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Relationship between Lumen Degradation and Ambient Temperature of LED Luminaires.

Accel
Hello Everyone,


I would like to ask how would someone calculate the lumen degradation of a certain LED Luminaire in varying ambient temperatures.

For example, this luminaire from TRILUX -------->https://www.trilux.com/products/en/7650B-LED4000-840-ET-05/

It has a mean rated service life L85 (50 deg C) = 50 000 hrs

How would I calculate in order to get the L value at e.g. t = 25 deg C?

TRILUX has their own Lifetime Calculator and it gave an L value of 94.

How did they arrive with that value? Does it have a formula or only a rule of thumb?


Thanks,
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  • Former Community Member
    0 Former Community Member
    Slight divergence, I recall LEDs being advertised with 50,000 hrs and have recently noticed that some are now 30,000 or even 20,000 hrs...............


    I put up 11 x 1800 mm "quality" high output LED three years ago in an industrial unit using them 60 hours or so a week, and 5 of them have part failure where a section anything from 100 to 400 mm is now black.


    So glad my policy of "customer expectation" meant it is the client's job to whine to everyone else bar me!


    Regards


    BOD
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  • Former Community Member
    0 Former Community Member
    Slight divergence, I recall LEDs being advertised with 50,000 hrs and have recently noticed that some are now 30,000 or even 20,000 hrs...............


    I put up 11 x 1800 mm "quality" high output LED three years ago in an industrial unit using them 60 hours or so a week, and 5 of them have part failure where a section anything from 100 to 400 mm is now black.


    So glad my policy of "customer expectation" meant it is the client's job to whine to everyone else bar me!


    Regards


    BOD
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