Lamp models need data

Statistics – Applications

Scientific paper

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Optical Sources And Standards, Electric Discharges

Scientific paper

There are now very comprehensive computer models for the steady state operation of most lamp types of commercial importance. For historical reasons associated with computer power and availability of data most of these models arrived too late to assist the design of radically new lamp types, but they do provide excellent understanding of lamp operation. In the last decade models have often played a key role in lamp development. In the case of fluorescent lamps the collisional-radiative models are very complete, but accuracy still needs to be improved to turn them in to computer-aided design models for new lamp variants. The key to this is to improve the data, especially for ionization processes. In the case of high-pressure (HP) alkali arcs there has been remarkable success in calculating realistic spectra based on molecular energy levels. For HP metal-halide lamps energy balance models are very sophisticated but the data for calculating the radiation are far from adequate; semi-empirical treatment of radiation looks more hopeful. We are now entering an era in which computer power is adequate and calculated sets of self-consistent data for collision cross-sections will soon be available even for atoms with many electrons. Similarly good quality molecular energy levels and transition dipole moments for dimers containing heavy atoms look well within reach. .

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