and each LED has a separate over-current protection, so there is no need to worry about damage.
14. Uniform light color: No lens is added, and the uniform light color is not sacrificed to increase the brightness, so as to ensure the uniform light color without aperture.
15. LEDs do not contain harmful metal mercury, unlike high-pressure sodium lamps or metal halide lamps that are harmful to the environment when they are scrapped. Combining the above principles, the high-power LED street lamp has a significant energy saving effect, and it can save more than 60% of electricity instead of high-pressure sodium lamps. (To be studied) Low maintenance cost: Compared with traditional street lamps, LED street lamps have extremely low maintenance costs. After comparison, all input costs can be recovered in less than 6 years.
