LED Lifetime and Failure Rate

The light output of an LED module decreases over the lifetime, this is characterized by the L value.

L70 = 70% of its initial luminous flux; L90 = 90% of its initial luminous flux;

The B value defines the amount of modules which are below the specific L value.

L70 B10 = 10% of modules are below 70% of their initial luminous flux L90 B10 = 10% of modules are below 90% of their initial luminous flux

The C value defines the percentage of fatally failed modules.

F value = B + C

L70 F10 = 10% of modules may fail or be below 70% of their initial luminous flux L90 F10 = 10% of modules may fail or be below 90% of their initial luminous flux