Ceramic envelope device, lamp with such a device

Details Ceramic envelope device, lamp with such a device Ceramic envelope device, lamp with such a device

H - Electricity

01

J

H01J 61/30 (2006.01) H01J 9/30 (2006.01) H01J 9/32 (2006.01) H01J 61/36 (2006.01)

Patent

CA 2230879

This invention involves a new type of feedthrough-plug member for metal halide 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, Hg, Sn, and inert gases. The PCA vessel and directly sealed cermet-feedthrough assemblies allow the metal halide lamps to operate at high wall temperatures with better lumen output, color temperature, and CRI.

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