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Research Report on High Efficiency and Energy Saving LED Street Lamp


I. Research Background

With the transformation from industrialization to information age, lighting industry has been promoted orderly from electrical products to electronic products. Energy-saving demand is the first trigger for product iteration. When people realize that the new solid-state light source has brought many benefits to society, the industry has developed rapidly.

However, in the initial application of LED lighting products, because of the low light efficiency of the light source, people increase the power to maintain brightness to meet the application requirements, but it is found that the initial luminous flux of lighting will decrease rapidly. Technicians have found that in order to solve this problem, besides effectively improving the light efficiency of the light source, we should also improve the heat dissipation system to make the product structure more in line with the physical characteristics of the semiconductor light source. When the light efficiency of the light source has been improved to 170lm/w or higher lumen, it is generally believed that the progress of product technology, LED lighting can be comparable to and surpass the traditional light source. As the application conditions become more and more mature, the sound of dwarf LED lighting products such as heat dissipation and light decay is rarely heard in the industry. Is LED lighting really perfect, mature and stable enough to replace traditional light sources? NadarajahNarendran, a research director at LLRC, said that a compact fluorescent lamp would lose up to 70 of its output if it matched an inappropriate optical system. Likewise, without the right optical system, the popular performance of LED will no longer exist. This advice once again warns lighting practitioners that the improvement of light efficiency of light source and heat dissipation system has improved the inherent defects and application problems of LED lighting to a certain extent, but it has not fundamentally solved the problems of high quality, long life, stability and reliability of high-power lighting products. Only further in-depth study of the "instant heat dissipation" of LED as functional lighting is needed. And through the allocation of light to achieve maximum light efficiency utilization of light source "deep-seated problems, can fundamentally achieve a comprehensive replacement of traditional lighting!" To this end, we jointly organized the research group jointly with the relevant units of the municipal design and Research Institute, to conduct in-depth research on LED functional lighting products and try to find the best solution for the application level of LED light source.

II. Research Ideas

1. The light efficiency (100-120 Lm/W) of LED with color temperature of about 2800K is not significantly better than that of high-pressure sodium lamp (100-120 Lm/W). Why can LED be used in road lighting to save energy?

2. The guiding goal of road lighting is road. Can secondary lighting technology be designed according to the characteristics of road lighting to realize the possibility of energy saving?

Firstly, it analyses the form and characteristics of road lighting.

(1) The lamp pole is installed at the roadside, resulting in an asymmetric illumination angle.

(2) Street width: lamp pole height: lamp spacing = 1:1:3 (cut-off lamps), forming a rectangular irradiation range;

(3) The road is divided into different grades according to the different traffic flow and speed restrictions, and the roads of different grades have different requirements of brightness and uniformity.

It is neither scientific nor far-fetched to evaluate the characteristics of LED street lamp by traditional lighting performance evaluation methods. This study explores the use of coefficient of utilization as an evaluation method of LED street lamps. The light efficiency of LED light source (Lm/W) can not really reflect the energy efficiency of LED street lamp. The luminous flux of a single LED can not be used as a light source alone in road lighting; the luminous output of the integrated LED module is not equal to the total luminous flux of the LED because of the different thermal conductive substrates and thermal conductive transfer systems used.

Therefore, LED lighting should focus on the luminous flux of lamps rather than the luminous flux of light sources, and should focus on the luminous efficiency of lamps rather than the luminous efficiency of light sources.

However, the luminous efficiency of lamps (Lm/W) can not really evaluate the advantages and disadvantages of LED street lamps. Lighting efficiency of lamps is an important index to evaluate energy saving of general lighting. As a functional lighting, LED street lamp has more "secondary light distribution" parameters than general lighting, and the more uniform the secondary light distribution, the lower the light efficiency of lamps. Therefore, it is difficult to evaluate the advantages and disadvantages of LED street lamp only by the light efficiency of lamps.

Therefore, as a key evaluation index, lighting utilization ratio (road luminous flux/luminaire flux) is locked in the focus of this study, that is, the ratio of luminaire flux allocation to the illuminated object is the key to truly effective response to the merits and demerits of functional lighting!

On the premise of meeting the lighting standards, the utilization rate of standard lighting and power become an important index to measure the performance of lamps and lanterns. The power level determines the technical level of heat dissipation, optics and power supply driving for street lamp manufacturers.

In view of this, the purpose of this LED street lighting system research is to verify:

(a) Light distribution effect of LED street lamps;

(b) Energy-saving effect of LED street lamps;

(c) The secondary energy-saving of LED street lamp intelligent dimming is to be achieved through the test section:

(a) The secondary light distribution design is mainly in the vehicle lane and SR, and the illumination uniformity must be above 0.35.

(b) The average illumination of the LED street lamp with color temperature of 2800K on the motor lane is not lower than that of the original high-pressure sodium lamp.

(c) Intelligent dimming, through 0-10V dimming driving power supply, let the LED street lamp and the original high-pressure sodium lamp under the same average illumination, test the same level of energy saving illumination.

III. Technical Route

As a scientific and technological company focusing on lighting research and development, we clearly recognize the importance of street lamp equipment and energy saving in road construction, and also see the relevant technical bottlenecks that must be broken through in the application of LED street lamp. For this reason, combining with road lighting design work, the research topic of LED street lighting system is put forward. In conjunction with the relevant design units, we have developed a practical LED street lighting system which represents the advanced concept of the future.

(1) Reflective optics

The height and angle of the light guide plate are designed based on the principle of reflective optics, and the light emitted by the LED is guided to the expected place. The advantage of reflective optics is that the distribution angle of the vertical light distribution curve can be designed accurately.

By means of the light guide plates on both sides, the beam distribution angle can cover a larger road area, the luminaire efficiency is high, and the lighting utilization ratio is high, so the total optical utilization ratio is also high, which is suitable for the lamp pole height-to-distance ratio of less than 3.5 (including). The disadvantage is that the secondary light distribution curve of the driving direction is about the same as that of the original LED. In order to change the secondary light distribution curve of the driving direction when the height-to-distance ratio of the lamp pole exceeds 3.5, it is necessary to make the waterproof lamp shell into a groove mirror to increase the angle of the light distribution curve of the driving direction or to use the light source with a longitudinal light distribution lens to increase the longitudinal light output. Angle.

(2) Refractive optics

Refractive optics uses the characteristics of light waves in different media (lenses) in different directions to control the LED light to different places. The advantage of refractive optics is that the distribution of light distribution curve in driving direction can easily be designed as the best driving direction, and the maximum value of light distribution curve is between 60 and 65 degrees. The disadvantage is that the distribution angle of the road width distribution curve is not easy to design. If we want to design a narrow distribution curve (covering a larger road area), it will lead to more total reflection light and poor lighting efficiency. Although the lighting utilization rate is higher (because the distribution beam of narrow distribution curve falls mostly on the road), the total optical utilization rate (luminaire efficiency * lighting utilization rate) is still low. In order to improve the efficiency of lamps, it is necessary to reduce the total reflected light in the design, so the distribution angle of the road width direction distribution curve is wide. However, because the distribution beam of the wide distribution curve of lamps falls out of the road, the lighting utilization rate is low, but the final total optical utilization rate (lamp efficiency * lighting utilization rate) is still the same. Low.

In 2014, the light efficiency of LED mass-produced chips can reach 160-180 Lm/W, crossing the photothermal equilibrium point (170Lm/w), and the proportion of heat loss is slightly lower than that of light output. This means that the heat dissipation problem of the LED is more and more manageable, but half of the energy is still in the form of heat, which needs to be removed to ensure the efficient operation of the LED.

It is found that there is a bottleneck effect in the copper foil of the circuit: the thickness of the copper foil increases, the operating temperature of the system decreases, but the thermal resistance also increases, and the pinch of the balance point is very important.

In addition, the test found that the early replacement products of LED still have the following drawbacks:

(a) Exposing the heat dissipating fins to the surface will result in the loss of heat dissipating function of the fins due to wind and rain.

(b) It is found that the dispersion of heat source (light source) will lead to the appearance of surface light source and the ghost phenomenon of LED.

LED street lamp and high-pressure sodium lamp are the same as the light, electrical components need high protection level, the difference is:

(a) The LED street lamp needs heat dissipation, and the shell is best able to convection naturally;

(b) The LED module needs IP65 or higher protection level to protect its silica gel from oxidative deterioration due to air contact.

In this study, modularization concept allows each module to work independently, so that each module undertakes its own unique protection measures, such as the protection level of LED module as high as IP66, lamp shell protection level is not limited.

IV. Research Contents

(1) Light distribution (light pattern correction)

There are many ways to design the distribution curve of road lighting. This study tries to study how to improve the utilization ratio of lighting and reduce the power of lamps in different lighting distribution technologies on the premise of conforming to the specification of the distribution curve of road lighting (average illuminance/brightness, uniformity, glare limitation, environmental ratio, etc.).

In the design of road lighting distribution curve, the requirement of driving direction and vertical direction (including environment ratio: the ratio of average horizontal illumination in 5 m wide area outside the lane to the average horizontal illumination in adjacent 5 m wide lane) should be considered.

1. It is advisable that the maximum light distribution curve of the driving direction be between 60 and 65 degrees. If the maximum value is 70 degrees, the beam above 75 degrees will be too large to cause the glare value (TI) to exceed the standard; if the maximum value is below 60 degrees, the Ul is not easy to reach the standard (especially the trunk road Ul < 0.7).

(1) When the lamp spacing is 3 times higher than the lamp height, the beam distribution angle should cover more than half of the lamp spacing (about 56 degrees).

(2) When the lamp spacing is 3.5 times the lamp height, the beam distribution angle should cover more than half of the lamp spacing (about 60 degrees).

(3) When the lamp spacing is 4 times the lamp height, the beam distribution angle should cover more than half of the lamp spacing (about 63 degrees).

(4) More than 75 degrees is glare, so the beam distribution over 75 degrees should be avoided.

2. Distribution angle of light distribution curve in the vertical direction of a vehicle. Taking the case of the same general road width and lamp height on one side as an example, the distribution angle of light beam should cover the road width (about 45 degrees), so the distribution angle of light distribution curve in the road width direction should be larger than 45 degrees.

(1) If the degree of illumination is greater than 45 degrees, the beam will fall out of the road, resulting in a decrease in the utilization rate of illumination.

(2) But if the environmental ratio SR is required, it needs to be greater than 45 degrees, so that the beam part will fall outside the road to meet the requirements of the environmental ratio SR, but the lighting utilization rate will decrease.

(2) Heat dissipation

There are three forms of heat transfer: conduction, convection and radiation. This study tries to find out the most suitable heat dissipation technology for LED in these three forms.

After comprehensive analysis of the above three ways, it is found that the most suitable way of heat dissipation for the characteristics of LED is conduction heat dissipation. In order to cope with the junction temperature, some manufacturers increase the specific area of heat sink fins, choose the base material with small thermal resistance effect and try their best to reduce the wall thickness of the base material to increase the heat sink efficiency, but the test results show that although the heat sink temperature has decreased, the light decay has not been significantly improved because of the increase of heat sink. The junction temperature needs to be derived, that is, the heat dissipation process must satisfy the junction temperature rate matching the conduction rate and emission rate in order to achieve the best heat dissipation effect. After heat pipe technology is used to guide heat dissipation, the junction temperature is maintained at an average of about 75 degrees, which is close to the ideal state. This research innovation uses heat pipe technology to solve the problem of heat dissipation perfectly.

5. Analysis of the Cost Advantage of LED Street Lamp over Traditional Street Lamp

LED is a solid light source based on the principle of semiconductor P-N junction luminescence. Its luminous efficiency has increased from 60 lm/W in 2007 to 204 lm/W at present, which has exceeded the light efficiency of traditional high-pressure sodium lamp source. High-power LED core has 1-5W/piece products.

The working life of LED under matched driving circuit is longer than that of traditional light source, and it is shock-resistant and reliable. The cost of operation and maintenance is low. The recycled materials are less polluted. Due to the continuous reduction of production cost, the cost of each LED street lamp is close to or lower than that of traditional high-pressure sodium lamp.

Compared with the traditional street lighting, the maintenance cost of the lamp is much lower. The contents of the study are as follows:

1. Study on high light efficiency and long life of LED street lamp:

In order to meet the brightness requirement of grade roads and the light distribution characteristics of standard street lamps, the luminous flux of single LED core requires the highly integrated of multiple LED monomers, and breaks through the technical bottlenecks such as light decay caused by high thermal resistance. Therefore, exploring the integrated technology of multiple LED monomers to meet the traditional form of single-lamp highlight spot light source and maintain the characteristics of high light efficiency, long life, safety and reliability is one of the important contents of the research.

2. Research on LED street lamp light distribution system:

LED has small luminous point and directional output light. Non-isotropic light source polymers with multiple luminous points pose a challenge to the traditional design of lamps and lanterns. Therefore, according to the characteristics of LED light source, the research of new light distribution means is the second part of the subject.

3. Modularization of LED Street Lamp:

In order to facilitate the installation and maintenance of LED lamps, it is necessary to study the modular components of LED lamps, and discuss the standardization of the structure, installation, wiring and control of LED street lamps. This is the third part of the research.

4. Research on Intelligent Control of LED Street Lamp:

With the development of IT technology and communication technology, it has become a reality to realize the single lamp monitoring and control of LED street lamp. The implementation of street lamp single lamp monitoring can not only obtain the running status information of a single street lamp in time, but also discover the intact rate of the street lamp in time. In addition, in view of the specific principle of LED lamp luminous operation, the smooth dimming of LED street lamp can be achieved to achieve the purpose of reasonable energy saving.

The automatic control and dimming technology of LED street lamp is the fourth part of this topic.


The conclusion of this test scheme is based on the relative value rather than the absolute value (compared with the original high-pressure sodium lamp).

CONCLUSION 1: The secondary optical technology in this study can effectively, uniformly and re-configure the light according to the design requirements. Empirical evidence is obtained from the following test data:

(1) The average illumination of non-motorized lanes is reduced while the light is effectively focused on the motorized lanes. The average illumination of the motor lane is 31.4?, higher than that of the original high-pressure sodium lamp. The average illumination of the non-motor lane is reduced by 18?, and 18.9?, respectively.

(2) Achieving the best uniformity of road surface (Emin/Eav=0.5, 0.35 of secondary trunk road is higher than 0.4 of CJJ45-2015 trunk road).

CONCLUSION 2: The optimal power saving rate can be achieved through the secondary optical technology in this study. Intelligent dimming can further realize the secondary energy saving of LED street lamps. Empirical evidence is obtained from the following test data:

On the premise that the uniformity reaches the standard CJJ45-2006 and the color temperature is 2800K

(1) The power saving rate was 43.39: the average illumination was 38.4 Lx (higher than the average illumination of the original high-pressure sodium lamp was 29.2).

(2) Power saving rate 61.7: average illumination 29.06Lx (original high-pressure sodium lamp average illumination 29.2Lx).

(3) Power saving rate 80.9: average illumination 16Lx (CJJ45-2006 requirements for sub-main roads: 10Lx-15Lx)


(1) The key technologies for the research of LED street lamps are:

1. The heat pipe technology is used to heat the LED module, and the thermal conductivity is moved out instantaneously. The LED luminescence is more efficient and the service life of the LED is prolonged.

2. Using the principle of "light reflection", the light energy of the LED module is projected to the demand interface through the "light guide module" to maximize the light efficiency utilization of the light source.

3. Module assembly of LED lamps.

(2) The research of intelligent power supply and control system for LED, and the key technologies to be solved.

1. The power output of driving LED module can be adjusted under control.

2. It can accept remote control of street lamp control management system through standard communication module.

(3) The key technologies for standardization research are:

1. How to Realize Modularization of LED Lamps

2. How to Realize Intelligent Control of LED Street Lamp

VIII. Technical Maturity

(1) Initial stage

On July 17, 2006, under the organization of Shanghai Science and Technology Promotion Center, Shanghai Yiyong Photoelectric Technology Co., Ltd. introduced the research idea of LED street lamp and saw the development potential of LED as a new light source in Conference Room 4 on the 7th floor of the Science and Technology Committee of Shanghai Construction Commission, although the light efficiency of LED at that time was only about 40Lm/W. 。

Shanghai Urban Construction and Design Research Institute is facing the situation of LED street lamp application. On November 8, 2006, Shanghai Yiyong Photoelectric Technology Co., Ltd. jointly formulated the "Research Plan of LED Road Lighting for Shanghai World Expo", and formally became the scientific research of Shanghai Urban Construction (Group) Company in March 2007. The project began to study the possibility of using LED as road lighting source.

In December 2008, the first LED street lamp we developed was installed on the site of Suzhou Company. Leaders of the Science and Technology Department of Shanghai Municipal Political and Engineering Bureau, the Science and Technology Department of Shanghai Urban Construction (Group) Company and all the researchers of the Urban Construction Institute and Yiyong Photoelectric Company were organized to watch the LED lights and field tests. After testing the brightness, illumination and uniformity of the road surface by the technicians of Changzhou Street Lamp Institute, the lighting effect of the LED street lamp fully meets the design requirements.

(2) Development and experimental stage of lamps and lanterns

On August 3, 2009, the second generation LED street lamp we studied was installed on Sanlihe East Road, which is the second trunk road, with the support of Beijing Street Lamp Center. It uses 180W LED lamp instead of 400W high pressure sodium lamp, which is 12m high and 42m apart. The lighting effect fully meets the requirements of the national standard CJJ45. It has been in good condition for 4 and a half years, with little light decay and core damage.

In early 2010, we developed 30 64WLED lamps and lanterns and tried them on the Changzhou viaduct. Due to the quality problem of the insulating glue on the base plate, many of them were damaged and had to be removed, which became a lesson in the research process.

(3) Promotion stage of lamp application

As a design, research, production and processing enterprise, we are deeply aware of the problems faced by the popularization and application of LED street lamps: the LED street lamp products are changing with each passing day. Designers do not know how to choose street lamps according to specifications, the market is chaotic, the quality is not good, the price is not clear, it is difficult to make the project budget, and the paradox is formed according to tile calculation. For street lamp users, the problems are: lack of standard interface, product interchangeability and maintenance difficulties; lack of integrated street lamp of non-modular production, need to replace the whole lamp in maintenance, increase labor and maintenance costs.

To this end, we have incorporated the concept of "standardization" into our research. In April 20, 2012, we jointly applied for the compilation of "municipal road semiconductor lighting technology application specification" with the science and Technology Commission of the construction and Transportation Commission, and the Yi Yi Photoelectric Technology Co., Ltd. For this reason, in 2013, as a participating unit, he participated in the compilation of the "LED road lighting application technology specification", and began to study how the components contained in lamps and lanterns could be easily disassembled after modularization, and how to standardize these modules. The standardization problems in the application of LED street lamps, such as the installation interface of lamps, the driving current of lamps, the installation position of power supply module, the communication standard of controlled system, are also studied. The research results are presented. Through the Shanghai Nanzhuang Road, Shanghai Disney tourism resort and other landmark case tests have reached the research expectation.

(4) Phase of systematic research

With the progress of research and popularization of LED street lamps, the demand of LED street lamps integrating into urban road lighting system is increasingly strong. That is to say, it is imperative to give full play to the advantages of LED street lamps and realize LED street lamp real-time monitoring and dimming and energy saving. For this reason, our research work has entered the stage of "systematic research", which includes not only the optical research of lamps, but also the research of intelligent power supply of lamps, the determination of controlled interface and communication protocol of lamps. In view of the importance of intelligent management of road lighting, in March 8, 2014, the urban construction design and Research Institute signed an agreement with intelligent technology, street lamp management center, and Lu Lu Hui Electronics Technology to cooperate in the research of intelligent application of LED street lights, so as to realize the management and monitoring of the working status of LED street lamps, and realize the two energy saving of LED street lamps by means of intelligent control. 。 In December 15, 2014, we successfully installed 21 sets of fourth generation LED streetlights that we studied in the secondary road 13m of the double lane motorway in Shanghai Road, and replaced the 250W high-pressure sodium lamp with 150W power. The field illumination test of the "energy efficiency center" of the authoritative organization under the Shanghai Municipal Commission of letters shows that the lighting effect of the 150WLED street lamp can completely replace the original 400W high pressure sodium lamp. The energy-saving effect is as follows:

1. When the 150 W LED street lamp output 100? Light power, the illumination to the road surface reaches 38.4 Lux, and the power saving rate reaches 43.39?.

2. When the 150 W LED street lamp outputs 68? Light power, the illumination to the road surface reaches 29.06 Lux. The electricity saving rate is 61.7?.

3. When the 150W LED street lamp outputs 31 light power, the illuminance of the road surface reaches 16Lux (the upper limit of the illumination standard of the urban sub Road). The electricity saving rate is 80.9?.

So far, our research work has lasted for eight years, and the final results have been unanimously recognized by experts and passed the evaluation and acceptance.

IX. Analysis of Popularization and Application Prospect

1. LED high-efficiency energy-saving street lamps adopt unique "secondary lighting" independent intellectual property rights application technology, to achieve similar products energy-saving 50? Year-on-year innovation breakthroughs! From international to domestic awards (2017 International Semiconductor Lighting Alliance awarded the Global 100 Best Cases, Shanghai Energy-saving Products Award, Shanghai Jiading District Science and Technology Progress Award), from theory to practice (Shanghai Housing and Construction Commission, Science and Technology Division, Ministry of Industry and Information Technology, Science and Technology Achievement Evaluation, Fengxian, Disney more than three years typical projects) Case study) From field measurement to laboratory testing (authoritative measurement of Shanghai Energy Efficiency Center and 6000 hours of light attenuation test of National Laboratory) have reached the highest application level in the industry.

2. LED high-efficiency energy-saving street lamp is different from similar products in the biggest characteristics: through the asymmetric secondary light distribution design, maximize the actual use of functional illumination of the illuminated surface, achieve the maximum effective luminous flux per unit power! It has positive significance for eliminating urban light pollution, reducing the impact on the growth rhythm of surrounding greening (crops), reducing the cost of urban lighting operation and maintenance, and promoting the fundamental transformation of urban road light environment.

3. Promote and promote energy management contract steadfastly, let functional lighting return to its original function: precise lighting, immediate illumination, illumination according to need, benefit-seeking and harm-avoiding.

4. LED high-efficiency energy-saving products will certainly lead the high-power outdoor lighting industry towards a more energy-saving, healthier, more environmentally friendly direction!

X. Existing Problems and Follow-up Directions

1. How bright should road lighting be?

After installing the LED street lamp, it meets the national road lighting standard CJJ45, or after installing the LED street lamp, it meets the current road lighting brightness (how to implement urban monitoring when exceeding the standard? )

2. Road lighting, road lighting or landscape lighting?

Should road lighting illuminate the road, clearly reflecting to the driver's eyes, or should road lighting illuminate the surrounding landscape so that the driver can see a wider range of scenes?

3. How to determine the environmental ratio of SR?

In CJJ45-2016/2013, SR requirements for main/sub-main roads are regulated, but branch/sub-district roads are not required.

The real need for SR is that pedestrians often walk behind the upright lights on branch/residential roads. The upright lights on main/sub-main roads are often located on isolated islands. Do you need SR?

4. How to determine the color rendering coefficient?

High color rendering coefficient can improve object resolution. How high color rendering coefficient does road lighting need?

The color rendering coefficient of LED is inversely proportional to the light efficiency. How to achieve the best balance between the color rendering coefficient and the light efficiency of LED?

5. How to determine the maintenance coefficient?

Maintenance factor corrects the light loss of light decay and environmental dust to light flux. How does the light maintenance requirement of LED reflect the setting of maintenance coefficient?

6. Testing method of luminous flux maintenance rate of LED module?

The luminous maintenance rate of LED module is directly related to its heat dissipation system. How to define an economical and effective test method for LED module optical flux maintenance rate?

Summary of Research Topics

The improvement of light efficiency of light source does not mean the improvement of lighting efficiency. Although the improvement of light efficiency of light source effectively reduces the power density, the light distribution through lens does not have the ability to shield light pollution completely (for street lamps, the "up-looking light and back light" generated accounted for about 26?) of the luminous flux of lamps, and the space for the reduction of power density is limited.

Only through accurate light matching, focusing the effective light intensity on the demand interface, reducing the ineffective light, reducing the junction temperature release pressure, can the characteristics of LED light source be maximized!

While guaranteeing the illumination intensity of the demanded interface, the output power of the product should be reduced, so as to achieve "illumination as needed and light distribution as needed"! This is the fundamental way out for the healthy development of semiconductor lighting industry in the future.

According to the above analysis, we can draw the following conclusions: the improvement of light efficiency of light source highlights the progress of the lighting industry, and its greater significance lies in the application level should be better improved light efficiency utilization of light source to promote the quality of LED lighting products and meet the application needs in a larger range.

1. The quality of LED street lamp depends on the efficiency comparison. That is to say, under the premise of satisfying functional lighting, the less power the product consumes, the better the quality!

2. The utilization rate of light efficiency is an important index to test the performance of semiconductor light source. Increasing the light efficiency of light source will help to improve the quality of lamps and lanterns by reducing the heat dissipation pressure, but improving the lighting efficiency is the key to high quality, long life, high efficiency and energy saving of LED street lamps.

3. Maximizing the effective luminous flux per unit demand interface not only solves the problem of product quality and life, but also achieves the innovation breakthrough of doubling the energy saving of the same kind of products over the same period of last year. It will certainly lead the development direction of outdoor functional lighting industry in the future.

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