Lifetime
LEDluminous_Manufacturer&Wholesale for High Power LED Spotlight,LED Bulb,LED Downlight,LED T8 Tube / 2009-08-19
LED light Lifetime
LED light lifetime mean how long it could keep its brightess.
It dont like the incandescent bulbs in that they lose their brightness over.
LED light average lifetimes is 50,000 hours.
Actually the LED light would declined to 80-90% of it's initial output,measured in lumens.
So,a 200 lumen LED light with a lifespan of 50,000 hours will have 160-180 lumens at the end of its lifetime.
LED reliability is inversely proportional to Tj (i.e. higher Tj = lower reliability). The graph below illustrates a typical curve of Tj vs. Lifetime. It shows that by maintaining Tj at 25°C designer can expect to have a lifetime of 300k hours continuous usage before the LED output intensity will degrade by 30%. However with a Tj of 50°C the LED will degrade 30% intensity in 50k hours.
