The application of LED street lamps has attracted the attention and favor of many companies, but there are some problems in structural design, lighting creativity, design and so on, which has caused a lot of confusion for the owner's use and selection. This paper discusses five problems in the structure and design of LED lamps and proposes corresponding solutions. The main problems of the single "naked" street lamps on the market are as follows:
First, the surface treatment of materials (including power supplies) is difficult to withstand the erosion of long-term harsh environments. The so-called "naked" street lights are generally street lights that are directly exposed to the radiator. Some manufacturers believe that this is more conducive to heat dissipation, but the premise is that the luminaire must be installed in an environment that is relatively clean and unaffected by external harsh conditions. In practical applications, the luminaires are directly installed outdoors, and may be exposed to acid rain, sandstorms, Blizzard, exposure and other harsh environments. Secondly, due to the small specific gravity of aluminum alloy and excellent heat dissipation performance, the radiator of LED street lamp is generally made of aluminum alloy, but the chemical properties of aluminum alloy are very active, it is easy to react with acid and alkali, and it is very easy to be oxidized when exposed to air. . Although the corrosion resistance of the aluminum alloy is greatly improved after the anodizing treatment, it is 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 expressed. In some places with high pollution, acid rain is likely to occur. Acid water will accumulate in some gaps and grooves on the lamp body. After rain and fine, the volatilization of acid water in the gap or groove will corrode the lamp body and be corroded. The lamp body not only affects the appearance, heat dissipation, but also affects the mechanical properties. In addition, the "naked" street lamp is very easy to accumulate 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, while the surface of the snow seems to be more conducive to heat dissipation, but in fact, in the cold weather, the heat dissipation of the lamp is sufficient, and a large amount of snow will instead The pole caused a lot of pressure.
Second, the rectangular design does not meet the wind resistance requirements. The rectangular shape referred to herein means that the luminaire has a nearly rectangular shape, and each surface has a large-area plane. Such a plane is better stressed. When the wind is blown vertically from a certain plane, its plane cannot differentiate the wind, which puts pressure on the lamp post and the fixed structure of the lamp. This kind of pressure is not obvious under normal circumstances. However, when the lamp post has been aging and corroded for a long time, if it hits a typhoon in the coastal area, there may be a risk that the pole will tilt or bend or the lamp may fall.
Third, the heat island effect causes high failure rate of LED street lamps. The heat island effect mainly means that the temperature of the city is higher than that of the surrounding suburbs. It seems that 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 on the larger LED street light radiators, especially when it is purely natural convection. The most important part of the heat dissipation process of LED lamps is the convection heat transfer between the radiator and the air. The natural convection is mainly caused by the exclusion of external wind. Natural convection is caused by the cold air that is in contact with the radiator and is naturally heated by the radiator. The cold air next to it continues to be replenished, and the heat is taken away by such continuous circulation. If the radiator is too large, the hot air in the middle part will rise and there will not be enough cold air to replenish it (there is also a light source heating and the air is relatively hot), which will cause the heat dissipation efficiency of the middle part to drop and the temperature to rise. A heat island effect is formed. The LEDs in the center of the heat island age faster than the surrounding LEDs, and the failure rate is higher.
Fourth, the overall design brings difficulties in later maintenance. The monolithic design refers to designing the entire light source cavity of the luminaire as an unmaintainable whole, or the light source cavity and the power supply cavity together are designed as an unmaintainable whole. Practices in recent years have shown that LED lamps are unlikely to be maintenance-free. This kind of integral luminaire is just unmaintainable. Generally, after the road is faulty, the maintenance task cannot be completed on the overhead car. The whole lamp should be replaced and brought back to the factory for repair. This approach forces manufacturers to change from a manufacturer to a manufacturer and service provider at a huge cost.
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