Return to the Lighting Forum | Post a Follow-Up

 o
LED brightness decay over time?

Posted by janesylvia (My Page) on
Thu, Feb 21, 13 at 3:43

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


Follow-Up Postings:

 o
RE: LED brightness decay over time?

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 < 1year).
Putting in extra lights is not the solution.


 o
RE: LED brightness decay over time?

Thank you very much, David.


 o
RE: LED brightness decay over time?

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


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Lighting Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here