LED street lamp is different from conventional street lamp. LED light source adopts low-voltage DC power supply, high-efficiency white light synthesized by GaN based power blue LED and yellow. It has unique advantages of high efficiency, safety, energy saving, environmental protection, long life, fast response speed, high color rendering index, etc. it can be widely used in the road. The outer cover can be made, with high temperature resistance up to 135 degrees and low temperature resistance up to - 45 degrees.1. Its own characteristics - the unidirectionality of light, no light diffusion, to ensure the efficiency of light.            2. LED street lamp has a unique secondary optical design, which irradiates the light of LED street lamp to the required lighting area, further improving the lighting efficiency, so as to achieve the purpose of energy saving.            3. LED has reached 110-130lm / W, and there is still a lot of room for development, with a theoretical value of 360lm / W. The luminous efficiency of high-pressure sodium lamp increases with the increase of power. Therefore, the overall luminous efficiency of LED street lamp is stronger than that of high-pressure sodium lamp (the overall luminous efficiency is theoretically, in fact, the luminous efficiency of high-pressure sodium lamp above 250W is higher than that of LED lamp).            4. The color rendering index of LED street lamp is much higher than that of 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 is more than 75. From the perspective of visual psychology, the illumination of LED street lamp can be reduced by more than 20% on average compared with that of high-pressure sodium lamp,.            5. The light attenuation is small, less than 3% in one year, and it still meets the road requirements after 10 years of use. However, the high-pressure sodium light has declined by more than 30% in one year or so. Therefore, the design of LED street lamp in use power can be lower than that of high-pressure sodium lamp.            6. LED street lamp has automatic control energy-saving device, which can achieve the maximum possible power reduction and power saving under the condition of meeting the lighting requirements of different periods. It can realize computer dimming, time-sharing control, light control, temperature control, automatic inspection and other humanized functions.            7. Long service life: can use more than 50000 hours, provide three years of quality assurance. The disadvantage is that the life of the power supply is not guaranteed.            8. High light efficiency: chip with ≥ 100lm can save more than 75% energy compared with traditional high pressure sodium lamp.            9. Simple installation: no need to bury cables, no need for rectifiers, etc., directly connect the lamp pole or nest the light source into the original lamp shell.            10. Excellent cooling control: the temperature is controlled below 45 ℃ in summer, and passive cooling mode is adopted, so the cooling guarantee in summer is insufficient.            11. Reliable quality: the circuit power supply adopts high-quality components, each LED has a separate over-current protection, no need to worry about damage.            12. Uniform light color: without lens, without sacrificing uniform light color to improve brightness, so as to ensure uniform light color without aperture.            13. LED does not contain harmful metal mercury, which will not cause harm to the environment when it is scrapped.            The energy-saving effect of the above principle is remarkable, which can save more than 60% of the energy by replacing the high-pressure sodium lamp.            Low maintenance cost: compared with traditional street lamps, LED street lamps have a very low maintenance cost. After comparison, the total investment cost can be recovered in less than 6 years.Power：20w /30W/50W/75WPF>0.95 Surge：KV>4.0 Voltage：85-410V Lumens：100-110LM/W