LED street lights have entered the "post-cost-making era", the core of the "core" in the 10 years of light decay is less than 20%

With the improvement of LED chip and driving power technology, problems such as heat dissipation, light decay, and power supply of LED street lamps have been solved, and the continuous rapid decline in price has improved the cost performance of LED street lamps.

Domestic LED street lamps gradually replaced traditional street lamps as the main force for newly installed street lamps. At the same time, the intelligent control features of LED street lamps in the future have strengthened the advantages of LED street lamp products. Under the current background of energy saving and emission reduction, local governments are widely promoting LED street lamp products.

According to the research data of the High-tech Research Institute LED Research Institute (GGII), benefiting from the collective recovery of the domestic LED market, the domestic LED street lamp market in 2016 reached 9.46 billion, an increase of 15.4% year-on-year. By the end of 2016, the domestic LED street lamp penetration rate was close to 30%. . GGII expects domestic LED street lamp penetration rate to be close to 40% by the end of 2017.

Fujian Zhongke Core Source Optoelectronics Technology Co., Ltd. (hereinafter referred to as “Zhongke Core Source”) is the leading ultra-high-power professional lighting solution service provider in China. After a large number of user surveys, Zhongke Core Source adjusts the R&D plan in road lighting. A large amount of funds were invested, and a new road lighting product series, the T1 series, was launched for the replacement mode and the contract energy management mode, including street lamps, tunnel lights, and high pole lights. The products are mainly used in trunk roads, secondary trunk roads, and branch roads. Intersection area, tunnel lighting, etc.

Factors affecting the life of LED street lamps

Yang Yanhui, director of marketing of Zhongke Core Sources, revealed that through our survey of customers, the following four factors affect the service life of LED street lamps:

First, the degree of protection is invalid: many water lamps appear in the light source cavity, and the disassembly finds that due to the long-term outdoor environment, the original sealant has yellowing, aging, and viscosity reduction. Due to the breathing effect, water vapor enters the light source cavity. Water drops. In addition, due to the entry of water vapor, the SMD lamp bead is short-circuited, and a single light source is short-circuited, causing a series of disconnection, causing some of the lamps to die. The harmful gas enters and causes the surface of the light source to sulphide and corrode, and the colloid cracking causes the gold wire to break. Dead light

Second, insufficient heat dissipation: The investigation found that most of the heat sinks used in the lamps, in order to save cost, the heat dissipation area is insufficient, the cooling and heating ratio is out of the reasonable range, leaving insufficient heat dissipation for the light source, resulting in excessively high working temperature of the lamps;

Third, the power supply: We found that most of the lighting power supply is exposed outdoors for a long time, and there is no protection for the power supply. Many lighting manufacturers have a misunderstanding of the IP67 protection level of the power supply. It is believed that the IP67 can be directly exposed to the outdoor environment. In fact, the IP67 rating The test standard is that the underwater power can be passed after 1 minute of powering for 1 minute. The simpler test is easier to pass. When the street light power supply encounters rain in the working process, the cooling will produce a breathing effect. The water vapor will enter the power supply and cause short circuit of the PCB. The power supply fails; the water vapor also causes the potting glue to peel off from the aluminum shell, which reduces the internal temperature rise of the power supply caused by the heat conduction; it also finds that the power supply of the lamp directly fits on the heat sink, and does not take into account the heat of the heat sink superimposed on the power supply, the power supply temperature per Increasing 10° will reduce the service life by half, and the failure rate will increase by 20%. This is because the characteristics of the electrolytic capacitor are determined. The life of the Japanese electrolytic capacitor is 105°, and the life is 10000h. And vice versa will reduce the life expectancy, Infineon power supply product quality assurance will be marked inside the warranty shell temperature, temperature

Fourth, light decay: I chose a lamp that has been used for 3 years. The measured ground illumination is 40% different from the initial value. There are many factors that cause light decay. The first is the light source light decay. The reason is the attenuation of the light source chip itself. The chip manufacturer gives the data that the domestic chip withstand junction temperature is 125 ° imported chip is 145 °, to ensure that its theoretical lifetime can reach 50000h under the withstand junction temperature, some street lights in use color temperature is getting higher and higher, from the initial 6000K becomes 7000k and even blue light, especially after snowing in the north, can create a chilly atmosphere, causing the color temperature to rise because the principle of LED illumination is that the blue chip excites the phosphor to emit white light, if the phosphor efficiency is lowered Excessive blue light will be emitted, causing the color temperature of the lamp to rise, causing the phosphor to fail due to the high temperature of the light source and the attenuation characteristics of the phosphor itself. Secondly, the light transmittance of the lens is reduced due to lens aging. The street lamp products use PC lens, which is exposed to ultraviolet rays and automobile exhaust in the outdoor environment, causing the yellowing of the product to affect the light transmittance, resulting in

“In addition, we also found that many northern streetlight management departments prefer to use low-color street lights. After communication, it is found that low-color street lights can improve the recognition of the road range in snowy days. 2200K is more comfortable than 6000K. Previously, low-pressure sodium lamps and high-pressure sodium lamps were mainly used. The discharge radiation of low-pressure sodium lamps was concentrated on two double-D lines of 589.0 nm and 589.6 nm, which are very close to the highest value of human visual curve (555 nm), low-pressure sodium lamp radiation single. Color yellow light, its radiation spectrum is pure, stable, no stray light, the wavelength of light is foggy, so low-pressure sodium lamp is also suitable for lighting in foggy areas; for low-pressure sodium lamp, the monochromaticity is too strong, the color rendering is very poor The high-pressure sodium lamp developed by the short circuit of the discharge tube and the low-pressure sodium lamp have the characteristics of high color rendering index and long service life, and also have high penetrability, and the color temperature is mainly between 2200-2500K. The biggest advantage of sodium lamp application in road lighting is the ability to penetrate rain, snow and fog.

Because the LED display height can improve the object recognition, the overall road traffic safety can be improved. Yang Yanghui said.

Solving the problem of LED street lamp life

In response to the above problems, Zhongke Core Source has developed T1 series street lamps. The protection level of the whole lamp can reach IP66. The sealing is made of silicone pressure ring without colloid, which eliminates the protection failure caused by colloid aging. The independent electrical cavity can protect the electrical appliance. And the internal cables are not eroded by the external environment.

For the first time in the heat dissipation of the power supply, the integrated conduction design can reduce the operating temperature of the power supply by more than 10°. In the light source, the KCOB light source is used in its own package. The KCOB uses a transparent fluorescent crystal as the packaging material. The material is sintered at a high temperature of thousands of degrees. It has no phosphor, and the material has good thermal conductivity to achieve lateral heat conduction. Combined with 3D three-dimensional packaging structure, it can realize double-channel heat conduction.

At the same time, the surface of the transparent fluorescent crystal is treated by microstructure, which improves the light extraction efficiency by more than 5% compared with the colloidal package. The bidirectional heat conduction makes the temperature of the light source TC point 60-70 ° C, ensuring that the junction temperature of the chip is below 125 °, making it work at the most Good state; the lens is made of high-boron glass material, which can eliminate the influence of ultraviolet light and various gases. The light effect will not be affected by the lens during the life cycle of the lamp. The 10-year light decay index of the whole lamp can be controlled within 20%, while the low color temperature of 2200K is controlled. The color temperature closest to the sodium lamp is significantly higher than that of the sodium lamp, and the light efficiency is 120 lm/w. It is the best choice for EMC contract energy management projects.

At present, the case of Zhongke Core Source LED Street Light Project is mainly concentrated in contract energy management projects and energy-saving renovation projects, and has been applied in more than ten countries including Fuzhou High-tech Zone, Youxi County, Lianjiang County, Philippines, and Domenica. .

Yang Yanhui said, "Zhongke core source TI series LED street light is similar to the traditional high-pressure sodium lamp, the color temperature is similar to the original sodium lamp color, and the uniformity of design through the light distribution is greatly improved. Under the condition of meeting the national standard, the power saving rate can reach more than 60%. And low color temperature is high to improve road clarity and road traffic safety."

Optimize the level of LED street lamp maintenance

Recently, Zhuhai Municipal Bureau of Municipal and Forestry Bureau organized the Municipal Urban Construction Facilities Management Center to carry out the preparation of the “Guidelines for the Maintenance Costs of Urban Lighting Facilities in Zhuhai City (Trial)” (hereinafter referred to as the “Guidelines”), and has now formed the results of the approval and is on its official website. It is publicized to the public for one month.

Urban lighting maintenance work mainly includes power distribution facilities, line facilities and lighting facilities. It is understood that the applicable period of the pilot trial standard is tentatively set at three years. After the country or industry has issued corresponding indicators, it will be adjusted according to the situation.

The specific custody funds in the “Guidelines”: “The warranty price of the LED street lamp during the warranty period (excluding lamps) is 270 yuan/盏·year, and the unit price of the LED lamp maintenance outside the warranty period is 405 yuan/盏·year ( Includes replacement bulbs and power supplies, as well as labor, machinery and materials, etc.).

According to Yang Yanhui, "Whether LED street lamps can continue to be used depends on whether the light decay is greater than 30%, KCOB street lamps can guarantee 10 years of light decay below 20% (providing lifetime warranty service). It is understood that the current power supply warranty time on the market is In the past five years or so, by reducing the power supply operating temperature and reducing the power failure rate, some manufacturers have placed the power supply on the lamp post inspection port to reduce maintenance costs."

Intelligent street lamp construction will welcome rapid development opportunities

Nowadays, smart cities gradually move into the stage of substantive construction from concept exploration. With the accelerated development of smart cities and the widespread application of new generation information technologies such as Internet of Things and cloud computing, the construction of intelligent street lamps will usher in rapid development opportunities. It is estimated that by 2020, the penetration rate of China's LED intelligent street lamp market will increase to about 40%.

In Yang Yanhui's view, "LED lighting has now become a standard substitute for traditional street lighting in most cities in the world, and intelligent control is beginning to become more widespread and gradually deployed with LED lighting. Many cities around the world are likely to In the longer-term process, the existing street lamps are replaced by new and more efficient LED lighting equipment. The intelligent control of LED street lights can increase the energy-saving efficiency by 15% on the basis of the existing 60% energy saving, and the intelligent control can realize the on-demand lighting. It is able to integrate existing street lamp resources to build an IoT platform, manage manhole covers, trash cans, monitoring, billboards, etc. through street lighting IoT. Smart lighting is the future direction of LED street lights."

Indeed, street lamps have the characteristics of following the roads and streets of the city, such as blood vessels and nerves covering the body of the city, and the street lamps have the characteristics of "net, a little, pole", which is the main carrier of the smart city, so Smart streetlights will be the first site for intelligent urban transformation and the main threshold for the city to move towards a smarter process.

In the future, with the widespread application of next-generation information technologies such as Internet of Things, 5G networks, and cloud computing, smart cities have become an inevitable trend, and smart street lights, as an important part of smart city construction, will not only receive strong policy support, but also Welcome a broader space for development.

In the ever-evolving landscape of urban development and sustainability, the adoption of LED street lighting has emerged as a pivotal trend. These energy-efficient lighting solutions have not only revolutionized the way we illuminate our streets but have also paved the way for greener, more sustainable cities. In this article, we delve into the key insights and findings from the 2017 China LED Street Light Industry Research Report, shedding light on the trends, challenges, and prospects that have shaped this transformative industry.

1. The Rise of LED Street Lighting in China

The 2017 China LED Street Light Industry Research Report marked a significant milestone in the country's journey toward energy-efficient urban lighting. LED technology, with its exceptional energy efficiency and longer lifespan, gained prominence as the preferred choice for street lighting, surpassing traditional options like high-pressure sodium (HPS) and incandescent bulbs.

2. Energy Efficiency and Sustainability

One of the primary driving factors behind the widespread adoption of LED street lights in China was their remarkable energy efficiency. The report highlighted that LED lighting consumes significantly less energy than conventional lighting technologies, resulting in substantial cost savings for municipalities and reduced carbon emissions. This aligns with China's commitment to reducing its carbon footprint and creating environmentally sustainable cities.

3. Cost-Effectiveness

The report also underscored the cost-effectiveness of LED street lighting. Despite the initial investment being slightly higher than traditional lighting options, LED lights' longer lifespan and reduced maintenance costs ultimately translated into substantial savings over the long term. This made them an attractive choice for cities looking to optimize their budgets while improving infrastructure.

4. Technological Advancements

Another intriguing aspect revealed by the report was the rapid pace of technological advancements within the LED street light industry. Innovations like smart lighting controls, remote monitoring, and adaptive lighting systems were transforming cities into smart, connected spaces. This not only improved energy efficiency but also enhanced public safety and security.

5. Environmental Impact

China's commitment to environmental protection was reflected in the report's findings. LED street lights emit less light pollution and contain fewer hazardous materials compared to traditional lighting technologies, further contributing to a cleaner and more sustainable environment.

6. Market Growth and Challenges

While the 2017 report highlighted substantial growth in the Chinese LED street light industry, it also shed light on challenges faced by manufacturers and stakeholders. These included issues related to standardization, quality control, and market saturation. The rapid growth of the industry led to concerns about product quality and the need for clear industry standards.

7. Future Prospects

The report concluded with a positive outlook for the future of China's LED street light industry. It projected continued growth driven by urbanization, government initiatives to reduce energy consumption, and advancements in technology. Additionally, it emphasized the importance of international collaboration to develop global standards for LED street lighting.

Conclusion

The 2017 China LED Street Light Industry Research Report unveiled a compelling narrative of China's transition towards energy-efficient and sustainable urban lighting. LED technology's ascendancy, driven by its energy efficiency, cost-effectiveness, and positive environmental impact, has illuminated the path toward greener and smarter cities.

As we look beyond 2017, it's clear that LED street lighting will continue to play a pivotal role in shaping the future of urban infrastructure in China and across the globe. With ongoing technological advancements and a shared commitment to sustainability, the future is indeed bright for the LED street light industry.

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