OXIDIZED ELECTRODES AS OXYGEN DISPENSERS IN METAL HALIDE LAMPS

摘要

An electrode for dosing oxygen into a metal halide lamp, where the electrode supplies oxygen during lamp operation in an amount effective to maintain a wall cleaning tungsten halogen chemical cycle. Use of the oxygen dosing electrode increases the lumen maintenance of the lamp to 80% or higher at 6000 hours. A method for making an oxidized electrode for use as an oxygen dispenser into the discharge vessel of a metal halide lamp is also provided.

主权项

1. An electrode for dosing oxygen into a metal halide lamp, wherein the electrode comprises a tungsten tip, a molybdenum region, and a niobium leadwire, and wherein either the tungsten tip or the molybdenum region, or both, is oxidized; and
wherein the oxidized portion supplies oxygen during lamp operation in an amount effective to maintain a wall cleaning tungsten halogen chemical cycle.