Solar street lights have a unique secondary optical design

Solar street lights have a unique secondary optical design 1. The light source efficiency of LED has reached 100lm/W at present, 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 of power. Therefore, the overall luminous efficiency of solar street lights is stronger than that of high-pressure sodium lamps; 2. The solar street light has a unique secondary optical design, which irradiates the light of the solar street light to the area that needs to be illuminated, further improving the light efficiency to achieve the purpose of energy saving; 3. The characteristics of the solar street light itself - the unidirectionality of light, no light diffusion, and ensure the lighting efficiency; 4. The light color rendering of solar street lights 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 solar street lights reaches more than 75. From the perspective of visual psychology, to achieve the same brightness, the average illuminance of solar street lights can be It is more than 20% lower than high-pressure sodium lamps (refer to British lighting standards); 5. The light decay of solar street lights is small, less than 3% in one year, and still meet the road use illumination requirements after 10 years of use, while the high-pressure sodium light has a large decay, which has dropped by more than 30% in about one year. Therefore, solar street lights in The power used can be designed to be lower than that of high-pressure sodium lamps;6. The solar street light has an automatic control energy-saving device, which can realize the greatest possible power reduction and save electric energy under the condition of meeting the lighting requirements of different periods.