Lumen maintenance simply compares the amount of light produced from a light source or from a luminaire when it is brand new to the amount of light output at a specific time in the future. For instance, if a luminaire produced 1000 lumens of light when it was brand new and now produces 700 lumens of light after 30,000 hours, then it would have lumen maintenance of 70% at 30,000 hours. Sometimes this is stated as lumen depreciation, which in our example would be 30% lumen depreciation from the original light output. Lumen maintenance is often specified as L50, L70, L80, or L90. In each case, L stands for lumen maintenance and the number is the percentage of light output remaining.
The appropriate lumen maintenance target is usually based on the application and the requirements set forth by customers. Since the human eye generally can’t detect a change in light output until there has been 30% depreciation, L70 is often established as the target for an application. With LUXEON LEDs, it generally takes tens of thousands of hours before the LUXEON LED will lose 30% of its initial light output.
Philips Lumileds technical advances in all areas have led to the industries longest lived, most reliable LEDs. LUXEON LEDs meet the LM-80 test criteria developed by the Illumination Engineering Society and the Department of Energy Solid State Lighting Standards Development group by a wide margin. Luminaire and lamp manufactures that use LUXEON LEDs can achieve Energy Star certification and ensure their products perform as promised.
What is Lumen Maintenance?
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