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Depth profiling: how to determine the LED lighting lamps and lanterns

If a city's sewer represents the conscience of the city, so, for the lamps and lanterns, heat dissipation is a easy to be ignored conscience. As efficient cold light source, LED the "cold" attribute to its built-in chip is very "can't stand the heat," relative to the high level of appearance design, fine circuit configuration and proper optical design, lamps and lanterns of the cooling performance is good or bad to some extent greatly affects the people judge the lamps and lanterns of what "good".
Now, each big manufacturer has to do the LED lamps and lanterns of the initial photosynthetic efficiency, let a person resembles a glance, even professional designers and engineering contractor when choosing lamps and lanterns of products is also difficult to close, the so-called said, the tide goes out, didn't know who's been swimming naked, the lamps and lanterns of "poor quality" after "high quantity of heat to import" tide gradually leaks out "pants", in the light of time, gradually get longer luminous efficiency and quality are no longer at the beginning, the recession is differ, quality degree.
So, who influence such as photosynthetic efficiency attenuation speed and even the stability of the lamps and lanterns? The cooling performance.
LED the luminous efficiency and life is closely related to working temperature, of course, the quality of the whole lamp by the LED chip, chip substrate, encapsulation shell and so on factors, circuit design, lamps and lanterns, heat dissipation technology evolves to make these parts can play a greater effectiveness, however, the actual application in the process of perception alone lamps and lanterns is stable and reliable or not, to determine the performance of the radiator was good or bad it does not seem easy. This issue we opted for a high power based on the technology of flip chip solar-thermal integration heat dissipation solutions in industrial and mining lamp product assessment, energy-saving technology co., LTD. In Beijing red mulberry as the sample source, and invite the shenzhen city - product technical service co., LTD. As a third party testing institutions for product test data, in order to show more scientific based on the performance of the cooling technology under the whole lamp, provide valuable reference for the user.
Laboratory based on nominal maximum and minimum voltage load, the lamps and lanterns in different frequency under the condition of rated power of the measured power and current changes, the data showed that the measured power under different voltage and frequency and power rating a slight difference, but the power factor are very close to 1.0, reflects its high level of efficiency of power supply system.
Temperature effect on the performance of the LED there is no doubt that NadarajahNarendran in different temperature conditions on the white LED (LumiledsStar structure), light temperature experiment proved the important influence of the temperature for the LED life, LED light source under different temperature conditions the working temperature of the chip (junction temperature) is one of the important performance index of LED lamps and lanterns.
As you can see, the light up about 1 hour and 40 minutes, the temperature of different parts of lamps and lanterns to steady-state value, solder joints from a source to the substrate, and then to the radiator cavity, distal fin on the back, can see clearly the LED heat dissipation path around the cooling efficiency. Light spot as the junction temperature of lamps and lanterns of important factor calculation, the temperature is also directly affect the LED junction temperature of high and low, especially in the design of high power LED heat dissipation, TJ junction temperature of LED light rate and life expectancy is of great significance, with reference to the light source LM - 80 report, its in good condition under the temperature 85 , so the solder joint temperature 80.5 is perfectly acceptable.
In addition, the concrete analysis, the steady-state temperature at various points can effectively determine the position analysis of the actual heat dissipation performance.
You can see that the heat taken from the radiator surface and radiator cavity on the back of the temperature difference is only 2.2 degrees, reflected the good capability of heat conduction and radiator are warm, show that the radiator thermal conductivity, heat dissipation performance is very good. The most important point, analysis the lamps and lanterns' integral structure design, combined with light source inversion principle, can be found that PN section from a source to the far end radiator, the heat flow channel without the bottleneck, and compared with the traditional process with less light substrates, thermal conductive path short a lot, thus reflect the temperature, the more close to the PN section of the actual temperature.
The lamps and lanterns structure combined with the actual temperature, we place to further to analysis, the structure of the radiator in hot plate to replace the traditional light source base board, do not need to apply silicon lipid padding between radiator and light source, improve the stability and longevity. Unique lens solid structure also is helpful for light source cooling, at the same time avoid traditional lens effect caused by breathing air impurities to the injury of the light source.
Of course, in addition to the temperature characteristic test, the basic performance of lamps and lanterns to light quality and efficiency are equally important.

----------Archled Technology Co.,Limited
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