The multi-domain operation of LEDs characterized by the tight coupling between their electrical, thermal and optical properties manifests not only on chip and package level, but has to be tracked on LED products of higher integration level such as LED modules or LED luminaires. At present the system level numerical analysis of such integrated LED products is typically performed by the different design teams dealing with the electrical, thermal and optical design separately. One reason of this practice is the lack of a unified modeling approach in which the right models are used for the chip, package, module and luminaire (system) level. Spice-like LED models can address this issue. The present paper describes how thermal network models of luminaires can be created in an automated way to allow system level multi-domain simulations of complete LED luminaires.

Based on prior paper on multi-domain modeling of LEDs this paper provides an overview of the implementation issues of such model. On one hand the option of simplifying SPICE like macro models by using a commercial, fully coupled electro-thermal simulator is shown. On the other hand implementation details of an LED model are shown in which the current components responsible for heat dissipation and light emission are described separately. Using the current component responsible for light emission the radiant flux of the LED can be calculated directly. As a novelty in LED multid-domain modeling, using the "efficacy of radiation of the light source" is proposed for modeling the emitted luminous flux. The applicability of this quantity is demonstrated by an example.

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