Author: City of Guangdong Real Faith Group Xulian
Many "enterprise" companies are optimistic about LED semiconductor lighting is an emerging sunrise industry. LED street light products are still in the development stage of immature process, and they are eager for quick success and at the same time encounter confusion and confusion under the promotion, and do not know where the road is. In response to this problem, I will elaborate on the following three aspects: for the "industry" enterprise reference!
1. LED road lighting manufacturing is an industry integrated technology
2. LED street light fixture design is an art
3. LED street light promotion is a learning!
First of all, I still talk about the technology of LED street lights, the importance of quality to product promotion.
★.LED road lighting manufacturing is an industry integrated technology
The design and manufacture of road lighting fixtures is a systematic project, which includes: scientific and effective use of light sources, heat treatment, reliability of power supply, design design in line with road lighting requirements, etc... LED road lighting is a new generation of lighting products with high technical content. Based on the importance of road lighting, Dr. Li Liling, deputy head of the Energy Technology Group of the Taiwan Industrial Technology Research Institute, pointed out that road lighting design considerations include sufficient illumination, uniform brightness, pleasant light color, avoiding glare, inducing driving, energy saving and maintenance. Convenience and so on. Therefore, street lights must be good, reliable and safe. Secondly, the lamps have high efficiency, good lighting utilization, proper light distribution, long life, waterproof and dustproof, etc., to provide safety, reliability, energy saving, visual comfort, low light damage and low maintenance rate.
Road lighting is subject to strict requirements. The global road lighting setting specifications and street lamp performance standards are quite complete and clear; the standards generally include illuminance and uniformity (minimum illuminance/average illuminance), and CIE 115 of the International Commission on Illumination (CIE) proposes a reference specification to Divided into four categories, the road illumination standard is divided into 15, 20, 30 and 50 Lux, and the uniformity (minimum illumination / average illumination) requires 0.4, but based on environmental and cultural factors, there are still considerable gaps in national regulations.
LED street light meridian surface light distribution curve
LED lamp light intensity curve
High pressure sodium lamp meridian light distribution curve
High-pressure sodium road light intensity curve
Relevant standards for road lighting design; (1. Road lighting: standard lamp column arrangement, pole height and pole spacing design; (2. Lamps used in road lighting: standardizing the type of street lamps and light distribution requirements; (3 Light poles for road lighting: standard requirements for light poles; (4. Light source and ballast testing standards; (5. Photoelectric automatic extinguisher test for street lamps, etc. To do LED street lighting, first need to understand the tradition Lighting technology: Traditional lighting streetlights are included; light source, light source cavity, power supply, lamp housing with road lighting requirements.
The core technology of traditional street lighting fixtures in the design of the light source reflector, (pattern)
LED street light utilization coefficient curve
High-pressure sodium lamp utilizes the characteristic curve sodium lamp spherical light source characteristics, the effective utilization of the brightness of the two wings, the quality of the reflector determines the overall efficiency of the lamp, and also depends on the oxidation life of the reflector (the temperature of the light source cavity is close to 200 °C) ). Due to the bottleneck of the anodizing process, the general reflector is quickly discolored by the high temperature baking of the light source cavity, and the reflective effect is accelerated. After a period of operation, most of the light is in the middle section, which tends to cause a zebra effect in the dark area.
The housing of the luminaire is used for heat dissipation and protection, and its streamlined design requires road lighting and wind resistance. Due to the limitations of its gas discharge lamps, the shape is mostly "snake-like" functional lighting fixtures.
The disadvantage of traditional street lighting fixtures; the high voltage and high current power supply mode, the effective utilization of light output is low.
The advantages of traditional street lighting fixtures; years of experience in application design and manufacturing, stability of light source electrical appliances, versatility of standard power series, easy maintenance.
LED lamp source efficiency and point illumination uniqueness, in the light source cooling guarantee, optical rational light distribution effective use, to meet the road lighting requirements of color temperature selection, power supply stability and reliability, design and other aspects and conventional lighting are essentially different, It is worth the designer to analyze the research.
I recently visited some of the use units in the Mainland and directly exchanged face-to-face with government officials, owners, streetlight engineering design and construction personnel, and analyzed the bottlenecks of LED streetlights from some cases.
Interpretation of a real-life photo of a city; from the negative photos:
The use of cold white light, unreasonable light distribution effect, the stubborn road defects of the fast road, the consequences of the strong reaction of the public, according to this way, the negative effects will affect the development of LED street lights. The mayor's investigation of the white light and warm light in the field: It is not allowed to use the white light on the road. The low-price bidding result was abolished on the same day, and the city decided to allow only the use of warm white light.
For the on-road situation of a number of luminaire experimental sections, the pertinent evaluation of the streetlight unit on the LED streetlight is: 1. The cold white light does not have the fog-passing performance and is not suitable for road lighting. 2. The replacement of the lamp pole load overload affects the safety, 3. The elevation angle Unrecognizable after the replacement of the light is not reasonable, 4. In view of the lack of versatility and overall lamp design of the LED street light fixture, the existing technology of the street lamp is difficult to maintain, 5. It is recommended to modular design, easy to maintain.
In a city, the LED street lights of a long section of a certain experiment have strong negative reaction in light distribution, brightness, color temperature, price, etc., talk about LED street lights, "color change", after many in-depth work and bring different products to practice comparison Only changed the attitude and promised another experimental road.
The cold white light and stone tombstone case of a certain section; the cold white light of an experimental section, the original night walk and leisure road, became cold and gloomy, plus the original stone gravestone gloomy fear, the people complained. After switching to warm lighting, it is fun. The importance of visible color temperature in street lighting.
Analysis of traffic accidents caused by LED street lighting factors:
      Cases of traffic accidents on hillsides: On a hillside with a lot of detours, at 3 o'clock in the afternoon on a clear day, there were repeated traffic accidents in which the motor vehicles rushed down the slope. Many times the investigation failed, and the final optical expert verified the answer. The sun's brightness light just forms a straight line here, invisibly causing the driver's wrong driving direction to cause a traffic accident. Visible brightness plays an important role in driving driving in road lighting.
      The contrast data of white light and warm light reflectance of different color temperature is almost doubled; from the test data graph, it can be seen why the brightness of some lights is different from the observation of different angles of view!
The need for improvement in many key technologies and concepts of LED street lights today.
      Many manufacturers are also developing towards modularization, but we must understand the meaning of "true modularity", 1. avoid the bottleneck of high-power power supply, 2. the hidden rules of easy maintenance, and 3. clearly recognize The centralized miniaturization of the light source module requires technical requirements for glare and heat dissipation.
      True modularity
      ★.LED street light fixture design is an art
      Among the many advantages of LED, its design should be its long term, and it is also incomparable to the traditional gas discharge lamp lighting fixtures. Just nowadays, some manufacturers follow the traditional lighting "snake head" model to follow up. (Schema)
      "Caterpillar" story.
      An insect "caterpillar" that loves pine needles. Entomologists have found that the insect has a habit of walking in love, so they put it in a bottle bottom and put "caterpillar" on the side. The pine needles observed their behavior, and they saw that the "caterpillars" circled the bottom of the bottle under the leadership of the front one. They dismissed the pine needles near the bottle, but blindly followed one Go, until you are exhausted and starved to death. The reason is because the front is like this, so the following is followed by the front, why? do not know! They follow established methods and steps, and there is no other reason, because "everyone does that" and "everyone thinks it should be done."
      The results of the above story reveal a very profound implication. Whether the practice of some LED application products manufacturers today is similar to the "caterpillar" phenomenon!
      The appearance of LED street lights requires attention:
      ◆The weight limit, the replacement lamp uses both the bearing capacity of the original pole and the wind resistance requirement m•s.
      ◆Combined light source and heat sink material to make small power supply, ensuring reliable, stable and long life, and with lightning protection/surge function.
      ◆ It has the protection level requirement and the importance of translucent cover.
      ◆ Easy installation and maintenance, angle adjustability, and truly modular development direction.
      ◆The combination of plastic arts, “viewing during the day, watching the lights at nightâ€, beautify the environment.
      The trend of decorative lighting, street lighting style is aesthetically pleasing, with local cultural characteristics, and with a moderate arrangement, reducing the number of poles and maintaining uniform light on the road surface, reducing installation costs and adding beauty.
      ★. LED street light promotion is a learning!
      The global demand for energy conservation is higher than the wave. The government is the key to promoting the development of the LED industry. As a production company, it is necessary to pragmatically put the quality of its products first, and professionally:
      Actual use calculation of engineering cables (professional description)
      Annual maintenance cost (objective and professional)
      Pragmatic energy-saving data (the efficiency of traditional lighting and the actual efficiency of LED street lights)
      More comprehensive sample information, (LED street light replacement traditional street lamp energy saving program)
      Collecting LED lighting fixtures into traditional energy-saving effect manuals for traditional lighting, conducting appropriate publicity to the owners, patiently persuading the traditional thinking of the relevant personnel.
      Everyone needs to understand the meaning of the interpretation of "finding the right person, speaking right":
      It is recommended that combining local culture to produce products will be more effective. â—Pengcheng ------Shenzhen â—Bamboo Culture----Hunan â—Pen Culture----Huzhou â—Kite Culture--Weifang makes our city beautiful and the LED industry develops.
      Channel construction is a difficult point in the promotion of LED streetlight products. The real streetlight channel network is in the hands of traditional lighting manufacturers. They know what kind of products the owners need, what kind of services, years of deep-seated, flexible market hidden rules applications, and Joint promotion will accelerate the development of the industry.
      Pre-sale, sale, after-sales and after-sales service are the key. Our product research and development should fully consider the feasibility and ease of maintenance. According to the practice of some enterprise products, I am really worried that it is on a road, and I have set a lock on my neck, and the heavy after-sales service is maintained to the enterprise. How to bear the long-term burden? Can you pass on the maintenance service to the owner in product design? To put it bluntly, the owner is also willing to do so.
      From the analysis of the test results of LED streetlights in Shenzhen, we should realize that the quality of products is crucial, responsible for the company, responsible for the industry, and the consequences of malicious competition with low prices will lead to crude production, quality cannot be guaranteed, corporate losses, industrial development blocked. . I believe that the industry will be reshuffled for a period of time, and there will be big waves of sand. The products that have been eliminated must be poor quality products. They are people who have entered the wrong zone. We hope that everyone will take a detour and move on the right path.
      LED lighting has the potential of energy saving and environmental protection, and road lighting belongs to government public utilities. Governments at all levels are paying more and more attention to energy conservation and environmental protection, and the future business opportunities of LED street lamps are unlimited. Our generation is very fortunate. We are working hard for the revolution of the fourth generation of light sources. We are for the benefit of future generations. We are together to write history and witness the history together. Although our road is still very difficult, I believe that the road to success will be At our feet.....implemented.
Source: Chongqing LED Industry Alliance
Modern luxury hotels, commercial centers and homes are more and more high demand for lighting systems. The DALI light led driver series promoted by MOSO are complying with the IEC62386/IEC60929 standard. And it can be connected to any device that conforms to DALI protocol in one circuit control.
The Dali LED Driver is designed specially for the project requiring DALI control; it is approved by CE, TUV, ENEC, and DALI mark on the label.
Dali LED Driver,Dali Dimmable LED Driver,Dali Street Light LED Driver,Dali Flood Light LED Driver
Moso Electronics , http://www.mosoleddriver.com