In this paper, degradation mechanisms of optical materials, used in the light emitting diode
(LED)-based products, are reviewed. The LED lighting is one of the fastest technology shifts …

High power white LEDs are replacing current lighting sources, not only for indoor usage, but
also for outdoor and harsher environmental applications. This calls for higher reliability with …

More and more mid-power white-light LED (MP LED) solutions have been used in outdoor
illumination due to their good performance, cost attractiveness, and low energy consumption …

Serious silicone carbonization has been reported in mid-power white-light LEDs during
highly accelerated temperature and humidity stress test, although the junction temperature …

Epoxy mold compound (EMC) and optical grade silicone based materials have been widely
used in manufacturing Light Emitting Diode (LED). Silicones are being used as encapsulant …

This paper demonstrates that chromaticity shifts in light-emitting diode (LED) devices arise
from multiple mechanisms that produce chemical changes in the materials used to construct …

Results from accelerated life tests (ALT) on mass-produced commercially available 6"
downlights are reported along with results from commercial LEDs. The luminaires capture …

With the recent improvements in LED luminous efficacy that have been achieved by the
lighting industry, greater attention is being devoted to understanding the long-term …

The primary objectives of this project was to develop and validate reliability models and
accelerated stress testing (AST) methodologies for predicting the lifetime of integrated SSL …

Over the past decades Light-emitting Diode (LED) devices have not only entered but
occupied large segments of the general lighting market due to their flexible control features …