The presence of mid- and high-power LEDs in lighting applications is ordinary and
widespread. Appropriate life testing and modelling techniques have a great potential
in further optimizing both the efficiency and reliability of LED based light sources.
A combined electrical, thermal and optical simulation in a Spice-like environment
allows fast and accurate system level modelling of even a whole LED based luminaire,
provided that the compact models of necessary circuit elements are already available.
The work described in this paper aims to make a step forward in LED multi-domain modelling
and incorporate elapsed lifetime dependence into an existing LED model. For this purpose,
a set of blue mid-power LEDs of a well-recognised vendor were exposed to a cyclic
moisture resistance test and an LM-80-08 based life test combined with the latest
LED modelling techniques.
