LED light engine cold light efficiency and thermal efficiency of the actual test results

- Jun 22, 2017-

LED light engine cold light efficiency and thermal efficiency of the actual test results

We tested a 60W electrolytic capacitor light engine produced by Shenzhen company, and the 60W electrolytic capacitor light engine produced by Effair. The shape of the two photos are as follows:

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without electrolytic capacitor   electrolytic capacitor 60W light engine

  60W light engine


In the test with the same heat sink, so as to avoid the difference between the two different effects of the test results. The total luminous flux of these two light engines changes over time as follows:

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without electrolytic capacitor   electrolytic capacitor 60W light engine

  60W light engine


The total luminous flux of the former from the boot 5780lm, after half an hour down to 5120lm, down about 11.4%, and from the downward trend, it should be further down to 5000lm over time. While Effair's light engine luminous flux dropped from 7233.8lm to 6486.8lm.

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without electrolytic capacitor   electrolytic capacitor 60W light engine

  60W light engine


Its input power in 30 minutes from 57.81W rose to 59.53W. So its light efficiency is reduced from 100lm / W to 86lm / W, down 14%. If the final stable heat flux is 5000 lm, its final luminous efficiency is only 84 lm / W, down by 16%. And its nominal luminous efficiency is 100lm / W, if the cold light from the point of view, or to achieve, but if the thermal effect from the point of view, it was 16% worse.


The 60W electrolytic capacitor light engine, its power in 30 minutes from 62.53W down to 60.354W (closer to the rated value of 60W), so its light efficiency from the beginning of 115.68lm / W, Down to 107.48lm / W, only down 7.1%, and the general decline in the scope of similar lamps. This is equivalent to the LED junction temperature from 25 degrees room temperature rise to the design of the rated value of about 85 degrees junction temperature caused by the normal light effect decreased. This is because Effair's constant current source efficiency is as high as 99%. So the integration of such a high efficiency constant current source to the aluminum substrate is not increased after the heat stability of the LED junction temperature. So the difference between cold light efficiency and thermal efficiency is still within the range of normal values.


By the way, we are here to compare the difference between the two light engine is not due to the light of the LED itself caused by different light effects, the former company's electrolytic capacitor light engine used by the LED is a large chip 3535 An area of 1225mil2, and that Effie's electrolytic capacitor light engine used in the LED is 3518, its area is only 630mil2, a difference of up to 595mil2, but also the former is large. The absolute value of the thermal effect of Effie is also up to 107.48lm / W, much higher than the company's 86lm / W as much as 25%.


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