Many enterprises are more favor of application of LED street lamp, but there are some problems in the structure design, lighting and creative, design, which caused confusion for the owners of the use and selection LED street lamp. This article discusses the five existing LED lamp structure and design problems and proposes corresponding solutions, the following main problems existing in the current market, a single LED lamp:
First, bring the maintenance difficulty overall design. The overall design refers to the light source lamp cavity that cannot be designed as a whole, so it cannot be maintained, or the light source cavity and a power supply chamber is designed as a whole, so it also can not be maintained. The practice in recent years shows that LED street lamp can not do without maintenance. The integral lamp is impossible to maintain, the general road after failure in the elevated, the car couldn’t finish the maintenance task, the whole lamp should change back to the manufacturer for repair. This will force both manufacturers and service providers changing the role from a manufacturer, but it needs to pay a heavy price.
Second, sharp edges and corners of the naked cooling block, so it does not meet safety standards for lamps. Sharp edges and corners is a lamp body of some metal parts that appear many sharp corners. The sharp corners of the existence of at least three cons. First, it is difficult to protect processing and handling process, because it is easy to curl. Second, surface treatment, either electro-plating or spray, the work piece itself must be charged, and prone to “in the corner Judian” phenomenon, or cause the damage, or cause the coating (plating) too thick. Third, it easily hurt workers, some manufactures’ corners of lamps are too sharp, so it is often cut assembly workers’ hand, more dangerous is that if workers were scratches on the elevated car, and it may be due to instinct loosen hands, the consequences will be unbearable to contemplate.
Third, material surface treatment (including power supply), erosion can stand long time in harsh environments. The so-called “naked” street lamp is generally radiator directly exposed outside the LED street lamp. Some manufacturers think it is more conducive to heat, but the premise is that lamps must be installed in a relatively clean, free from outside influence of environment conditions, and the lamps in practical application are directly installed in the outdoor, otherwise it may suffer from acid rain, sandstorm, Blizzard, exposure and other harsh environment.
Secondly, the aluminum alloy is smaller, the capability of heat dissipation is superior, so the radiator of LED street lamp are mostly made of aluminum alloy, but the chemical properties of aluminum alloy is very active, easy and acid-base reaction, exposed in the air is also very easy to oxidation. Although after anodic oxidation treatment on the corrosion resistance, which has greatly improved, yet there still can not guarantee the lighting installation oxide film from being destroyed, when the oxide film is damaged, aluminum alloy will be actively show chemical properties. Acid rain is prone to pollution in some relatively large areas, acid water will accumulate in the lights of the certain gap and groove, after raining, the sky looks blue. After the acid water gap or the groove on the volatile corrosion of lamp body, lamp body will affect the appearance, cooling, and more effect on Mechanical properties. In addition, the “naked” type lamps, due to structural characteristics of the radiator, it is easy to accumulate dust and snow itself. The dust cover on the radiator will make cooling performance down, and it greatly reduced aluminum alloy. The snow on the surface look more conducive to heat, but in fact the lamps in the cold weather of the heat is enough, a lot of snow will cause the enormous pressure.
Fourth, rectangular shape design does not meet the requirements of wind resistance. Rectangular shape what is said here refers to the nearly square shape, surface area in each. This plane is much better, when the wind from a plane perpendicular to its plane, that will not blow, the wind differentiation, thereby causing pressure to the lamp and lamp fixing structure. The pressure is not obvious in general, but when the lamp suffers aging and corrosion of long time later, if hitting in the coastal areas of the typhoon, there may be poles tilt or bending or lamp falling risk.
Fifth, the heat island effects caused the high failure rate of LED street lamp. Heat island effect is mainly refers to the city air temperature, which is said that the suburb is high, like a warm island located in rural cooler “marine”, this phenomenon is known as the urban heat island effect. In fact, this phenomenon exists in the LED street lamp radiator, especially when only by natural convection. Cooling process of LED lamp is mostly depends on the radiator and air convection heat transfer, in the exclusion of external wind influence mainly by natural convection. Natural convection is cold air by contact and radiators are raising natural radiator heating, cold air continue to add in, through such constant cycle to heat away. If the radiator is too large, the middle part of the hot air rising after the cold air can not have enough supplement (or near a light source in the heating, the air is relatively hot), this will lead to a decline in the middle part of the heat radiating efficiency, temperature rise, thus form the urban heat Island effect. The urban heat islands of LED aging are higher fault rate than the surrounding LED.