Traditionally incandescent and fluorescent light sources were
mostly used in a single operation point and their relevant
characteristics was described by a few parameters in a
datasheet. The emitted light of LED products depends on
current and temperature heavily and the behavior of LEDs in
actual use can be predicted only by complex models of
physical roots. The paper summarizes the targets and
methodology of the European Delphi4LED project aiming the
elaboration of relevant measurements for identifying
parameters of electrical-optical-thermal LED models.
Measurement examples of high power LEDs are shown and the
state-of-art of the modeling efforts is demonstrated in case
studies.
The two-diode Spice-like electro-thermal-optical model of
LEDs is proposed to be extended with a serial resistor in the
branch describing the light emission.
