LM-80 LED light measurement using LISUN goniophotometer

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The Illuminating Engineering Society (IES) developed the LM-80 testing standard as a means of assessing the efficiency of light-emitting diodes (LEDs) and other solid-state lighting devices. When measuring the lumen maintenance of an LED light source over time, the circumstances of the test, the methods to follow, and the criteria for reporting are all specified by the standard. The LM-80 test was developed with the intention of furnishing LED producers as well as end users with data that is dependable and consistent about the LEDs' long-term performance.

The results of the tests are often presented as the average lumen maintenance at various intervals, such as 6,000 hours, 12,000 hours, and so on, up to a maximum of 50,000 hours. For example, a 6,000-hour test may report the average lumen maintenance after 12,000 hours. After that, the data from the test is utilized to make a prediction of the LED product's lifespan, which is referred to as L70. This standard is acknowledged on a global scale and is used to evaluate the dependability and performance of LED and SSL items.

Gonio spectrometer, lighting specifiers, and lighting manufacturers all place a significant importance on LM-80. It offers a standardized approach for evaluating LEDs and displaying the test results in such a way that the data from various brands and models can be immediately and objectively compared to one another.

The LM-80 is designed to measure the two characteristics of LED quality that are the most crucial:

Lumen depreciation. All LEDs have a progressive decline in their lumen output over time, which is also referred to as their luminous flux at times. In common parlance, they become less bright. Depreciation of the luminosity is what you see here. However, the rate of lumen depreciation differs depending not only on the brand and type of the LED but also on the temperature at which it is operating. When compared to lower temperatures, the rate of lumen depreciation is much faster when it occurs at higher temperatures.

It is important to keep in mind that an LM-80 compliance test will not provide any helpful data relating to absolute lumen output or energy efficiency. A report from a photometric test that complies with LM-79 is necessary to access this data.

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