The 2 main components in LED Lights are the LED/LED module which provides the light and the Driver which regulates electrical supply to the LEDs.
DRIVER DEFINITION: An electrical device which regulates the power to an LED. This is usually the weakest electrical part of an LED Light with shorter life and less reliability compared to the LEDs themselves.
DRIVER LIFE: If 100,000 hours is advised by Driver Manufacturer, this implies that 90% of Drivers installed (under normal conditions, and out of a large population) will be expected to survive for this period.
The Luminaire manufacturer who incorporates these Drivers into his Luminaires must ensure compliance with the Driver restrictions, in order to achieve the lifetime advised.
eg. When Luminaire operational, that the Driver will operate below specified heat limits.
Measurement is typically shown in a format like this Example: L70 100,000 hours B10
L70 = 70% Lumen Output at End of Life.
B10 = By End of Life, 90% or more LED modules are working properly.
The Example above means that after 100,000 hours operation, the Lumen output from at least 90% of the LED modules is expected to be 70% or more.
LIFETIME NOTES: Certain assumptions are made by LED, Driver and Luminaire manufacturers – typically Ambient Temperatures (Luminaires are usually tested in 25°C ambient), electrical supply tolerances, etc and Testing is in Laboratory conditions, so actual lifetimes may vary from those advised and may vary from Project to Project. Some Luminaires are designed for disposal after failure or end of life. Other Luminaires are designed so that the Driver and/or LEDs can be replaced to give the Luminaire a new extended period of life.