HIGH EFFICACY METAL HALIDE LAMP WITH PRASEODYMIUM AND SODIUM HALIDES IN A CONFIGURED CHAMBER

摘要

An arc discharge metal halide lamp for use in selected lighting fixtures having a discharge chamber with light permeable ceramic walls of a selected shape about a discharge region of a selected volume. A pair of electrodes are supported in the discharge region separated from one another by a separation length. The separation length is in a ratio to the effective inner diameter that is greater than four. Ionizable materials are provided in the discharge region comprising a quantity of mercury in a ratio to the discharge region volume that is less than 4 mg/cm³, a noble gas, praseodymium halide, and sodium halide.