The problem of severe light decay of LED street lights needs to be solved from the fundamentals of LED heat dissipation technology . At present, the growth rate of LED street lamps in China is higher than that of countries. According to statistics, it is expected to be the first in the global market in 2013. Last year, the Ministry of Science and Technology of China decided that the “Ten Cities and Ten Thousand†semiconductor lighting application engineering pilot policy, although it is a model of economic development through market policies to create market demand, but the first-line response to the actual case of the manufacturer is not as expected.
The gap between policy and market, in addition to the LED standard has not been fully regulated for manufacturers to follow, another latent technical problem is "LED street light severe light decay", resulting in less than one year of installation LED street lights can not pass the use of unit certification acceptance. The aforementioned LED standard specification has unified the formulation of the problem, and it is possible to draw a final decision in the near future. As for the "severe light failure of LED street lamps", it is necessary to solve the problem from the fundamentals of LED heat dissipation technology .
Discussion on the Causes of LED Road Light Depletion
Temperature is actually the key issue of LED road lighting, and LED street lights are stuck in this link. Since the LED street lamp has higher luminous power than the household lamp, the manufacturer has painstakingly designed the heat sink substrate fin and the heat dissipation module. The assembly needs to be outside the lamp heat dissipation module to protect the weather from frost. Unexpectedly, this externally protected spray paint sealed the heat of the heat-dissipating module, resulting in poor heat dissipation and LED epitaxial light decay.
LED epitaxial luminescence heat energy belongs to a small range of concentrated heat energy. In the application of high-power street lamps, the power input power is also large, and the interface temperature of the LED is quite high. If the street lamp continues to work for a long time, if the heat dissipation module cannot effectively dissipate heat, Will affect the LED life and luminescence performance, such as the current LED street lights severe light decay is caused by these factors. LED street lights are used outdoors and have environmental and environmental interference factors. Therefore, most manufacturers use the anode treatment of LED street light radiators to protect them, or spray paint to avoid acid and alkali corrosion. The life of the anode treatment is not long, and it will oxidize and discolor for a long time. If you want to remove the heavy work, not only the time and labor will increase the maintenance cost; the paint protection cost is lower, the protection effect is good, but the general paint does not dissipate heat. Function, the paint itself will form a barrier function, which is equivalent to increase the thermal impedance of the LED street light radiator, not only does not help, but because the heat energy is blocked in the heat sink, the LED light power is reduced, and finally leads to severe light decay. The above has been a serious problem in the LED lighting industry, and it is almost the main reason why the public works LED street lights can not pass the procurement unit acceptance.
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