A modeling methodology to speed up the design of luminaires composed of solid state light emitting devices has been elaborated in the Delphi4LED research project of the European Union. Starting with integrated and automated measurements of packaged LED devices in the electric, thermal and optical domain; the methodology provides SPICE like models, which besides the electrical properties also reflect the thermal and optical ones.
The electrical and optical model is based directly on semiconductor physics, for precise modeling of the low-current and high-current decay of efficiency. The compact model of the thermal domain is based on the methodology defined in the previous DELPHI project. Measured data on the population are converted in an optimization process to best fit the model parameter sets.
The paper presents the elaborated methodology and also outlines a new JEDEC standard encompassing multiple thermal test environments.