Reduced mercury ceramic metal halide lamp

H - Electricity – 01 – J

Patent

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Details

H01J 61/20 (2006.01) H01J 17/04 (2006.01) H01J 17/16 (2006.01) H01J 17/20 (2006.01) H01J 61/24 (2006.01) H01J 61/30 (2006.01) H01J 61/32 (2006.01) H01J 61/34 (2006.01) H01J 61/82 (2006.01) H01J 61/88 (2006.01)

Patent

CA 2450294

Arc tube (10) has a bulbous body (12) with a hollow center portion (14) and opposite ends (16, 18). Each of these ends has a cylindrical terminal-receiving section (20, 22) extending therefrom. The hollow center portion (14) has an internal length A and an internal diameter B that provides an aspect ratio of less than 5 and an outer surface area to inner surface area ratio, measured in square units, of less than 1.5. Electrodes (24) and (26) are hermetically sealed in the terminal-receiving sections (20, 22). The lamp uses less than 7 mgs of mercury. The low pressure operation allows the use of the arc tube in lamps without a shroud and the low mercury allow the lamp to pass TCLP requirement and be conventionally landfilled.

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