Countries actively promote the implementation of energy saving and emission reduction projects, especially in China, LED street lamp manufacturers have attached great importance to LED street lamp because of its huge business opportunities. Street lamp is an important part of urban lighting. High-pressure sodium lamp is often used in traditional street lamp. The shortcoming of low light efficiency of high-pressure sodium lamp on the whole causes huge waste of energy. Therefore, it is very important to develop new high-efficiency, energy-saving, long life, high color rendering index and environmental protection street lamp for energy saving of urban lighting.
Today's LED Street Lamp features:
High-power LED street lamp is different from conventional high-voltage sodium lamp. The light source of high-power LED street lamp uses low-voltage DC power supply, high-efficiency white light diode composed of GaN-based power blue-light LED and yellow phosphor. Light Emitting Diode (LED) is a high-efficiency solid-state light source based on semiconductor PN junction, which can emit light with weak electric energy. Under bias voltage and injection current, the holes injected into P region and the electrons injected into N region diffuse into the active region and emit photons by radiation recombination, which directly converts electrical energy into light energy.
As the light source of street lamp, LED has many advantages compared with traditional street lamp.
1. LED street lamp itself has the directivity of light, no light diffuse, to ensure light efficiency;
2. The LED street lamp has a unique secondary optical design. It illuminates the illumination area of the LED street lamp to the required illumination area, i.e. the road surface, which further improves the illumination efficiency and achieves the goal of energy saving.
3. The light source efficiency of LED has reached 100 lm/W at present, and there is great room for development. The theoretical value can reach 250 lm/W. The luminous efficiency of high-pressure sodium lamp increases with the increase of power. Therefore, the overall light efficiency of LED street lamp is stronger than that of high-pressure sodium lamp.
4. LED street lamp has a higher color rendering performance than high-pressure sodium lamp. The color rendering index of high-pressure sodium lamp is only about 23, while the color rendering index of LED street lamp can reach more than 75. Considering from the perspective of visual psychology, the brightness of LED street lamp can be reduced by more than 20% on average than that of high-pressure sodium lamp (refer to British road lighting standards); moreover, under the level of intermediate vision, the human eye is exposed to high-color and high-temperature environment. It is easier to distinguish things in low color temperature environment than in low color temperature environment, which avoids the occurrence of some dangerous conditions.
5. LED street lamp's light decay is small, less than 3% in one year, and it still meets the road illumination requirement after 10 years'use. Therefore, the design of LED street lamp's use power can be lower than that of high-pressure sodium lamp.
6. LED street lamp can automatically dim light, meet the lighting requirements of different periods, reduce power as much as possible and save electricity.
7. LED is a low-voltage DC device. The voltage driving a single LED is a safe voltage, so it is a safer power supply than using high-voltage power supply, especially suitable for public places. The characteristics of DC make LED especially suitable for combining with solar energy and wind power.
8. The crystal size of each LED unit is very small, so it can be fabricated into devices of various shapes, and it is suitable for the changeable and earthquake-prone environment.
9. Long life: theoretical life can be used for more than 50,000 hours;
10. LED can be switched on and off frequently without fear of damage.
11. Easy to install: directly install LED street lamp holder in lamp holder to replace original sodium lamp holder
