A method for operating a fluorescent lamp which is connected to a series resonant circuit with a resonant circuit inductance and a resonant circuit capacitance. A temperature sensor may be positioned in or near the flow of reductant and exhaust to measure the temperature of the reductant and exhaust. The invention further relates to moldings produced from these laser-markable flame-retardant molding compositions, and also to laser-marked moldings produced therefrom. An inner lumen is disposed within the heat transfer segments. An end portion of the first semiconductor fin and the second semiconductor fin are etched. We further describe a printing system capable of laying down said materials in a definite pattern.