The LED module is a module that arranges LEDs according to certain rules. It has relatively independent functions from mechanical, optical, thermal and protective. Because of its convenient configuration, it is widely used, with good heat dissipation and light efficiency. At present, some international major manufacturers such as Philips, Cree, Osram, etc. have been successfully developed and have been mass-produced. "LED modularization is the mainstream solution for high-power lighting in the future," said Chen Kai, deputy general manager of Xizi Optoelectronics.
Xizi Optoelectronics Co., Ltd. is a subsidiary of the Elevator Group. As the parent company of Xizi Elevator Group, Xizi United Holdings has a sales revenue of 15.8 billion yuan in 2010. It ranks 13th among the top 500 most competitive domestic private enterprises. A large-scale 500 company. In the past two years, Xizi United is embarking on industrial transformation, and cooperates with domestic leading industry leaders to focus on the development of green energy-saving industries. Xizi Optoelectronics, which uses LED lighting as its core business, will also take this opportunity to carry out a new round of industrial layout.
Attacking the LED lighting market with the advantage of the group
High-tech LED: Xizi Elevator Group is mainly engaged in the elevator industry. There are many dealers in the country. Does Xizi Optoelectronics intervene in the LED lighting industry based on its channel advantages?
Chen Kai: Xizi Elevator is the channel for dealers. There are more than 600 dealers and more than 200 core dealers in the country. Xizi Group's elevator sales have formed a good cooperative relationship with government departments and real estate developers over the years, which can become the basis for the development of Xizi Optoelectronics' lighting market. The establishment is also hoped to be able to sell LED lamps with the help of the original elevator dealer network, because elevator dealers have good cooperation with government departments and real estate developers, some commercial lighting, some shopping malls, office buildings, business centers, direct sales elevators. At the same time, you can sell LED lighting.
High-tech LED: What is the development model of Xizi Optoelectronics involved in LED lighting? With its original channel advantage, is it based on commercial photos?
Chen Kai: Xizi Optoelectronics was established in December 2008. Xizi Group itself is engaged in equipment manufacturing. The original idea (the foothold) is also from the application end, from public building lighting (street lights, tunnel lights, etc.) to commercial lighting. Then to the civilian lighting, but the market is developing too fast, public construction lighting is not as good as expected, the development of commercial photos has exceeded expectations, and currently mainly based on commercial lighting and street lamps.
LED modularization is the future development trend of high-power lighting
High-tech LED: LED module is considered to be a direction of high-power lighting in the future due to its good heat dissipation and light effect. When did Xizi Optoelectronics start this research?
Chen Kai: The quality of street lighting products on the market before 2009 was very bad. Xizi Optoelectronics conducted research on this, and analyzed the failure mode of street lamps of domestic large enterprises such as Qinshang and Foxconn. At that time, the streetlight scheme was cooling and waterproofing. There are many defects in the distribution of light, mass production, etc., so there is basically no successful experience that can be used for reference. Only the reverse mode is derived from the failure mode, that is to say, if all these bad phenomena are solved, what is it? Kind of solution. Finally, the conclusion that "the only feasible solution for LED street lamps is to take the modular road" is concluded.
High-tech LED: Heat dissipation is a big problem in current high-power products. Since LED module is the only feasible solution for LED street light, how does the LED module solve the heat dissipation problem?
Chen Kai: The LED module can solve the heat dissipation problem very well. A large heat sink will form a thermal eddy current in the middle, which is not conducive to heat exchange with the surrounding cold air. It is also intuitively understood that the larger the heat generating body is, the more difficult the heat dissipation is, and the smaller the heat generating body is, the easier it is because of the surrounding heat dissipation. If a large heating element is twisted into several small heating elements, the cold air flow can be taken between the small heating elements, the air is smooth, and the heat dissipation is natural. The use of air convection exchange for heat dissipation is currently the simplest and most cost-effective way to dissipate heat. If fans, heat pipes, hot plates, etc. are used to dissipate heat, the system becomes very complicated and the reliability is not high. To strengthen the heat convection, it is necessary to divide the module, so from this point of view, modularization can be said to be the most convenient and reliable solution to heat dissipation.
High-tech LED: The traditional street lamp uses the IP65 waterproof standard. Is the LED module the same?
Chen Kai: The IP rating of 65 is wrong, because the IP65 waterproof rating is for traditional lighting, while traditional light bulbs are generally not afraid of moisture. LEDs are electronic components, and they are very afraid of the tide. The LED components of the finished products will be vacuum-packed, and the moisture-proofing agent will be added inside. In addition, PCB boards such as aluminum substrates attached to LED devices are afraid of moisture, and the traces on the circuit boards are easily corroded and open to the road. Therefore, if the LED outdoor lighting IP level is not enough, the LED dead lights will affect the whole lamp. Life expectancy.
High-tech LED: What is the current waterproof level of LED modules?
Chen Kai: The IP rating of the traditional full-panel LED street light is difficult to improve, which is why the national standard intends to set the rating to IP65. However, if it is made into a module, the waterproof rating can reach IP67, or even IP68, to solve the waterproof problem. Xizi Optoelectronics' IP68 grade (2 meters underwater) LED module has received the report of the National Lighting Quality Supervision and Inspection Center. The traditional full-panel LED street lamp still has a breathing effect. When lighting, the hot air expands, and the air has an outward pushing force. When the light is on, the hot air contracts, and the air has an inward suction force. It is almost impossible to inhale the moisture, and it is almost impossible to get out of the moisture. Over time, the water droplets will condense in the lampshade. IP68 waterproof can cut off this breathing effect.
High-tech LED: At present, many companies are developing LED module light sources, some of which have been mass-produced. How about the progress of Xizi Optoelectronics LED modules?
Chen Kai: The first road test of Xizi Optoelectronics LED module street light was at the end of 2009, and it has been one year and five months since then. Under normal conditions of use, the street light actually does not last for a long time. In the 6000-7000 hours tested by Xiziguang circuit light, the junction temperature is controlled below 60 degrees, and there is basically no light decay. We use the method of accelerated aging in the laboratory to judge that our LED module can reach more than 50,000 hours. Because of the conclusion of accelerated aging, our products have been shipped in batches since the first half of 2010. So far, the customer feedback is very good, and the LED modules have almost never been returned. On the contrary, due to lightning strikes and other reasons, the power supply has some problems.
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