CERAMIC ENVELOPE DEVICE, LAMP WITH SUCH A DEVICE

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This invention involves a new type of feedthrough-plug member for metal hali de HID lamp using PCA envelopes. The construction of the lamp housing consists of a PCA envelope and specially designed axially graded alumina-metal cermet multi- layers to eliminate cracking in cermet or PCA due to thermal stresses arising from thermal expansion mismatch. The fills are metal halides such as Na-Sc-I, rare earth halides, H g, Sn, and inert gases. The PCA vessel and directly sealed cermet-feedthrough assemblie s allow the metal halide lamps to operate at high wall temperatures with better lumen output, color temperature, and CRI.