Application of lighting in street lights

Lighting and LED are both rookies of green electric light sources. They have many similar characteristics, but they have different application fields. The lighting is arc discharge, and the LED light is solid light. The LED lamp has a low monomer power, and is currently mainly used for landscape, decoration, subtitle advertising and other lighting; while the lighting monomer has a high power, mainly for industrial and mining places and outdoor public lighting. Table 2 is a comparison of the performance and indicators of the two light sources. In the future, the two latest technologies of green lighting electric light sources will continue to develop on the basis of their respective light-emitting mechanisms, and will gradually replace most of the traditional light sources. Intermediate visual advantage of lighting There are two types of photoreceptor cells on the retina of human eyes, pyramidal cells and rod-shaped cells, and their functions are shown in Table 3. The vision in an environment with an environmental brightness of 10-2~10cdm2 is mediated vision, and pyramidal cells and rod-shaped cells jointly participate in mediated visual activities. The brightness of road lighting at night is between 03~10cdm2, which belongs to the intermediate visual environment. Because rod-shaped cells and cone-shaped cells have different spectral sensitivity, the maximum sensitive wavelength of rod-shaped body is 507nm, which is the peak wavelength of scotopic vision; the maximum sensitive wavelength of cone-shaped body is 555nm, which is the wavelength of photopic vision. In the case of intermediate vision, since the two work at the same time, and the degree of participation of the two cells at different brightness levels is different, there is no fixed peak wavelength. Under the condition of intermediate vision, the light source has an effective brightness coefficient range relative to the test brightness during photopic vision. The high-pressure sodium lamp contains more yellow light components (580nm), so the effective brightness coefficient of the intermediate vision is 08~09, and the lighting is ultraviolet ray to excite the three primary color phosphors to emit light. There are many bands, which are in line with the intermediate vision spectrum of night lighting, and the effective brightness coefficient in the intermediate vision is 13~15. In addition, studies have shown that the reaction time is related to the spectral composition of the light source. For light sources with more blue-green light in the radiation spectrum, the reaction time is shorter than that of the high-pressure sodium lamp, and the gap between the two increases as the adaptation level decreases. When driving a car at night, the shorter the driver’s reaction time to perceive the danger, the better. It can be seen that because the light spectrum is suitable for intermediate visual lighting requirements, it has good visual ergonomics under intermediate vision and dark vision, and is suitable for night lighting. The economic analysis of lighting used for road lighting The lighting level when lighting used for road lighting is arranged on one side, among which JZ135H and JZ85H are lighting models. The economic comparison of lighting and high-pressure sodium lamps is now taking a 200-meter-long road as an example to analyze the economics of using lighting and high-pressure sodium lamps on two roads with different widths. Table 5 lists two corresponding lighting solutions. If the lighting layout of the original high-pressure sodium lamp is not changed, only simple light source replacement is needed. Under the premise of ensuring the road lighting standard, not only can the electricity bill be greatly saved, but also due to the long life of the lighting, it can also reduce the maintenance cost, saving manpower, At the same time of financial resources, the safety factor is improved and the probability of accidents is reduced. Table 6 shows the economic analysis of the two schemes. The low color rendering index of the high-pressure sodium lamp makes the surface of the illuminated object blurred. In order to see the object clearly, it is easy for the driver to be in a state of high tension for a long time; and the high-frequency flash can cause the driver's fatigue, dizziness and other discomforts; and the high-pressure sodium lamp glare Seriously, it is easy to interfere with the driver's vision and affect normal driving. All of the above problems can easily cause accidents. At present, more than 80% of the road lighting lamps are high-pressure sodium lamps, but the theoretical analysis and experiments carried out at home and abroad show that the spectral characteristics of high-pressure sodium lamps do not conform to the intermediary visual characteristics of the human eye in the road lighting environment. The best light source. Lighting has the characteristics of high luminous efficiency, good color rendering, low energy consumption, low light pollution, long life, etc., and its spectral characteristics meet the visual characteristics of the human eye in the road lighting environment. Lighting is the best choice for road lighting at night.