Arc lamp assembly with containment means.

摘要

A metal halide arc lamp assembly has a configuration which provides improved containment performance in the event that the arc tube bursts. The lamp assembly includes a metal halide arc tube, a cylindrical quartz shroud surrounding the arc tube and a sealed outer envelope enclosing the shroud and the arc tube. The arc tube has press seals with a generally I-shaped cross section. The maximum dimension of the press seals perpendicular to the arc tube axis is not substantially greater than the maximum dimension of the bulb portion of the arc tube. The spacing between the outside surface of the bulb portion and the inside surface of the shroud is not greater than about three millimeters. <IMAGE>