LLMF = Lamp Lumen Maintenance Factor L70 = 0,7 L80 = 0,8 L90= 0,9

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One of the benefits of the LED , they have no filaments that may break, LED's can have long lifetime.

The light output from LED it slowly dims down over time.

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The amount of light from the light source at a specific time in the future is referred to as the lamp lumen maintenance factor ( LLMF )

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The lifetime of a LED module is defined as the time it takes until its light output, or lumen maintenance, reaches 70% of the initial output.

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This is also called L70. In other words,

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The luminaire standardised LED lifetime to L70 = 50000 hours, which corresponds to an LLMF of 0,7 as long as the lifetime of the lighting installation is set to the same amount of hours.