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 lamps is stronger than that of high-pressure sodium lamps; 2. The solar street lamps have a unique secondary optical design, which irradiates the light of the solar street lamps to the required lighting Area, further improve the light efficiency, in order to achieve the purpose of energy saving; 3. The characteristics of the solar street lamp itself-the one-way light, no light diffusion, to ensure the light efficiency; 4. The light color rendering of the solar street lamp is better than that of the high pressure sodium lamp Much higher, the color rendering index of high-pressure sodium lamps is only about 23, while the color rendering index of solar street lamps is above 75. From the perspective of visual psychology, to achieve the same brightness, the illuminance of solar street lamps can be reduced by more than 20% than high-pressure sodium lamps on average, (refer to British principles Lighting standards); 5. The light attenuation of solar street lights is small, less than 3% in a year, and it can still meet the requirements of road use illuminance after 10 years of use, while the high-pressure sodium light attenuation is large, and it has dropped by more than 30% in about a year. , Solar street lamps can be designed with lower power than high-pressure sodium lamps; 6. Solar street lamps have automatic control energy-saving devices, which can achieve the greatest possible reduction in power and save energy when meeting lighting requirements at different times.