What is L70?

LED L70 lifetime chart showing lumen maintenance at 70% output

 

In the LED lighting industry, L70 is a metric that defines the useful lifetime of an LED product. It refers to the number of operating hours until the LED’s light output (luminous flux) has decreased to 70% of its initial value.

For example:

If a product is rated L70 = 50,000 hours, it means that after 50,000 hours of use, the LED is expected to produce 70% of the light it emitted when new.

Why 70%?
Because the human eye typically does not notice gradual reductions in brightness until the loss reaches around 30%, That has become the industry standard benchmark for end-of-life in LEDs.

If the L70 of an LED lights is greater than 50,000 hours, it can bring you better energy saving and economic benefits.

 

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