Aging/Life Of LED

Aging And Lifetime Of Light Sources?

An incandescent lamp usually fades with a last bright twitch after reaching your life.

Aging Life Of LED
Fluorescent tubes or energy saving lamps are increasingly refusing to ignite until they have reached the end of their service lives.
With LED lamps everything is different!
LEDs lose their brightness over time, ie reduce their luminous flux over the operating time.
The degree of reduction is mainly determined by the operating temperature.
The main reason is the material changes in the LED (defects in the semiconductor crystal) and the opacity of the optics (comparable to a plastic pane that is becoming increasingly dull)
The warmer an LED is operated, the more frequently these material changes occur.
Low ambient temperatures or sufficient cooling (good dimensioning of the heat sinks) combined with good heat conduction therefore reduce the aging of an LED.
A lifetime indication allows most consumers to believe that the light source can be used without restriction for the entire period of time.
This is wrong!-Correct would be an indication of the aging rate or a supplementary indication of the luminous flux still usable after reaching the “lifetime”.
Serious manufacturers extend the indication of the lifetime by the value of the degradation (decrease/deterioration) and mark it with an “L“. ( L umen Maintenance; L umen maintaining)
Note:
The specification of the lifetime only makes sense in connection with indication of the degradation.
Eg lifetime: 50,000 hours/L70
(ie after 50,000 hours the LED still has 70% of its original brightness)

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