Metal halide lamp used as a light source for vehicle headlights has a discharge container with an elliptical discharge chamber, and a pair of electrodes embedded in the container

摘要

Metal halide lamp has a discharge container with an elliptical discharge chamber (24); and a pair of electrodes (22A) embedded in the container, the tip of each electrode protruding into the discharge chamber. The discharge chamber contains mercury, a starter gas and a metal halide. The amount of metal halide included per volume unit of the chamber lies within a prescribed region so that the lamp is not extinguished.