What does LM79/LM80 standard LED tube mean?
The main test of IES LM-79 is photoelectric performance test. The main test items are as follows: total luminous flux, luminous efficiency, light intensity distribution, correlated color temperature (CCT), color rendering index (CRI), chromaticity coordinates (or chromaticity coordinates) , Input AC (or DC) voltage, input AC (or DC) current, input power (DC or AC), input voltage frequency, power factor.
IES LM-80 mainly measures the lumen maintenance and life test of the LED light source, which usually takes 6000 hours.
1. In the ENERGY STAR/LM-80 specification, LED components must pass three different temperature tests. At each test temperature, at least 20 LED components must pass the 6000-hour test with a lumen maintenance rate. As the only basis for judging the success or failure of the test. The controversy lies in the fact that if the LED component does not light up or burns out during the 6000-hour test, it can not be included in the calculation of lumen maintenance. This alone will not meet the requirements for the calculation of the life of the LED component.
2. It is also feasible to use LM-80 test data as the basis for life calculation, as long as the failure modes are clearly defined as failures (for example: lumen maintenance, dead light, burnout, color coordinate/voltage/current deviation When any failure mode defined by failure occurs, it means that the life of the LED component is reached. In addition to the quality of the die, the selection of packaging materials to wire bonding technology all affect the life and reliability of LED components. Therefore, it is absolutely necessary to pass the "reliability qualification verification" for LED components that are to perform LM-80 or lifetime verification.
