Problems and challenges of LED in the field of urban rail transit lighting

Although LED has entered the field of rail traffic lighting, still faces many problems and challenges. Wang Gang, Dean of the Zhongshan University Foshan Research Institute pointed out that as the carriage rail traffic in the running state, the control system using wireless control, put forward high requirements on electromagnetic compatibility of the lamp driving power, but there is a lack of sufficient experimental data to support; in addition, the lamp inside the installation position is generally low, the glare and the output brightness is higher than the general requirements of indoor lighting products, but improve the uniformity, reduce glare will make LED lighting energy-saving advantage is greatly reduced, from the city track lighting the perspective of economic efficiency, high uniformity, flexible surface light source at the same time, to improve the light efficiency is the biggest challenge of LED into the city track lighting the.

In addition, the lack of standards and norms are also more prominent, there is no standard there is no way to start the normal commercial procurement bidding procedures. "LED lighting has entered the orbital compartment lighting field, but the relevant norms and standards has not been established, also need to develop such as car lighting optical requirements, lighting optical requirements and test standards, requirements and testing standards, heat lamps lamp power requirements and test standards." Wang Gang said. The development of the standard requires full experimental verification, such as the control of wireless signals, such as the impact of electromagnetic interference is not very good, it is necessary to develop standards. But the subway after the completion of the transformation is very difficult, a lot of new subway design phase of LED has been applied into consideration, will promote the formulation of related standards, is expected to start in 2011 will gradually have some standards promulgated, is good for LED in rail transit lighting market, subway lighting applications market is relatively standardized, the key lies in the establishment of the standards, improve the quality of products.

LED lighting products will be used in the future rail transit lighting products will be diverse. Wang Gang believes that the current car lighting with fluorescent lamp, may use some LED indoor lighting products to replace cars in the future, there may be external lamp LED lamp etc.. LED will play a great role in the construction of the subway lighting atmosphere, new products will appear, but the overall experience with the LED module, personalized and other major directions. "LED lamps used in rail transport, especially the compartment lighting to the integrated light source module development, this integrated light source module is the source form of multi chip integrated light source with diffusion, light distribution function of optical thin film encapsulation, this light source arranged sequentially, forming a light bar seamless connection, solution light brightness uniformity from the package level." Wang Gang said.

In addition to emerging applications market, LED street is still the industry's most important focus. Participants believe that in the future there will be more LED used in road lighting, and LED street lighting module will also become the development trend. Institute of Fudan University professor Liu Muqing pointed out that the current electric light source, LED lamp for the majority of integral type, all with a waterproof shell wrapped with all the components, features cannot be disassembled, but there are also maintenance difficult, unable to adapt to the development of LED technology and other defects. The LED street light source module will help solve these problems. The light source module in LED lamps, the LED containing and easy disassembly, and has waterproof, light distribution and heat dissipation characteristics of modular LED lamp by the LED light source module, driver and shell parts, designed to ensure LED light source module to keep the performance easy in disassembly, including protective performance. The LED light source after the LED street light industry chain will also be light source LED module, drive factory and street lamp factory, etc.. Wang Gang pointed out that in LED street, LED street in the future how to regulate the market is an important proposition, from the standard specification, construction, efforts to develop product quality certification system of energy management contract extension etc..