Recent research has already proved that the characteristics of LED systems can be
analyzed creating multi-domain models with tightly coupled electrical, thermal and
optical operation. Transient models of the electric and thermal effects have been
already successfully established but experimental verification of the dynamic optical
behavior was neglected as fast radiometric and photometric measurements have not been
available. The present paper outlines two measurement techniques which extend the
methodology towards radiometric transients, calibrated by isothermal results. It proposes
adequate instrumentation and highlights metrology problems through a measurement example.
