On April 25th, 2009, Aladdin Lighting Network invited domestic authoritative experts to hold a rational call for the 2009 LED application product achievements and trends behind Shenzhen, to share high-level with LED lighting companies, designers and terminal owners. The wisdom of the results. The seminar was a lively discussion.
Regarding the future of LED, the audience and Zhao Haitian, professor of architecture at Shenzhen University, and associate researcher in electronic physics and laser devices at Shenzhen Graduate School of Tsinghua University; Qian Keyuan, deputy director of Semiconductor Lighting Laboratory of Shenzhen Graduate School of Tsinghua University; Dr. Yang Kangjiang, Foxconn, Fuchang Electronics representatives conducted a detailed discussion.
Cooling is not the most deadly problem with LEDs
Question: I am from Dongguan, specializing in radiators. Regarding the problem of LED heat dissipation, I would like to ask experts about how to look at the prospects of LED light radiators. Special heat dissipation materials are made of aluminum alloy and pure aluminum. There are even magnesium alloys. I would like to ask experts, which one is the best and what is the development prospect?
Qian Keyuan (( Qian Keyuan Aladdin Lighting Network Blog >> ) ): I just mentioned the radiator, I will talk about this idea, cooling is not the most deadly problem of LED, LED will definitely improve, increase to 80 -90% efficiency, the heat will be much smaller, experts who just engaged in construction have said that LED lights will go to two extremes, such as spotlights, of course, the ultimate ultimate goal is the projector. There is also reflection, the home lighting flood is the most comfortable, there is no need to screw a light bulb on the lampshade, if the floodlighting is definitely a large area, the pursuit of a large area, then heat is not a big problem, now light The effect is not so high. For example, if it is 200lm/w, the current lamp will be reduced by half. I think the heat dissipation will be more and more simple. I just talked about aluminum alloy, aluminum alloy and copper. I think the aluminum alloy is quite good. Of course, aluminum and cast aluminum may have some cost considerations.
Teacher Zhao (Zhao Haitian Aladdin Lighting Network Blog >> ): I recently read an article that the heat dissipation problem contains two layers of meaning. One is to compact your substrate and the heat shield outside your cover. The thermal resistance of the gap is the largest. Second, the outer cover and the external heat dissipation are two ways. One is radiating heat energy outward, and the other is convection heat dissipation. From our current situation, convection heat dissipation is the main one. How to increase the degree of convection heat dissipation? It is related to the roughness of the surface material and also the direction in which the material is placed. This is probably the case. Further specific technical issues may have to be discussed in private.
Test the water LED street light with yourself as a white mouse
Moderator (Aladdin Lighting Network Liu Jun): Just now the teachers of the research published their opinions. Dr. Yang Changjiang from Foxconn answered, Foxconn last year's Guangzhou International Lighting Exhibition, you advocate road lighting and garden lights, Foxconn's technology in heat dissipation How do you deal with the results? Can you share with you the core advantages of Foxconn's lamps compared to other similar products? Of course, the bottleneck can also be said.
Dr. Yang: There is no need to talk about advantages. Because there is no advantage, Foxconn has entered the lighting industry from the IT industry. The lighting industry has a lot of thresholds and industry knowledge. Foxconn has been in the LED industry for more than two years. I think I can provide it. Some of my experience and you share, we chose the street light as an entry point, Foxconn's factory area is many, you can use it as a white mouse, we from Shenzhen Longhua factory, to Yantai, Wuhan, Nanning and other factories according to the number Wan Hao, the longest time should be more than one year, and we have encountered a lot of problems. These problems are our bitterness in the difficulty of promoting street lamps just mentioned by Professor Qian. After we did it for a year, we felt that we had a first-come feeling in the interior lights. All of our factory lights were replaced with LED lights. From April this year, more than 10,000 shipments per month. Our own factory area, indoor lights and outdoor lights have a big gap, outdoor lights are currently applied in China CQC, QCQ is mainly in safety, CQC should be considered in China, LED street lamp energy-saving certification, as introduced in 2006 Efficient lighting, may be the third batch of streetlights, we are now paying attention to this. From the current preliminary plan, I think CQC's street lamp certification is in terms of energy saving. Energy-saving certification may be placed in the light effect. Because the standard of LED street lamps is introduced, the first production in Fujian last year, the third is Guangdong. The introduction of the street lamp standard will have some specifications for the design of the LED. It is necessary to think rationally behind the LED heat. It is absolutely impossible to replace the light bulb inside the traditional street lamp. Of course, the previous manufacturers pay a lot. The price.
The problem that we often foresee in the whole business promotion, LED light source is just a lighting industry, LED is just one of the new light sources. I personally feel that all our LED related standards will gradually be built in the original lighting industry. Modifications or additions to a special light source application. In addition, I want to raise it. I have read a lot of reports. LED street lights may be exaggerated. With the experience of Foxconn, we have 60%-70% of streetlights compared with traditional HPS. Energy saving, I think when reporters report, I want to give Aladdin Lighting a suggestion. When you write such an article, you may have to write assumptions and prerequisites, otherwise it will really mislead some users. I think there are a lot of bad impressions from many official organizations and users. We also encountered a lot in the promotion process. This is not the case with a demonstration. As far as the wooden barrel effect is mentioned by Professor Qian, I think it is a piece of LED driver. The LED light source guarantees 50,000 hours of basically no problem. Any manufacturer can guarantee that I see the local standards in Guangdong, I have participated, but In the later stage, I have seen an average life expectancy of 30,000 hours. In terms of the barrel effect, the LED driver is not like Foxconn. I can't guarantee 30,000 hours. There are also LED manufacturers and drive manufacturers. At present, manufacturers dare to guarantee 10,000 hours, and there are still many places to be worked hard, especially in LED drivers. Many people think that driving LEDs is very simple. A high school student and a high school student feel that they are not lit up. It is not easy to let the LED features play. I think this is the biggest worry in the electronics industry and in LED industry. As for other heat dissipation, it is our master project. LED itself is vertically integrated by Foxconn, and has strategic partnerships with some major international companies. This should avoid IT. The five big ones in IT already have copper walls. In China, we can't say that we are cottage LED street lights. I am from Foxconn in LED. There are two years in the industry, and a little experience is shared with you.
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