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High Bay LED Lighting Driver Heat Dissipation Temperature Test Report |
| Author： Date：6/21/2011 1:33:27 AM |
High Bay LED Lighting Driver Heat Dissipation Temperature Test Report
As we all know, a good LED could last very long up to 50,000 hours with with a good heat sink. But please don't forget the driver also needs very good heat dissipation too. For common LED drivers there is at least one component is very weak. It's the electrolytic capacitor.
Typical temperatures for the how electrolytic caps are 85C and 105C. Usullay the life time is 2000 or 3000 hrs at one of the above temperatures. This is how electrolytic caps are specified. But the cap's life doubles for every 10C below that temperature. A typical improvement of a factor of 2 for every 10 degrees °C lower can be gained. So if you go 40°C below the specified temperature, you gain a factor of 2^4 = 16. 16× 3000 hours = 48,000 hours. Even 16× 2000 hours =32,000 hours.
Let's see what's the temperature for each component of our high bay LED lighting driver, especially pay attention to electrolytic capacitor temperature.
The wires you are going to see in the high bay LED lighting driver are temperature sensors.
Temperature Test Result:
Inductor: 54.0°C
Electrolytic Capacitor: 59.6°C
Transformer: 70.5°C
Diode: 63.8°C
PFC MOS: 55.8°C
Bridge: 63.3°C
PCB: 61.3°C
Ambient Temperature: 27.1°C
So you can see that the electrolytic capacitor temperature is only about 60°C based on the ambient temperature of 27.1°C. 45°C lower than the rated temperature. So it could last as long as 50,000 hours based on the Ambient Temperature of 25°C.
When you are choosing the LED high bay lighting, please don't forget to test the electrolytic capacitor temperature by youself. Lots of suppliers offer the high bays driver with caps more than 80 °C, the LED high bay only can last about 2 years.
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