On the road illumination of nano-ceramic cathode fluorescent lamps: LEC can quantitatively evaluate the suitability of an electric light source under a certain lighting condition, thus providing a reference for road lighting designers to choose a suitable electric light source. For example, when the nano-ceramic cathode fluorescent lamp is selected, the nominal luminous efficacy of the metal halide lamp and the high-pressure sodium lamp is 109 Lm/W, 80 Lm/W, and Lm/W, when the brightness level is higher than 0.1 cdm-2, the nano ceramic cathode fluorescent lamp The effective light efficiency is still higher than that of metal halide lamps. When the background brightness is 1 cdm-2, the theoretical calculation of the nano ceramic cathode fluorescent lamp has LEC=1.0, metal halide lamp LEC=0.47, and high pressure sodium lamp LEC=0.53, which confirms the reliability of the experiment. Key words: color rendering; light effect; nano ceramic cathode; visual sensitivity. I. Overview Road lighting has an important impact on reducing the incidence of traffic accidents at night. Studies conducted in various parts of the world over the past few years have shown that the illumination effect of the electric light source is 5000k. With the authority of the World Health Organization, good road lighting can reduce night traffic accidents by about 30%. Road lighting power accounts for about 20%-30% of total national lighting consumption. The choice of electric light source has a significant impact on the safety and energy saving of road lighting. The nano ceramic cathode electric light source is a patented technical product of an electric light source which emits phosphor light on the tube wall by a cathode-emitting electromagnetic wave made of a permanent ceramic material. The results of the scientific and technological information station in Jiangsu Province of China prove that the nano ceramic cathode electric light source technology has changed the technical principle, material and structure of the traditional electric light source. The brightness, color rendering and service life of the lamp have been greatly improved, and there is no precedent in the world. Prior to this patented technology, road lights that were commonly used almost all used high intensity gas discharge lamps. Such as: high pressure sodium lamps and metal halide lamps. Compared with these high-intensity discharge lamps, nano-ceramic cathode road lamps have higher luminous efficiency and color rendering index, lower energy consumption and longer working life (see table below): Table of typical nano-ceramic cathode roads Comparison of Photoelectric Parameters of Lamps and Metal Halide Lamps and High Pressure Sodium Lamps Name Nano Ceramic Cathode Fluorescent Lamp Metal Halide Lamp (MH) High Pressure Sodium Lamp (HPS) Power (W) 188 400 400 Lifetime (h) 30000 12000 10000-24000 Full Light Efficiency ( Lm/W) 109 85 115 Color rendering index (Ra) 85 69 20 Light efficiency at 5000k color temperature (Lm/W) 109 47 53 Luminous flux at 5000k color temperature (Lm) 20492 18800 21200
The above comparison results show that the nano ceramic cathode fluorescent lamp consumes less than half of the Other electric light sources, but the effective light efficiency is more than twice that of other electric light sources. In particular, the color rendering index reached 85, which shows that the use of nano-ceramic cathode fluorescent lamps as road lighting can not only greatly save energy, but also effectively improve the lighting environment. Humans are accustomed to recognizing colors in daylight in long-term production and life practices. Although the color temperature and spectral energy distribution of sunlight vary greatly with natural conditions, the recognition ability of the human eye is still accurate. This is the result of people's long-term practice of coloring memories in natural light. With the development of lighting technology, the development and utilization of many new electric light sources, people often recognize colors in different environments. Some lights are similar in color to daylight, such as fluorescent lights, mercury lamps, etc., but their spectral energy distribution is quite different from daylight. The sharp and bright road light technology of nano ceramic cathodes makes the service life of road lamps exceed 30,000 hours. The problem that the traditional road lamp has short service life and poor color rendering is successfully solved, and it is a replacement product of the road lamp electric light source. The use of high-intensity gas discharge lamps made of nano-ceramic cathodes instead of high-intensity gas discharge lamps is used for road lighting, and life expectancy is extended by 1.5 times in the case of 53% power saving. The same object can make the human eye produce different color sensations under different electric light sources, and the color of the object appearing in sunlight is the most accurate. Therefore, the daylight standard can be used as the reference electric light source, and the artificial electric light source is used as the electric light source to be tested, and the intensity of the same color capability is called the color rendering property of the artificial electric light source. In order to check the extent to which the color of the object under the electric light source to be tested coincides with the color developed under the reference electric light source, the "general color rendering index" is used as a quantitative evaluation pointer. The color rendering index is up to 100. For example, when you look at a picture in daylight and then take it down, you'll see that some colors have changed color. If the pink color turns purple, the blue color turns blue purple. Therefore, the "real" color is lost in the lower object. If it is observed under the low-pressure sodium lamp of yellow light, the blue color will become black, the color distortion is more severe, and the color rendering index is lower. Through the research on the new electric light source nano-ceramic cathode road lamp, it is found that in addition to the continuous color spectrum of the electric light source, the mixed electric light source composed of several specific wavelengths of color light also has a good color rendering effect. For example, blue light of 450 nm, green light of 540 nm, and orange light of 610 nm are mixed in a proper ratio to produce white light. Although it is highly discontinuous, it has good color rendering. We know that the color rendering of an electric light source is distinguished by the general color rendering index Ra value: Ra value is 100-85, color development is excellent, 85-75 color development is general, and color rendering property below 75 is poor. The color rendering and color temperature of an electric light source are two important color pointers. Color rendering is a measure of the visual quality of an electric light source, and color temperature is a pointer for measuring the color of an electric light source. If the color of the electric light source is within the color temperature range that people are accustomed to, the color rendering should be a more important indicator of the quality of the electric light source. This is because color rendering directly affects the color of objects that people observe. The ideal natural white light is theoretically composed of red, green and blue light, and the ratio of the three colors is 1:1:1. The light emitted by the artificial electric light source can be produced by mixing and matching three kinds of monochromatic lights of red, green and blue in different proportions. The amount of the three primary colors of red, green and blue required to match a particular electric light source is called the three primary colors of the electric light source, also called the tristimulus value of the electric light source. The reason why some electric light sources are yellowish and warm, some electric light sources are cold and green, which is caused by the uneven distribution of the tristimulus values ​​of the electric light source. From the perspective of energy saving, the first choice of electric light source is the light effect of the electric light source. However, from the perspective of safety, it is more important to consider the color rendering index of the electric light source. Previously, the recommended high pressure sodium lamp for road lighting was based on its high luminous efficacy of about 110 Lm/W. However, the light effect here is the data obtained under bright visual conditions. As the brightness level decreases, the visual function of the human eye will have a Purkinje shift. If the light effect under bright vision conditions is used to evaluate the road lighting conditions. The effect of the electric light source will produce a certain error. Recently, according to the characteristics of human visual nerves, it has been suggested that nano-ceramic cathode fluorescent lamps are more effective than metal halide lamps and high-pressure sodium lamps when the illumination level and other conditions are the same in peripheral detection, and are confirmed by reaction time experiments. According to the comparison of the relative spectral energy distribution of the nano ceramic cathode fluorescent lamp and the metal halide lamp and the high pressure sodium lamp with the human visual function, the qualitative analysis analyzes the change of the brightness level, and the light effect of the electric light source will change. Then, using the direct heterochromatic brightness comparison method in the range of 10 degrees X field of view, corresponding to the viewing function at different brightness levels, theoretically calculate the nano ceramic cathode fluorescent lamp, metal halide lamp, high pressure sodium lamp and in a certain Effective light efficiency at a specific brightness. The effective light effect is compared to the nominal light effect (the visual light effect listed on the catalog), and the ratio is called the effective light effect coefficient. On the basis of theoretical calculations, we used the field of view as an evaluation of the amount of peripheral detection capability of the driver. By simulating the night driving conditions, we compared the three electric light sources of nano ceramic cathode fluorescent lamps, metal halide lamps and high pressure sodium lamps. Changes in the subject's field of view under conditions. The experimental results confirm that nano ceramic cathode fluorescent lamps are more effective than metal halide lamps and high pressure sodium lamps in the influence of peripheral detection. This result is basically consistent with the calculated value of the effective luminous efficiency coefficient.
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The above comparison results show that the nano ceramic cathode fluorescent lamp consumes less than half of the Other electric light sources, but the effective light efficiency is more than twice that of other electric light sources. In particular, the color rendering index reached 85, which shows that the use of nano-ceramic cathode fluorescent lamps as road lighting can not only greatly save energy, but also effectively improve the lighting environment. Humans are accustomed to recognizing colors in daylight in long-term production and life practices. Although the color temperature and spectral energy distribution of sunlight vary greatly with natural conditions, the recognition ability of the human eye is still accurate. This is the result of people's long-term practice of coloring memories in natural light. With the development of lighting technology, the development and utilization of many new electric light sources, people often recognize colors in different environments. Some lights are similar in color to daylight, such as fluorescent lights, mercury lamps, etc., but their spectral energy distribution is quite different from daylight. The sharp and bright road light technology of nano ceramic cathodes makes the service life of road lamps exceed 30,000 hours. The problem that the traditional road lamp has short service life and poor color rendering is successfully solved, and it is a replacement product of the road lamp electric light source. The use of high-intensity gas discharge lamps made of nano-ceramic cathodes instead of high-intensity gas discharge lamps is used for road lighting, and life expectancy is extended by 1.5 times in the case of 53% power saving. The same object can make the human eye produce different color sensations under different electric light sources, and the color of the object appearing in sunlight is the most accurate. Therefore, the daylight standard can be used as the reference electric light source, and the artificial electric light source is used as the electric light source to be tested, and the intensity of the same color capability is called the color rendering property of the artificial electric light source. In order to check the extent to which the color of the object under the electric light source to be tested coincides with the color developed under the reference electric light source, the "general color rendering index" is used as a quantitative evaluation pointer. The color rendering index is up to 100. For example, when you look at a picture in daylight and then take it down, you'll see that some colors have changed color. If the pink color turns purple, the blue color turns blue purple. Therefore, the "real" color is lost in the lower object. If it is observed under the low-pressure sodium lamp of yellow light, the blue color will become black, the color distortion is more severe, and the color rendering index is lower. Through the research on the new electric light source nano-ceramic cathode road lamp, it is found that in addition to the continuous color spectrum of the electric light source, the mixed electric light source composed of several specific wavelengths of color light also has a good color rendering effect. For example, blue light of 450 nm, green light of 540 nm, and orange light of 610 nm are mixed in a proper ratio to produce white light. Although it is highly discontinuous, it has good color rendering. We know that the color rendering of an electric light source is distinguished by the general color rendering index Ra value: Ra value is 100-85, color development is excellent, 85-75 color development is general, and color rendering property below 75 is poor. The color rendering and color temperature of an electric light source are two important color pointers. Color rendering is a measure of the visual quality of an electric light source, and color temperature is a pointer for measuring the color of an electric light source. If the color of the electric light source is within the color temperature range that people are accustomed to, the color rendering should be a more important indicator of the quality of the electric light source. This is because color rendering directly affects the color of objects that people observe. The ideal natural white light is theoretically composed of red, green and blue light, and the ratio of the three colors is 1:1:1. The light emitted by the artificial electric light source can be produced by mixing and matching three kinds of monochromatic lights of red, green and blue in different proportions. The amount of the three primary colors of red, green and blue required to match a particular electric light source is called the three primary colors of the electric light source, also called the tristimulus value of the electric light source. The reason why some electric light sources are yellowish and warm, some electric light sources are cold and green, which is caused by the uneven distribution of the tristimulus values ​​of the electric light source. From the perspective of energy saving, the first choice of electric light source is the light effect of the electric light source. However, from the perspective of safety, it is more important to consider the color rendering index of the electric light source. Previously, the recommended high pressure sodium lamp for road lighting was based on its high luminous efficacy of about 110 Lm/W. However, the light effect here is the data obtained under bright visual conditions. As the brightness level decreases, the visual function of the human eye will have a Purkinje shift. If the light effect under bright vision conditions is used to evaluate the road lighting conditions. The effect of the electric light source will produce a certain error. Recently, according to the characteristics of human visual nerves, it has been suggested that nano-ceramic cathode fluorescent lamps are more effective than metal halide lamps and high-pressure sodium lamps when the illumination level and other conditions are the same in peripheral detection, and are confirmed by reaction time experiments. According to the comparison of the relative spectral energy distribution of the nano ceramic cathode fluorescent lamp and the metal halide lamp and the high pressure sodium lamp with the human visual function, the qualitative analysis analyzes the change of the brightness level, and the light effect of the electric light source will change. Then, using the direct heterochromatic brightness comparison method in the range of 10 degrees X field of view, corresponding to the viewing function at different brightness levels, theoretically calculate the nano ceramic cathode fluorescent lamp, metal halide lamp, high pressure sodium lamp and in a certain Effective light efficiency at a specific brightness. The effective light effect is compared to the nominal light effect (the visual light effect listed on the catalog), and the ratio is called the effective light effect coefficient. On the basis of theoretical calculations, we used the field of view as an evaluation of the amount of peripheral detection capability of the driver. By simulating the night driving conditions, we compared the three electric light sources of nano ceramic cathode fluorescent lamps, metal halide lamps and high pressure sodium lamps. Changes in the subject's field of view under conditions. The experimental results confirm that nano ceramic cathode fluorescent lamps are more effective than metal halide lamps and high pressure sodium lamps in the influence of peripheral detection. This result is basically consistent with the calculated value of the effective luminous efficiency coefficient.
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