Although LED has entered the field of rail transit lighting, it still faces many problems and challenges. Wang Gang, dean of Foshan Research Institute of Sun Yat-Sen University, pointed out that due to the operation of the car in rail transit, the control system uses wireless control, which puts high requirements on the electromagnetic compatibility of the lamp driving power supply, but there is still insufficient experimental data. In addition, the installation position of the lamps in the compartment is generally low, and the requirements for glare and emission brightness and uniformity of the lamps are higher than those of general indoor lighting products, but improving the uniformity and reducing the glare will greatly reduce the energy-saving advantages of the LED lamps. From the perspective of economic benefits of urban rail lighting, while obtaining a high uniformity and flexible surface light source, improving the luminous efficacy of the luminaire is the biggest challenge for LEDs to enter urban rail lighting.
In addition, the lack of standard specifications is also more prominent, there is no way to start the normal commercial procurement bidding process without standards. "LED lighting has entered the field of rail car lighting, but the relevant specifications and standards have not yet been established. It is also necessary to develop optical requirements such as cabin lighting, optical requirements and test standards for lamps, thermal requirements and test standards for lamps, power requirements for lamps and test standards. "Wang Gang said. Standards development requires sufficient experimental verification. At present, verification such as wireless signal control and device electromagnetic interference effects are not sufficient, and standard development will take time. However, after the completion of the subway, the transformation is very troublesome. Many new subway design stages have already taken into account the application of LEDs, which will promote the formulation of relevant standards and specifications. It is expected that some standard specifications will be gradually introduced in 2011, and LEDs will be marketed in rail transit lighting. The promotion is of great benefit. The metro lighting application market is relatively standardized. The key is to improve product quality after standard specifications are formulated.
Future forms of LED lighting products for rail transit lighting will be diverse. Wang Gang believes that the current interior lighting is mainly fluorescent tubes. In the future, some LED indoor lighting products may be used instead, and LED lamps and lanterns may appear in the exterior lamps. LEDs will play a big role in the construction of subway lighting atmosphere, new products will appear, but the overall will be consistent with the LED's modularization, personalization and other major directions. “LED lamps used in rail transit, especially in-car lighting, will be developed towards integrated integrated light source modules. This integrated integrated light source module is a multi-chip integrated light source integrated with an optical film with diffusion and light distribution functions. The shape of the light source of the package is sequentially arranged by the light source to form a seamlessly connected strip light source, and the brightness uniformity of the light source is solved from the package level," said Wang Gang.
In addition to the emerging application market, LED street lights are still the most important focus in the industry. Participants believed that more LEDs will be used in road lighting in the future, and the modularization of LED street lights will also become a development trend. Liu Muqing, a professor at the Institute of Electric Light Sources at Fudan University, pointed out that most of the current LED street lights are monolithic, with all the components being wrapped with a waterproof casing, which cannot be disassembled on site, but at the same time there are drawbacks such as difficulty in maintenance and inability to adapt to the development of LED technology. The light source module of the LED street light will help solve these problems. The light source module refers to the LED lamp, which is easy to disassemble and has the characteristics of waterproofing, light distribution and heat dissipation. The modular LED street lamp is composed of the light-emitting LED module, the driver and the outer casing. It is necessary to ensure that the light-emitting LED module is easy to maintain various properties, including protection performance, when disassembling. The LED street lamp industry chain after LED light source will also be composed of light source LED module, driver factory and street lamp factory. Wang Gang pointed out that for LED street lamps, how to regulate the LED street lamp market is an important proposition in the future. It is necessary to make efforts from standard specification, product quality certification system construction and contract energy management promotion.
It can be seen that with the development of semiconductor lighting technology, the application of semiconductor lighting in the field of transportation lighting is constantly expanding, and development is worth looking forward to.
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