Difficulties and countermeasures of LED street lamp structure and appearance design

Oct 2021

Difficulties and countermeasures of LED street lamp structure and appearance design

The application of China LED street lights has attracted the attention and favor of many companies, but there are some problems in structural design, lighting creativity, modeling design and other aspects, which have caused a lot of confusion for the owner's use and selection. This article discusses five problems in the structure and appearance design of highway Led street lights and proposes corresponding solutions. The main problems of a single "naked" street lamp on the market are as follows:

   First, the surface treatment of the material (including power supply) is difficult to withstand the erosion of the harsh environment for a long time. The so-called "naked" street lamp is generally a street lamp with a radiator directly exposed outside. Some manufacturers believe that this is more conducive to heat dissipation, but the premise is that the lamps must be installed in a relatively clean environment that is not affected by harsh external conditions. In actual applications, the lamps are directly installed outdoors and may encounter acid rain, sandstorms, Various harsh environments such as blizzard and sun exposure. Secondly, due to the small specific gravity of aluminum alloy and superior heat dissipation performance, the radiator of LED street lights generally uses aluminum alloy, but the chemical properties of aluminum alloy are very active, and it is very easy to react with acid and alkali, and it is also very easy to oxidize when exposed to the air. . Although the corrosion resistance has been greatly improved after anodizing treatment, it is still impossible to ensure that the oxide film is not damaged when the lamp is installed. When the oxide film is damaged, the active chemical properties of the aluminum alloy can be displayed. Acid rain is prone to occur in some heavily polluted places. Acidic water will accumulate in some gaps and grooves on the lamp body. The volatilization of the acid water in the gaps or grooves will corrode the lamp body and be corroded after the rain has passed. The lamp body not only affects the appearance and heat dissipation, but also affects the mechanical performance. In addition, the "naked" street lamp is very easy to accumulate sand, dust and snow due to the structural characteristics of the radiator itself. The dust covered on the radiator will greatly reduce the heat dissipation performance of the aluminum alloy, and the snow surface looks more conducive to heat dissipation, but in fact, the heat dissipation of the lamp is sufficient in cold weather, and a large amount of snow will adversely affect the heat dissipation. The light pole caused tremendous pressure.

   Second, the rectangular design does not meet the wind resistance requirements. The rectangular shape mentioned here means that the lamp has a nearly tetragonal shape, and each surface is a large-area flat surface. Such a plane is better to bear the force. When the wind blows from a plane perpendicularly, the plane cannot divide the wind, which will cause pressure on the light pole and the fixed structure of the lamp. This kind of pressure is not obvious under normal circumstances, but after a long period of aging and corrosion of the lamp pole, if you encounter a typhoon in the coastal area, there may be the danger of the lamp pole tilting or bending or the lamp falling.

   Third, the heat island effect causes a high failure rate of LED street lights. The heat island effect mainly refers to the fact that the temperature in the city is higher than that in the surrounding suburbs, as if a warm island is distributed in the cooler "ocean" of the countryside. This phenomenon is called the heat island effect. In fact, this phenomenon also exists in larger LED street lamp radiators, especially when relying solely on natural convection. The most important thing in the heat dissipation process of LED lamps is the convection heat exchange between the radiator and the air, and natural convection is the main factor to exclude the influence of external wind. Natural convection means that the cold air in contact with the radiator rises naturally after being heated by the radiator, and the cold air next to it continues to be replenished, and the heat is taken away through continuous circulation in this way. If the radiator is too large, there will not be enough cold air to supplement the hot air in the middle part after it rises (there is also a light source heating up next to it, and the air is relatively hot), which will cause the heat dissipation efficiency of the middle part to decrease and the temperature to rise. Form the heat island effect. The LED in the center of the heat island ages faster than the surrounding LEDs and has a higher failure rate.

   Fourth, the overall design brings difficulties in later maintenance. Integral design refers to the design of the entire light source cavity of the lamp into an unmaintainable whole, or the design of the light source cavity and the power supply cavity together into an unmaintainable whole. Practice in recent years shows that it is impossible for LED lamps to be maintenance-free. However, this kind of integral lamp is precisely impossible to maintain. Generally, when a failure occurs on the road, the maintenance task cannot be completed on the elevated vehicle. The entire lamp must be replaced and brought back to the manufacturer for repair. This method will force the manufacturer to change from a manufacturer to a role of both a manufacturer and a service provider, which requires a huge price. Fifth, the naked heat sink with sharp edges and corners does not meet the requirements of the lamp safety standards. Sharp edges and corners refer to the appearance of multiple sharp corners on some metal parts of the lamp body. The existence of this sharp angle has at least three disadvantages. First, it is difficult to protect during processing and handling, and it is easy to curl. Second, the surface treatment is difficult. Whether it is electroplating or spraying, the workpiece itself must be charged, and the phenomenon of "electric gathering" is likely to occur at the sharp corners, or it may cause burnout in the area, or cause the coating (plating layer) to be too thick. Third, it is easy to injure the operators. Some manufacturers’ lamps are often scratched due to the sharp edges and corners of the transfer workers. What’s more dangerous is that if the workers are scratched while installing the lights on the overhead vehicles, they may get their hands off their hands due to instinctive reaction. Let go, the consequences will be disastrous.

   In response to the above five problems, this article discusses some solutions. Regarding the first and second questions, the author thinks that a streamlined upper cover can be added to the lamp. The streamlined upper cover should not have a large surface area, and it is best to have a high middle and low periphery. Of course, the cover must have a well-designed heat dissipation hole and diversion surface. This has four advantages: First, the cover can reduce the damage to the protective layer of the radiator by the ultraviolet rays; second, the streamlined shape is not conducive to the accumulation of rainwater on it, and most of the water can be directly directed to the ground, reducing acid and alkali Corrosion of materials to the lamps; third, the streamlined surface can greatly reduce the dust and snow accumulated on it, which is good for heat dissipation and reduces the pressure of the lamp pole and the lamp; fourth, the streamlined surface can divide the wind into multiple directions and reduce the force Light pole and lamp pressure.

   Regarding the third and fourth questions, the author suggests that the lamps should be "divided into parts", abandon the monolithic design, and change to a modular design. For the fifth question, it is recommended that the lighting design engineer consider from the perspective of the operator, and pay attention to the details of the design as much as possible.

   In addition, in terms of design, traditional lighting has accumulated many years of experience in modeling design. Semiconductor lighting design engineers must absorb the essence of traditional lighting. Compared with traditional lighting, LED light source has the characteristics of small size and flexible array mode, which can realize diverse and exquisite product designs. In addition, semiconductor lighting design engineers should combine regional culture to develop industrialized and artistic design products. Places have their own unique regional culture and customs. Only lamps designed according to local characteristics can be more popular with people and allow visitors to learn more about the local characteristics. For example, the author conceived the creative design of "Zhangkongjian" and "Guzheng Love" a few years ago, and recently conceived the creative design of "UFO", "Boxer", "Gourd Baby", etc., which have been favored by many customers and colleagues.

At the same time, as a led street light manufacturers designer, in addition to being proficient in lighting common sense, he should also continuously improve his own comprehensive quality, go deep into life, know how to discover and feel the beauty of life, and integrate emotions into the design of his works, so as to achieve vitality, Thoughtful lighting design.

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