With the increasing demand for energy conservation and environmental protection, and the launch of the Ten City Wanhao Semiconductor Lighting Project, China has basically determined the direction of LED outdoor lighting. Among them, LED street lights have attracted much attention and are regarded by the government as an important entry point to promote the lighting application market. Under the continuous improvement of LED chip and packaging technology, we can easily find that many elevators, buses, aircraft cabins, food and beverage outlets, and even the 2009 National Day military parade, many star concerts, all use LED as the lighting protagonist, shining Quartet. These landmark and iconic application events have highlighted the trend of a significant increase in the application of white LEDs in China. In addition, the issues of environmental protection and energy conservation have been valued globally, including North America, Australia, Japan and Taiwan. And lighting standard specifications will contribute to the development of the LED lighting application market. This also means that LED street lights will immediately become the innovative technology that dominates the field of road lighting sources. Therefore, people in 2009 have been hailed as the golden year for the development of LED street lamps in China.
According to experts' analysis: in 2008, the penetration rate of global LED street lamps was only 0.5%. It is expected that the penetration rate of LED street lamps will exceed 1% in 2009 and 2.15% in 2010. If each street lamp requires about 110 LEDs. In terms of quantity, it is estimated that the demand for LEDs for street lamps will increase by 167% compared with last year, and it is expected that the LED penetration rate will exceed 5%, which will be the time for rapid take-off. However, the question about whether the LED street lamp can reach the same level as the high-pressure sodium lamp and whether it is really energy-saving in practical applications has caused widespread debate in the industry, government, and research circles. For a time, the voice of praise and suspicion rose together to promote and coexist with the wait-and-see camp. In this regard, we have collected the opinions and suggestions of experts from different angles to analyze the LED street lamp industry, and strive to reveal the hot truth of LED street lamps for the majority of industry people, and to analyze the problems faced by key technology development.
Analyze the technical difficulties of LED streetlight development
With the blowout of the LED lighting market into the market, the development of LED street lights has become clear. The situation of many companies rushing to the LED street lamp market has been out of control. As a new type of solid-state light source, LED has shown energy-saving effects in more and more lighting fields. For example, instead of neon landscape lighting, energy saving can be 70%, and LED traffic lights can save 80% energy. It seems that high cost is not the only factor that hinders the entry and market of LED companies. What enterprises still need to overcome is the challenging problem of technical performance. Although the LED industry has developed rapidly in recent years, it still lacks authoritative technical standards, which has led to the unevenness of the entire industry and is very unfavorable for large-scale promotion. This is also the desire for LED technology to evolve faster than reality.
In the case of LED street lamps with relatively high technical difficulty, the problems caused by the lack of technical standards are particularly obvious. According to statistics, there are about 500,000 street lamps in Shanghai, of which about 350,000 are in urban areas. With semiconductor lighting, there is only a small section of the road section of Wuning Road. "Many outstanding LED manufacturers and integrators don't know how to design a practical street light, and the application department can't tell the specific requirements." Shanghai Semiconductor Lighting Engineering Technology Research Center, for example, many manufacturers in order to solve LED In the heat dissipation problem, a "short-type" lampshade was designed. However, for street lamps, such a model "wind and rain" has a poor function and is not suitable for street lamps.
Another reason that hinders the development of LED street lights is the application promotion. Summarized as follows:
1. Since LED street lamps currently have no formal standard specifications, they cannot be fully promoted. Among them, several main parameters of LEDs for street lamps such as color temperature, color rendering (color rendering index) and glare have not been determined.
2, the price of LED street lights is too high, the construction of street lamps is a multi-head system, which brings great difficulties to the promotion and application of LED street lamps.
3. The newly established street lighting design standard “City Road Lighting Design Standards” (CJJ45-2006) was implemented on July 1, 2007. There is no mention of the use of LED street lights. Here, the relevant departments should organize relevant personnel to seriously discuss whether the LED street lamps can meet the above design standards or what additional amendments need to be proposed as the formal standard specification requirements. It is recommended that the relevant departments organize the development of relevant standards for LED street lamps as soon as possible.
4. At present, there is no roadway test method standard for adopting LED street lamps. The standard for LED street lamps (including LED lamps) has not been established. The main parameters of LED street lamps are not included, including color temperature, color rendering index, glare, and luminous intensity (or illumination). Indicators for angles, angles, and thermal resistance and reliability are not required. It is recommended to establish a fair and authoritative LED street lamp related testing mechanism.
Government pushes against excessive dependence
Street lighting is a public project, and government investment is a key factor driving market development. However, if there is no added value or social benefit for any product, it is quite difficult to form a sound market by government investment alone. That is, the government may let the market surge in the evening, or it may disappear overnight, especially in China. In such a country with high policy enforcement, the market is more uncertain.
Recently, China's relevant government standards and plans have been proposed, so that most manufacturers are more optimistic about the size of the domestic LED street lamp market. However, in fact, many construction or government standards have a significant gap between the scale of implementation and the scale of the plan. Coupled with the entanglement of local interests, the expected market benefits that manufacturers can obtain remain to be seen. It is not appropriate to be overly optimistic and over-reliant. .
In short, LED street lights will face various difficulties, but from the test results of LED street lights in Shenzhen, the LED street lights have improved significantly, the light efficiency has improved rapidly, the overall lighting efficiency is over 80Lm/W, and the application efficiency is close to 50Lm/W. The application of the channel has been exposed; the level of light distribution is greatly improved, and the uniformity has an advantage over the high-pressure sodium lamp; the light attenuation problem is significantly improved, which is not inferior to other light sources. This also indicates that LED street lights will be an extremely fast-developing field in the LED lighting market. However, we must be happy too early. The problems exposed by color temperature (light color) still need to be highly valued. It is summarized into five major challenges:
1. Acceptance of LED white light;
2, the light color has a poor comfort (lower color temperature has a greenish problem, and the higher color temperature has a greenish purple problem);
3, the same model color temperature consistency is not good;
4. The uniformity of color temperature in different directions is poor;
5, the color temperature drift is more serious. If we have a new breakthrough in the research and application of color temperature issues, it is expected that by 2011, the city's LED street lights will reach 100,000
LED street lights will become the new darling of the road lighting market with its excellent environmental protection, reliability, energy saving and aesthetic design. It will bring new opportunities for the upgrade and revolution of the Chinese lighting industry.
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