Understand NOW what is LM-80, TM-21, LM-79 and L70?

With the growth of LED technology in the national market, manufacturers and distributors have used acronyms to represent the quality of their products, which is why terms such as: LM-80, TM-21, LM-79 and L70 often appear. However, did you know that these acronyms do not guarantee the quality of an LED lamp or lamp?

Some people think, for example, that LM-80 and LM-79 are standards, but they are test procedures, published by IESNA (Illuminating Engineering Society North America). This means, in other words, that these acronyms are methods that are used to verify the maintenance of the luminous flux of LED sources and to make electrical and photometric measurements of LED products. So let’s stop confusing terms! Check out the function of each of these acronyms in this article. Follow along!


It is a test procedure for LEDs and LED modules. This procedure does not consider thermal, optical and controller components. This procedure seeks to obtain information about the maintenance of the luminous flux and the changes that may occur over time in chromaticity. This is done by taking measurements over at least 6000 hours of life, at 1000 hour intervals.

With the result of the LM-80 it is possible to check whether the depreciation of the LED, together with the temperature at which the LED will operate inside a luminaire or lamp, will be adequate or not for the desired useful life. And from there, establish the useful life of the product through extrapolations in accordance with publication TM-21, which we will see below.


TM-21 is a test and extrapolation procedure, based on the results of LM-80, which defines the depreciation of the luminous flux as well as the useful life of LED luminaires and lamps. In other words, it is a calculation to accelerate the depreciation of the luminous flux, which allows you to calculate the useful life of an LED luminaire or lamp.

L90, L80, L70

After the useful life results provided in the TM-21 calculations, the acronym L + the percentage of luminous flux that the luminaire or lamp will have in a given useful life is used. To better explain this topic, understand that, for example, an LED luminaire has a useful life (according to TM-21) of 60,000 HOURS, with the depreciation of the initial luminous flux by 30%. If the depreciation is 30%, the luminaire will remain at 70% of the initial luminous flux after 60,000 hours. Therefore, the useful life can be demonstrated as 60,000 hours at L70. If the depreciation of the luminaire’s luminous flux was 20%, it would be 60,000 hours at L80. If it were 10%, it would be 60,000 hours at L90 and so on.


Finally, LM-79 is a testing procedure that determines the electrical and photometric characteristics of an LED luminaire or lamp. To carry out this procedure, the luminaire or lamp must be in operation, so it is possible for it to present important results regarding its performance, such as:

  • Luminous Flux (lm)
  • Luminous Efficacy (lm/W)
  • Luminous Intensity (cd)
  • Correlated Color Temperature
  • Color Rendering Index
  • Luminous Intensity Distribution Curve
  • Power
  • Current
  • Frequency
  • Power Factor

We can conclude that the LM-80, TM-21 and LM-79 and L70 are testing methodologies and have nothing to guarantee whether the LED is good or bad. It is important to understand these acronyms to correctly interpret the information and thus be able to objectively compare the LED lamps and luminaires available on the market. 

For more information, please contact us.


Email: info@aikoled.com

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