Discussion on the outdoor lighting heat
The release date：2014-09-12 09:57 source：http://www.amlifecn.com Click on the：
Along with the LED lamp as the representative of the high-power outdoor LED more and more extensive scope of application, the heat problem has become increasingly prominent. In some areas, and even become the obstacles to the development of the industry. There are many advantages to environmental protection, especially in the street lamp, courtyard lamp, high pole lamp, landscape lamp and so on the many kinds of high-power LED lighting lamp light source is particularly obvious power saving effect. With China's rapid economic growth, it is necessary to improve the energy efficiency of lighting products in the increasingly tense energy situation, which is an important application of energy-saving LED street lamp.
Quick replace traditional lamp also exposed some problems in the LED street lamp: poor heat dissipation caused by leakage phenomenon emerge in an endless stream. The heat dissipation capability directly influences the reality of LED light-emitting efficiency and life expectancy, so heat and excellent design is the key must be considered. In fact, I feel to want to solve the problem of heat dissipation of outdoor high-power LED lighting fixtures, we should start with the heat material, selected to play the function of the material can be better radiator.
Outdoor lighting work environment is complex, is affected by temperature, humidity, ultraviolet radiation, wind rain and snow, dust, chemical gas and other natural conditions, so the radiator material has some characteristics: high and low temperature resistance, aging resistance, waterproof etc.. Outdoor high-power LED lighting radiator mainstream or use of copper or aluminum alloy and other metal materials. Thermal conductivity of metals in nature is the best, especially the comprehensive cost-effective copper, aluminum is the best. But taking into account the aluminum better ductility and processability, high-power radiator we are made of aluminum alloy.
LED street lamp and other outdoor high-power lighting weight is mainly determined by the weight of the radiating device. As the power increases, the radiator size and weight are also requires a corresponding increase, will put forward higher requirements on the chip and the bracket. Therefore, the weight loss is particularly necessary. In addition to the use of plastic, ceramic can also reduce the weight of lamps and lanterns, but ceramic and plastic bag ceramics and other materials mainly in indoor lighting useful to. Because the ceramic itself more brittle, machining performance is not high, so are generally used in the following LED on 10W. Like LED lights, LED landscape lighting outdoor high-power lighting rarely useful to, the existing technology, technology do not support high power LED ceramic parts. For a function of cooling the workpiece is concerned, the thermal conductivity is not single speak. Especially high power LED high cooling requirements for radiation and convection heat dissipation methods is crucial.
Cooling mode is the key, with the rapid development of LED technology, many products on the market is becoming more and more small, especially the miniaturization of high-power LED products. Using high power LED street lamp as an example, the use of power unit is more and more big area, the heat generated by increased; in order to ensure that the lamp can run reliably, the heat generated by the product moment must be discharged in time, prevent heat accumulation (LED junction temperature is generally 125 DEG C) the actual life and influence products. Through the comparative analysis of performance of LED and heat distribution of various thermal materials, can find the key to solve the LED solves the LED radiation problem is not looking for high thermal conductivity materials, but change the LED radiating structure or cooling mode. From the point of view of thermodynamics, heat transfer mode is divided into radiation, convection, conduction, the heat conduction of the fastest. Therefore, in the design of high power LED heat radiation are generally embedded heat radiating tube reference common IT (thermal column) combined with external heat sink, in the specific operation of the manufacturers and depending on the level of Technological Development in various forms. While the use of active cooling fan due to the limited conditions, basically been abandoned.
Important products, the overall level of service is more important. We are now produced and sold lighting has not only sold to customers radiator, will meet customer needs, providing the overall solution to the. Only the overall thermal solutions to help customers to save a lot of time and cost.
Quick replace traditional lamp also exposed some problems in the LED street lamp: poor heat dissipation caused by leakage phenomenon emerge in an endless stream. The heat dissipation capability directly influences the reality of LED light-emitting efficiency and life expectancy, so heat and excellent design is the key must be considered. In fact, I feel to want to solve the problem of heat dissipation of outdoor high-power LED lighting fixtures, we should start with the heat material, selected to play the function of the material can be better radiator.
Outdoor lighting work environment is complex, is affected by temperature, humidity, ultraviolet radiation, wind rain and snow, dust, chemical gas and other natural conditions, so the radiator material has some characteristics: high and low temperature resistance, aging resistance, waterproof etc.. Outdoor high-power LED lighting radiator mainstream or use of copper or aluminum alloy and other metal materials. Thermal conductivity of metals in nature is the best, especially the comprehensive cost-effective copper, aluminum is the best. But taking into account the aluminum better ductility and processability, high-power radiator we are made of aluminum alloy.
LED street lamp and other outdoor high-power lighting weight is mainly determined by the weight of the radiating device. As the power increases, the radiator size and weight are also requires a corresponding increase, will put forward higher requirements on the chip and the bracket. Therefore, the weight loss is particularly necessary. In addition to the use of plastic, ceramic can also reduce the weight of lamps and lanterns, but ceramic and plastic bag ceramics and other materials mainly in indoor lighting useful to. Because the ceramic itself more brittle, machining performance is not high, so are generally used in the following LED on 10W. Like LED lights, LED landscape lighting outdoor high-power lighting rarely useful to, the existing technology, technology do not support high power LED ceramic parts. For a function of cooling the workpiece is concerned, the thermal conductivity is not single speak. Especially high power LED high cooling requirements for radiation and convection heat dissipation methods is crucial.
Cooling mode is the key, with the rapid development of LED technology, many products on the market is becoming more and more small, especially the miniaturization of high-power LED products. Using high power LED street lamp as an example, the use of power unit is more and more big area, the heat generated by increased; in order to ensure that the lamp can run reliably, the heat generated by the product moment must be discharged in time, prevent heat accumulation (LED junction temperature is generally 125 DEG C) the actual life and influence products. Through the comparative analysis of performance of LED and heat distribution of various thermal materials, can find the key to solve the LED solves the LED radiation problem is not looking for high thermal conductivity materials, but change the LED radiating structure or cooling mode. From the point of view of thermodynamics, heat transfer mode is divided into radiation, convection, conduction, the heat conduction of the fastest. Therefore, in the design of high power LED heat radiation are generally embedded heat radiating tube reference common IT (thermal column) combined with external heat sink, in the specific operation of the manufacturers and depending on the level of Technological Development in various forms. While the use of active cooling fan due to the limited conditions, basically been abandoned.
Important products, the overall level of service is more important. We are now produced and sold lighting has not only sold to customers radiator, will meet customer needs, providing the overall solution to the. Only the overall thermal solutions to help customers to save a lot of time and cost.
