Since the launch of “Ten Cities and Ten Thousand Miles†in 2009, it has sparked everyone's enthusiasm for LED lighting. LED street lighting technology has become a hot topic, but this has not solved the problem of LED street lighting technology. At the "5th China LED Industry Theme Summit Forum" jointly organized by Gaogong LED and Tianjin Dongli District Government, many industry experts pointed out that LED street lighting technology faces many challenges, brought by Chen Hao, the chief technical officer of Ningbo Shuyuan. His LED street light technology solution.
In this forum, senior street lighting design expert Guangdong Zhaoxin Xu Liancheng said that at this year's Guangzhou Lighting Exhibition, some companies have worked hard on product research and development, and the products produced are gratifying. For street lighting design, Xu Liancheng reminds the industry to consider the wind resistance problem, "Let your street lights really stand in the wind and rain." Nowadays, the heat dissipation design of many street lamps does not take into account the problem of air convection, which causes the heat to be not actually exported, reducing the life of the LED.
At the same time, Xu Liancheng advocated modular design. He believes that modularization not only avoids the risk of high-power power, IP protection is easy to do, maintenance is as convenient as conventional street lights, greatly reducing the maintenance burden of enterprises.
Chen Haijun, chief engineer of Ningbo Liaoyuan, believes that white LED street lights can help improve road lighting safety. He believes that road lighting should not only consider central vision, but also the ability to detect peripheral targets. White LED street lights with short-wavelength blue light are more conducive to human eyes to detect surrounding objects.
He also believes that "in terms of street lamps, it is the key to reduce the interface thermal resistance and reduce the air gap." "There are actually fine air pockets due to the inherent flatness of the material surface. Because of the large thermal resistance of the air interface, It is not conducive to heat diffusion, so it greatly increases the overall interface thermal resistance."
Chen Daqing, director of the Tianjin Cityscape and Garden Management Committee, does not recommend using high-power LEDs above 3W as the light source for road lighting. The reason is that high-power LEDs are inevitably accompanied by the formation of large currents, which cause large heat and increase light decay. He told the participants that “the high-power integrated modules produced by several companies in China have achieved a luminous efficiency of more than 130Lm/W, the highest is close to 150Lm/W, and the temperature is controlled at around 50°C. In the second half, it reaches 160Lm/W. The above is indisputable."
Professor Luo Xiaobing from Huazhong University of Science and Technology pointed out that the heat dissipation problem of LED devices is a systematic problem. There are LED chip thermal resistance, interface material thermal resistance, diffusion thermal resistance, environmental thermal resistance, etc. "We should reduce all thermal resistance at the same time is the key to solving heat dissipation." He believes that by developing multi-layer ceramic technology and achieving integration and multi-function of LED packaging, reducing the size of LED packaging systems and reducing packaging costs are the main trends of CoB technology.
I personally think that the replacement of high-pressure sodium lamps by LED street lamps is a trend of energy saving and emission reduction in the future, but it will take time to test the progress of technology development. LED street lights should be developed and technology should be improved. I think that we need to pay attention to the following aspects: improving optical communication, making secondary optics, solving heat dissipation and modularization. Only after every step is done, the products that come out can be of high reliability and high quality.
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