High-Intensity Discharge Lamps With High Color Rendering Indices Based on Molecular Radiation of Indium Iodide

This paper deals with mercury-free high-intensity discharges based on indium iodide, that are driven by guided microwaves at 2.45 GHz. The influences of different additives to the lamp on the luminous efficacy as well as on the color rendering index will be shown. Furthermore, the spectral output of pure indium iodide lamps, using argon as auxiliary gas, will be explained by a combination of indium line radiation and molecular emission of the indium iodide molecules. A theoretical model for the molecular emission is shown, which uses the semiclassical description of molecular radiation.