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Zhang Wansheng, Professor of the 13th Research Institute of China Electronics Technology Group
Peng Wanhua, Secretary General, Fujian Optoelectronic Industry Association
Fan Yuxi, Chairman, National Semiconductor Lighting Engineering R&D and Industry Alliance
Guan Jizhen, Chairman, LED Display Application Branch, China Optical Optoelectronics Industry Association
Liang Bingwen Chairman of Suzhou Najing Optoelectronics Co., Ltd.
Chen Hesheng, President of Anhui Wenrun Photoelectric Co., Ltd.
Li Mantie General Manager of Shenzhen Lehman Optoelectronics Technology Co., Ltd.
Ding Chenglong, General Manager, Beijing Dingshenglong Technology Development Center
Zheng Tiemin, General Manager of Shandong Inspur Huaguang Optoelectronics Co., Ltd.
Lu Rongqing, Deputy General Manager of Nanjing Handerson Company
Ye Likang Deputy General Manager of Xiamen Hualian Electronics Co., Ltd.
The potential huge economic and social benefits of the LED lighting industry have led countries around the world to formulate development plans and support policies to promote the rapid development of the LED lighting industry and market. China's "Electronic Information Industry Adjustment and Revitalization Plan" clearly states that it is necessary to vigorously develop energy-saving and environmentally-friendly LED lighting products. The Ministry of Science and Technology has officially launched the "Ten Cities and Ten Thousand Miles" LED lighting application project nationwide. However, LED lighting costs are currently high, and at the same time, there are a series of problems such as lack of standards, heat dissipation performance to be improved, and power supply drivers to be redesigned. To this end, the newspaper invited industry experts to make recommendations on how to promote the development of China's LED lighting industry in a healthy and benign manner.
Objective analysis to grasp the development focus of LED lighting
To have a comprehensive understanding of the connotation of LED lighting, we must objectively analyze the actual technical level of China's LED field, to rationally layout, and steadily promote the development and priorities of LED lighting.
In the technical field, support for material research and development should be increased, especially for high-power chip technology for lighting.
In the industrial field, we must pay attention to the display of application products, landscape lighting, public lighting, etc.
Peng Wanhua
At present, LED street lights have many technical problems, such as heat dissipation, light distribution, energy efficiency and system reliability, which have not been solved at the bottom, and the cost price is too high. It is not suitable for large-scale promotion and application, and demonstration projects should be carried out on the secondary roads. At present, the support of local governments is very strong, blindly launched, and they all support the development of LED street lights in enterprises in the region. Many enterprises do not understand the performance of LED street lamps. Blind investment will cause great waste. I think that in the next one or two years, the LED light efficiency will reach 120lm/w~130lm/w, the technical problems will be basically solved, and the cost will be greatly reduced. At this time, it is more suitable to promote LED street lights on a large scale.
Fan Yuxi
The Ministry of Science and Technology launched the "Ten Cities and Ten Thousands of Miles" semiconductor lighting application project, which has greatly promoted the development of the LED industry. In the specific implementation process, it is necessary to pay attention to several issues: First, LED street lights should be gradually promoted as new things, and the scope of application should be applied. It must be adapted to the current state of the art. It is possible to start with the community and the trunk roads. It is difficult to gradually promote the main roads and tunnels. Secondly, the streetlight demonstration should formulate corresponding technical specifications and testing methods. The expert group should be extensive and cover experts in the fields of lighting, semiconductor, electronics and materials. Once again, it is best to advance in two steps. The first demonstration period: highlight product quality, strictly control quality during the implementation process, encourage technological innovation, avoid price bidding, and should use product performance indicators, localization rate of products and corporate qualifications. As an important consideration; the second step of the market competition period: through several rounds of demonstration applications, to develop more complete LED street lamp specifications or standards, and to set higher technical thresholds and quality assurance thresholds for LED street lamp manufacturing enterprises, in order to follow The market mechanism organizes price competition.
Liang Bingwen
When advancing the application of LED street lamps, it should be noted that since LED luminous flux is almost linear with cost, and there is still much room for improvement in light efficiency, LEDs are not suitable for high luminous flux applications. The application of LED street lights should be focused on secondary roads, sidewalks, squares and gardens. Generally, the electric power of LED street lamps is preferably less than 150 watts, so that there is not much obstacle in terms of cost or handling of heat dissipation problems. When the time is ripe, it will be widely promoted to the main road and high pole lights. Areas such as San Francisco and Los Angeles are also promoting LED street lights, and their practices are relatively safe. Do experimentation, testing, and on-site assessments, then modify and quickly establish standards, which will reduce the negative impact of detours and avoid blindness. Once the pilot is successful, it can be quickly promoted on a large scale. These practices are worth learning from domestic counterparts.
Ding Chenglong
Be sure to pay attention to the false and true, beware of counterfeiting, be sure to select the product based on the data and reports of the third-party testing institutions recognized by the state, rather than abuse, do not break the reputation of LED lighting.
Li Mantie
The “Ten Cities and Ten Thousands†main streetlights are not suitable from the high-risk entry point of outdoor lighting, involving lumen efficiency, heat dissipation, optical problems, and life issues, all of which need to be improved. Since chip devices account for 50% of the total cost, large-size chips or devices used for street lamps are monopolized by foreign brands. The domestic epitaxial chip and packaging industry has limited benefits in the “Ten Cities and Ten Thousand Cities†project.
Zhang Wansheng
The main technical problem of the practical application of LED street lamps is that the total effective luminous flux required cannot be compared with that of high-pressure sodium lamps, and the reliability of the power LED devices used is not fully passed, and the price is too high in economics. Since the current white light power LED device products are limited by their luminous efficacy, they have not yet reached the point of real energy saving. Solar LED street lights use only green energy, but they are not environmentally friendly. They are installed in large quantities in places with alternating current. The existence of lead-acid batteries will bring disaster to human living environment. Therefore, the current LED street light should be in the trial stage, and the solar LED street light should be given the correct guidance.
After the Ministry of Science and Technology put forward the "Ten Cities and Ten Thousand Cities", some local officials vigorously promoted LED street lights in order to highlight their achievements in energy conservation and environmental protection, and installed solar LED street lamps in places with AC power. The lead-acid batteries of solar LED street lamps will bring environmental protection. Hidden dangers of pollution. "There is still a need to solve the problem." The Ministry of Science and Technology should immediately rectify and guide the domestic LED streetlight application to change the abnormal situation of the current LED streetlight application as soon as possible.
Guan Jizhen
As LED luminous efficiency has increased, as a new light source product, LED lighting has been popular in the world. In China, the development of LED lighting in recent years has also received strong attention from the government, investment and industry. Many cities have become semiconductor lighting industry bases, and many large cities are actively seeking to enter the “Ten Cities and Ten Thousand Cities†program of the Ministry of Science and Technology. At present, the development of China's LED lighting industry is indeed facing a rare historical opportunity. But objective analysis must grasp the key points of LED lighting development. First of all, we must have a comprehensive understanding of the meaning of LED lighting. Second, we must objectively analyze the actual technical level of China's LED field. Third, we must rationally lay out and steadily promote the development and priorities of LED lighting. I believe that in the field of technology, support for material research and development should be increased, especially for high-power chip technology for lighting. In the industrial field, we must pay attention to the display of application products, landscape lighting, public lighting, etc.
Technology development should be guided by market demand
Accelerate the formulation and promulgation of standards and norms, strengthen quality supervision and investigation, establish third-party testing and certification, and publicize and promote excellent products and enterprises.
To plan the overall chess game in the country, we must plan the industrial chain layout in different application areas, encourage technological innovation, and encourage the creation of a complete and competitive industrial chain.
Market leadership is the basis for the long-term healthy development of the LED lighting industry, and the development of technology should be guided by the needs of market applications.
Liang Bingwen
I believe that market leadership is the basis for the long-term healthy development of the LED lighting industry. Of course, the government should guide and support in many aspects such as policies, regulations, R&D investment, application demonstrations and standards. The development of technology should be guided by the needs of market applications.
Ye Likang
A good industry needs a good plan to guide development: First, we must plan the whole game of chess in the country, and plan the industrial chain layout in different application areas. Different regions should highlight different characteristics, and avoid duplicating the construction for short-term benefits, leading to future malignancy. Competition; secondly, establish norms or standards from the perspective of demand, develop quality assurance to meet the use, manufacturing standards, etc.; once again encourage technological innovation and encourage the creation of a complete and competitive industrial chain.
Ding Chenglong
As soon as possible, including the reliability indicators, there are assessment methods, and some advanced national standards.
Chen Hesheng
At least in the area of ​​public works such as street lamps, the domestic management and market operation system determines that the promotion of such products can only rely on government leadership. The products of civil use ultimately depend on the market, but the problem is that the advantages of long-life products of LED products are not easy to play out, so that their cost-effective advantages are not fully reflected, so the market space is relatively limited. . For this type of product, the real space will be more in industrial and commercial applications.
Li Mantie
LED research and development should be strongly encouraged.
The gap between China's LED level and foreign countries, one in the brand, two in the R & D investment. Foreign giants have gained a lot of profits due to high brand value-added, and have the strength to invest heavily in research and development. China's LED companies are still in the stage of entrepreneurial development, and the profit situation is not very good. The funds and manpower that are independently invested in research and development are not enough. . If the government can increase R&D investment support for outstanding enterprises in the domestic LED industry, it will be of strategic significance to the development of China's LED industry.
Guan Jizhen
At present, the government-led LED lighting promotion model has a positive effect on cultivating the industry, but it is not a model for long-term sustainable development. The LED lighting industry can have different models at different stages, but the long-term sustainable development model must be the market-led model. The initial stage can be government-led, and the intermediate stage may be technology-driven, but the establishment of the industrial base must be strengthened. The long-term development of the future will ultimately be dominated by the market.
High price constraints for large-scale applications
At present, LED lighting fixtures have failure failures, 70% are power problems, 20% are line and structural problems, and less than 10% are quality problems of LEDs themselves.
Due to the instability of the power supply and the problem of life, the life expectancy of the LED street lamp is greatly challenged.
With the advancement of technology, cost reduction and experience of demonstration projects, the conditions for the large-scale use of LED street lamps will certainly mature.
Liang Bingwen
It should be said that from the technical level, LED street lights are no problem, and the technology is mature. In terms of cost performance, as LED light efficiency continues to increase, prices are also rapidly declining, and LED street lights are increasingly advantageous. The so-called immaturity is mainly, first, the price is still high; second, because there is still a lot of work to be done on the standard and testing, there are a lot of "bad" products and samples on the market, these "inferior products" "The promotion of LED street lights has caused a lot of negative effects. Thirdly, due to the instability of power supply and the problem of life, the life expectancy of LED street lamps has been greatly challenged. For example, the early death of a large number of dead lights can be used." "It’s terrible," such a market blind behavior has caused incurable damage to the reputation of LED street lights. Fourth, the problems related to heat dissipation, if the design is not considered in place, or the design is correct, but the quality in the production process The problem is not strict, not serious, the heat problem is often a "soft rib"; Fifth, the market acceptance problem, this is a complex problem, it involves the municipal department's understanding of LED street lights, the government's management of street lights Policies (electricity, maintenance, construction, etc.), as well as conflicts between old and new interest chains.
Chen Hesheng
There are still some difficulties in the current large-scale promotion of LEDs. There are technical problems, but it is not the main cause: performance indicators and optical systems can have perfect solutions. Circuit and power problems can also be overcome or can be easily maintained. The higher cost is the fact, but the comprehensive line cost, use cost, longevity and maintenance cost, etc., currently have sufficient cost performance. The most important reasons for promotion are not the first one. The first is the problem of the LED industry's own standards. The problem of inferior engineering damage to the image of LED products is very likely to affect the confidence of customers and the market. Second, the construction, tube and maintenance separation that has been formed on the street lamps in China. The system is not conducive to the comprehensive and fair evaluation of LED products; the third is that the market operation system of the current street lighting project construction is bound to exclude new products.
Ye Likang
The main reason is that the cost of LED street lamps that meet the requirements of practical applications is too high, and the street lamps with large wattages have much room for improvement in terms of heat dissipation, overall lighting efficiency and reliability. With the advancement of technology, cost reduction and experience of demonstration projects, the conditions for the large-scale use of LED street lamps will certainly mature.
Zheng Tiemin
According to statistics, at present, about 70% of LED white light lighting failures are power problems, about 20% are line and structural problems, and less than 10% are the quality problems of LED single tubes. Choosing an efficient and reliable power supply is the key to energy savings in semiconductor lighting. Assume that the high-efficiency sodium lamp and LED street lamp have a luminous efficiency of 100 lm/W. Due to the strong directivity of the LED street lamp, under the same road illumination, it can save 50% of electricity (80% energy saving compared with incandescent lamps). A feature has been known to everyone. However, other characteristics of LED street lamps are superior to those of high-pressure sodium lamps, and have not attracted attention and utilization. For example, the controllable characteristics of brightness and the instant start characteristics of LED lamps have not been widely applied. We use these characteristics, through the control circuit can achieve time-sharing brightness control and when necessary, so that you can achieve 50% energy-saving indicators, so that the energy-saving effect of LED street lights is further enhanced.
Step by step development of LED lighting industry
To give full play to the advantages of LED color, low voltage and easy to control intelligently, it is often used in special applications where price is relatively insensitive.
For semiconductor lighting products, it is necessary to adopt the principle of development and application that is easy and difficult to start with, starting with landscape lighting, decorative lighting, etc., and then applying street lighting products, and finally developing and promoting LED general lighting.
Liang Bingwen
As a lighting source, the price of LED products is indeed very high, and there is still a long way to go to enter the ordinary people's families. But this does not affect the promotion of the LED lighting market, because the LED lighting market and the application itself are divided into different levels and sectors, and marketing is also a gradual process. The market and space before LED lights enter thousands of households is also huge. This is mainly for special areas of lighting or special lighting markets, such as landscape lighting, industrial lighting, backlighting, automotive lighting, railway lighting, and streetlights currently being promoted by the government. When the technology of LED has developed to a certain stage, its products have the advantage of cost performance in some markets, or when there are special highlights in some aspects, this market has opened its doors, for example, LED display, car taillights, Traffic lights, cell phone backlights, miner's lamps and current NB backlights, LCD-TV backlights, etc. The market and business opportunities before LED lights enter thousands of households are huge.
Li Mantie
The low-power LED devices used in LED indoor lighting have matured and 90% can be localized. The development of LED indoor lighting will drive the rapid development of China's LED industry chain, benefiting Chinese local LED companies currently in the entrepreneurial development period. Very good strategic significance. For example, LED fluorescent lamps have reached the eve of commercial promotion, because their prices are falling faster, technology is becoming more mature, energy saving effects are obvious (saving 60%), 90% can be localized, products can be standardized, and the number of uses is huge. Therefore, national policy Levels can be promoted and promoted. At present, a T8 LED fluorescent lamp, if it is illuminated within 24 hours, the cost of the initial multi-input can be recovered within one and a half years through the power saving fee, and has other advantages such as long life and no stroboscopic. This payback period will be further shortened as technology advances and prices adjust.
Peng Wanhua
At present, there are many problems in semiconductor lighting products, mainly due to lack of performance requirements, poor product quality, and high product prices. The main reason is that enterprises lack understanding of LED performance and lamps, and are eager to form products to the market for health. To develop semiconductor lighting products, first of all, according to market demand, and fully consider whether LED performance can meet the requirements, carry out serious research and development, testing, and strictly pass the system reliability test and assessment. After passing the qualification, it can be gradually pushed to the market. For semiconductor lighting products, it is necessary to adopt the principle of development and application of the first easy and difficult. Specifically, first, landscape lighting, decorative lighting, and long-lighting lighting are carried out, followed by commercial lighting, and then street lighting products, and finally develop and promote LED general lighting. At present, there are many kinds of LED lighting on the market, covering almost all lighting fields. Since many technical problems have not been solved, there are many problems and the price is too high.
Lu Rongqing
In recent years, with the development of the LED semiconductor lighting industry, more and more enterprises have joined, especially in the LED display industry. According to the LED Display Application Branch of China Optical Optoelectronics Industry Association, many LED display manufacturers have been involved in the LED semiconductor lighting industry. The transformation of these enterprises has its unique conditions, and there are also many inherent shortcomings. The problems are mainly manifested in production forms, technologies, processes and sales models. Semiconductor lighting involves LED semiconductors, optics, thermals, molds, arts and crafts. At present, a considerable number of companies are characterized by unprofessional optical design and semiconductor thermal design talents. The products are immature, simple imitation, low level of repetition, and no creative design. In terms of production form, LED display screens are engineering, non-standard, small-volume large-size electronic products, and semiconductor lighting products are mass-produced electronic products. Their production mode, quality control and reliability requirements are higher than those of display screens. More standardized enterprise production management. In terms of technology, LED semiconductor lighting has high requirements on the process, and requires scientific and complete process documents. The process is a production line of semiconductor lighting products. Only when there are reasonable process documents can there be qualified products, and it is possible to orderly produce. In the sales model, most LED display companies do not have a sales network. The direct sales model of the display screen is not suitable for semiconductor lighting products. The current sales model is not suitable for multinational lighting products manufacturers. At the same time, many companies in the industry blindly pursue a full range of products, resulting in products without features, and do not pay attention to the production of basic components, such as power. Therefore, for the transformation of the domestic LED display industry, it is recommended not to follow up blindly. The transformed enterprises should pay attention to process, quality, cost management and avoid disorderly price competition.
Ye Likang
Price and technology are the bottlenecks restricting the large-scale application of LED lighting. In 2003, Mr. Roland Haitz of LumiledsLighting proposed the Moore's Law of LED industry: LED will have a big improvement every 18 months to 24 months, and the cost will be A big decline, I believe that the days of LED products "flying into the homes of ordinary people" will come. During this transition period, it is necessary to promote the development of the LED industry by grasping applications. First of all, we must give full play to the advantages of LED color, low voltage and easy intelligent control, and enter the special application market where price is relatively insensitive. For example, night scene engineering, miner's lamp, medical, agriculture and other cities often follow the government-supported demonstration project. To promote the progress of LED lighting products. 