| 摘要 |
A protective coating (12) of suitable composition and thickness is applied to the inner surface of the arc tube (14) of a high-intensity, metal halide discharge lamp (10) in order to avoid a substantial loss of the metallic component of the metal halide fill and hence a substantial buildup of free halide, thereby extending the useful life of the lamp (10). A preferred lamp structure includes a fused silica arc tube (14) with a silicon coating (12). The silicon coating (12) is preferably applied to the arc tube (14) using a chemical vapor deposition process. <IMAGE> |
