Foreword:
With the launch of the ten-city Wanhao semiconductor lighting project and the increasing demand for energy conservation and environmental protection, 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 for the launch of the lighting application market. Under the continuous advancement of LED chips and packaging technology, LED has become the protagonist of lighting. More and more countries have formulated energy-saving and carbon-reduction regulations and lighting standards, which not only contribute to the development of the LED lighting application market, but also means that LED street lights will immediately become the innovative technology that dominates the road lighting source. 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.
Domestic LED street light market scale analysis
It is estimated that with the global economic growth, the global street lamp market will show a year-on-year growth trend. In 2010, the global street lamp market will reach 1.6 to 180 million baht.
Although the development speed of LED street lamps in 2009 is not as fast as expected, it will replace traditional street lamps. This is beyond doubt. Nowadays, many LED companies are competing to develop LED street lamps. Hundreds of them have already launched LED street lamps, but most of them have not yet achieved mass production. Compared with the enthusiasm of LED street lamps, China's LED street lamp market has not yet been launched in 2009. According to statistics, the scale of China's LED street lamp market in 2009 was only 200,000-300,000 baht. In the next few years, China's LED street lamp market still maintains a relatively fast market under the policy of slogans such as ten cities and thousands of miles. The development speed is expected to increase from 560 million yuan in 2008 to 3.96 billion yuan in 2012, with a compound annual growth rate of 63.0%.
LED street light cost competitive advantage
Although the LED street light is still three times more expensive than the high-pressure sodium lamp, under the factors of comprehensive power consumption and maintenance cost, after 2 years of use, the LED street lamp is almost equal to the total cost of the high-pressure sodium lamp. Therefore, in the long run, the cost of using LED street lamps will be better than current high-pressure sodium lamps. Compared with the high-pressure nano lamp, the 8-meter LED street lamp has a power consumption of about 250 watts and an LED of only 60 watts. In the service life part, the high-pressure sodium lamp averages about 4,000 hours, but the LED can last up to 50,000 hours. As the price of LED street lamps continues to decline, its competitive advantage will become more and more obvious.
LED street light source use efficiency
LEDs have high luminous efficiency. At present, the luminous efficiency of LEDs that can be purchased has reached 100 lm/W, and its luminous efficiency is much higher than that of energy-saving lamps, metal halide lamps and electrodeless lamps, which is 10% higher than the high-pressure sodium lamps commonly used in street lighting. Therefore, LED has now become one of the most luminous sources of luminous efficiency. Replacing incandescent, fluorescent, metal halide and high-pressure sodium lamps with LEDs no longer has major technical obstacles, just a matter of time.
LED street light development technical problems
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. 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. In the case of LED street lamps with relatively high technical difficulty, the problems caused by the lack of technical standards are particularly obvious. Many well-known LED manufacturers and integrators don't know how to design a practical street light, and the application department can't tell the specific requirements. For example, many manufacturers have designed a "short-type" lampshade to solve the problem of LED heat dissipation. However, for street lamps, such a model "wind and rain" has a poor function and is not suitable for street lamps.
Light source, heat sink and power system still need to be upgraded
Although the LED street lamp market is developing rapidly under the support of the government, it cannot be ignored that it is still facing severe challenges in order to truly obtain the long-term development of the LED street lamp market. At present, in addition to the high cost, the main problems faced by LED street lamp products include: light source, heat dissipation and power system.
From the perspective of the light source, on the one hand, it is necessary to further improve the luminous efficiency of the LED, and on the other hand, to improve the arrangement of the light source. At present, in a large part of the LED street lamp products on the market, the LED light source is arranged by a lattice structure. The biggest advantage of this method is that it is beneficial to solve the heat dissipation problem, but due to the insufficient lateral illumination distance of the structure, the light source distribution range Larger, it is impossible to achieve centralized light distribution of the reflector, and it is necessary to use a secondary lens to achieve independent light distribution. This requires high selection of secondary lenses. At present, secondary lenses of different materials have certain problems, which affects The effect of the product. If the treatment is not good, the use of the lens will also affect the lighting effect and clarity of the road surface.
In order to improve the above problems, some LED street lamp companies have introduced a light source using an integrated module. This type of light source package reduces the lack of one or several products that appear when the board is soldered and the finished product is working due to the arrangement of the light source. . In addition, since the concentrated light distribution can be realized by the reflector, the negative influence due to the use of the secondary lens can also be avoided. However, it is undeniable that the light source in this package will face more severe heat dissipation challenges.
From the perspective of power supply, unlike traditional lighting products, which can be directly connected to AC mains, LEDs are low-voltage driving devices and require constant current driving, which requires redesigning the power system of LED street lamps. At present, the cost of LED power supply accounts for about 10%-20% of the total product cost, and the power system will not affect the service life of the product to a large extent.
LED street light promotion application has a process
Application promotion is also the reason for hindering the development of LED street lights. Since there are no formal standard specifications for LED street lamps, several main parameters such as color temperature, color rendering and glare have not been determined, and LED street lamps cannot be fully promoted. Secondly, the high price of LED street lamps also brings great difficulties to the promotion and application of LED street lamps. In addition, the standard of LED street lamps and the road pavement test method standards for adopting LED street lamps have not yet been formulated. At this stage, the development of the LED street lamp market is mainly dependent on the government's strong support.
LED street light market prospects
From the current development status, due to the high price of LED street lamp products, the initial installation cost is more than 2 times higher than that of traditional street lamps, and the LED street lamps have to pass the economic benefits brought by the advantages of energy saving, long life and maintenance-free. Only afterwards can it be revealed that the long economic recovery cycle has brought certain obstacles to the large-scale market development of LED street lamps. At this stage, as the LED street lamp market is still dominated by pilot applications, the market development is mainly dependent on the government's strong support. However, if it is to be widely promoted, government support alone will be difficult to afford the high installation cost of LED street lamps, which is not conducive to the sustained and rapid development of the market.
(Edited from: Gaogong LED Editor to Peach)
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