Small metal halide lamp with sodium and scandium halides

Details Small metal halide lamp with sodium and scandium halides Small metal halide lamp with sodium and scandium halides

H - Electricity

01

J

313/11

H01J 61/18 (2006.01) H01J 61/34 (2006.01) H01J 61/35 (2006.01) H01J 61/44 (2006.01)

Patent

CA 1202664

Abstract of the Disclosure This invention provides a small metal halide lamp which has a power input of 100 W or less, provided with: an arc tube having a pair of electrodes spaced apart from each other and containing a rare gas, mercury, sodium halide and scandium halide therein; and an envelope for housing the arc tube. The mixing ratio of sodium halide to scandium halide based on weight is 3 : 1 to 10 : 1, and the total content of the sodium halide and the scandium halide is 10 to 40 mg per unit volume (cc) of the arc tube. At least one phosphor selected from the group consisting of a manganese-activated magnesium fluorogermanate phosphor and a cerium-activated yttrium aluminate phosphor is applied to the inner surface of the envelope. In addition, a green-emitting phosphor is preferably coated on the inner surface of the envelope.

418569

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