DOE release SSL lamp accelerated life test report

DOE recently released the latest research results of the use of accelerated life testing (hammer test) in a reasonable range of time to test the failure of SSL lamps, the goal is to find the potential failure mode. The report submitted by RTI international to the DOE LED reliability alliance is titled "solid state lighting hammer test results.". The report shows that indoor SSL lamps will be subject to extreme environmental stress factors, including temperature cycle, temperature and humidity saturation, high temperature and power supply to provide electrical stress cycle.

The main test results released by the report include:

And all the lamps are able to withstand 100 times sudden changes of temperature (-50 DEG C to 125 DEG C).

About half of the lamps can withstand 300 times.

Failure occurs mainly in the drive circuit, the most common is the failure of the circuit board.

In 611, the detected lamp lamp can withstand LED accumulated about 1 million hours of hammer test, which is only 4 light - two brazed joints due to fatigue failure, the other two circuit board due to corrosion.

The test results show that the LED reliability of the lighting system is high, even under extreme conditions. In contrast, other lighting components are more likely to fail. It is necessary to do further research work in the study of wear mechanism, quantitative failure mode and determination of acceleration factors in order to estimate the life and reliability of DOE lamps.