The subway is a means of electricity use, and it is also a real power-hungry king. At present, the global energy crisis is intensifying, and environmental pollution problems are becoming more and more serious. Energy-saving and energy-saving have become very important for subway transportation, and LED It is the best choice for energy saving and energy saving in subway lighting. I. Current status and prospects of subway lighting 1. Construction of metro cities, long operating mileage, rapid development, and huge metro lighting market. It is understood that there are more and more cities under construction or in line with the construction of subway projects, and the construction of subways in first-tier cities is even stronger. At present, there are more than 10 cities such as Beishangguangshen and Shenzhen, and more than 40 cities are under construction or preparation. In 2015, there were 97 domestic subway lines with a mileage of 3,087km and a station of 2,023. It is estimated that by 2020, 177 rail transit lines will be built with a total length of 6,100 kilometers and the total investment will reach 1,156.8 billion yuan. This will result in a large demand for LED lighting products. Looking at the world, the subway lighting market has expanded dozens of times. There are 62 countries in the world that have established urban rail transit, operating only 32,600 kilometers. Among them, subway mileage accounts for one-third. 2. The subway lighting upgrade and transformation market is large. LED lighting was initially applied to subway lighting in 2008, and only new subways in recent years have adopted LED lighting. In 2015, only Beijing Metro plans to replace 100,000 traditional LEDs with LED lights. Second, the design requirements of subway lighting 1, energy-saving and efficient: lighting system accounts for 13% of the total energy consumption of the subway power system, the average energy consumption of subway lighting is 26w / m2, far higher than the average standard of other places in the country 6w / m2, the source of energy-saving transformation is huge . 2, stable and reliable, long life: in the underground, high flow density, long lighting time, high intensity, high reliability and stability requirements for lamps, long life requirements. 3, lighting is divided into multiple levels: entrance and exit channels, station halls, platforms, cars, rails, due to natural light, flow density, comfort and other factors, the demand for lighting is not the same. 4, the design is complex, limited: the subway system includes strong and weak power systems, fire protection systems, operating systems, monitoring systems, exhaust systems, etc., lighting design not only needs lighting effects and human experience, but also needs to take care of other subsystems. 5, highlighting the artistic, cultural and urban style: the subway environment decoration more prominent the characteristics and style of the city, lighting design needs to be consistent with the environmental decoration style, from the background. 6, strong earthquake resistance: there is a certain vibration in the subway car, the platform and the station hall will vibrate when the train passes. Third, LED lamps are the first choice for subway lighting 1. The subway distribution system is complex, the voltage fluctuations are frequent, the working voltage range of the lamps is large, the lamps are more stable, and the LED lamps can achieve 100-240V, 85-265V. 2, subway lighting is used in closed spaces, lamps work longer, generally more than 17 hours. The traditional luminaires have a great light decay in this environment. The bare LED light source can be 5000H without light decay, and the whole lamp can be cooled and processed to achieve 5000H light decay of less than 1%. 3, the repeated maintenance of the lamps, will bring a huge workload to the subway operation, LED has a stable life of more than 50,000 hours; and can be designed as a simple maintenance method, is the first choice for subway lighting. 4. Electromagnetic interference will have an impact on the communication equipment in the subway, especially in the position close to the train operation. It is very important to avoid electromagnetic interference. Excellent solution design can control the electromagnetic interference generated by LED lamps very low. 5. As a subway for tunnel traffic, the operating area is full of wave-type vibration energy, and the anti-shock performance of the lamps is crucial. LEDs have a unique way of illuminating, and the luminaires are designed to have a special seismic structure. 6, the appearance of LED lamps has a very high design freedom, can create a unique atmosphere of the subway station. For example, the Guangzhou Metro's previous LED line renovation project: 14 subway stations across the line: Sanyuanli Station - Pazhou Station. It took two years and was officially completed in 2015. Before the transformation: 8790 sets of fluorescent lamps, after the transformation: 7527 sets of LED lamps, the total number of lamps: reduced by 1263 sets. The actual effect after the replacement: 14.4% less lamps, the illumination increased by 10%, the energy saving reached 48.8%, and the annual electricity consumption saved 2.45 million degrees. One-year comprehensive savings: 2.45 million 0.7526 = 1,848.7 million yuan, not included in the maintenance costs of fluorescent tubes. The cost of renovation will be recovered within three years. Fourth, the application space of subway lighting 1, import and export ladder lamp, downlight, plug-in tube 2, station hall lamp, panel light, three anti-lights, emergency lights, advertising lights, etc. 3, station lights, downlights, Panel lights, emergency lights, mining lights, etc. 4. Office, service center, duty room lamps, panel lights, ceiling lamps, etc. 5. Orbital internal tunnel lights, emergency lighting, three-proof lights, light strips, etc. Six anti-lights, etc. Summary LED lighting is currently the first choice for subway lighting systems, and the subway lighting system is also an area where LEDs must enter. It is of great guiding significance to expand LED lighting application fields, popularize green lighting, develop low-carbon economy, and formulate technical standards for LED lighting products. The research on LED lighting application technology will play an exemplary role.
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