LED brightness decay over time?

janesylviaFebruary 21, 2013

A friend of mine told me that LED light's brightness would decay over time, Is it true? If it is true, I might consider installing 9 LED recess lights instead of 6 in living room.

Thank you very much.

This post was edited by janesylvia on Thu, Feb 21, 13 at 3:45

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David

Yes it will. However, the rated lifespan quoted for LEDs is the time taken to decay to 70% - more than 10 years.
Other lights also decay. For instance CFLs gradually lose output over a shorter period of time (in some cases Putting in extra lights is not the solution.

    Bookmark   February 21, 2013 at 10:31AM
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janesylvia

Thank you very much, David.

    Bookmark   February 22, 2013 at 3:48AM
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landscapelighting

I agree putting in extra lights is not the solution. Most LEDs are rated from 25,000-100,000 hours at L70. L70 is a 30% decrease in light output. The human eye can start to tell the difference when the light has dimmed 30%. This is reason why L70 (lumen depreciation to 70%) is important.

John Cambruzzi
Certified Landscape Lighting Specialist

    Bookmark   March 5, 2013 at 5:57PM
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