Nowadays the demand for thermal standards for
power LEDs is increasing. On the one hand metrics for fair
comparison of competing products are needed, on the other
hand, designers of power LED based applications demand
reliable and meaningful data for their daily work. Today's data
sheet information does hardly meet any of these requirements.
Part I compares the current situation in the LED world with
the situation in the IC world over twenty years ago, observes
that much can be learned from the progress achieved, and
concludes with a proposal for action. Part II addresses thermal
issues that are specific to light emitting diodes (in fact, also
semiconductor devices), the drawbacks of the current situation
with respect to the information in the data sheets, and
emphasises the need for electro-thermal models.