Metal halide lamp and lighting apparatus using the same
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsShunsuke Kakisaka, Masahito Yoshida
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Abstract
A metal halide lamp according to the present invention includes: an outer tube 2; an inner tube 3 that is provided in the outer tube 2, has a sealing portion 10 in at least one end portion, and is made of quartz glass; an inner tube 3 provided in the outer tube 2; and an arc tube 4 provided in the inner tube 3, wherein assuming that the outer tube 2 has a maximum outer diameter A (mm), the inner tube 3 has a maximum outer diameter B (mm), and the metal halide lamp 1 consumes P (W) of power, the following relationships are satisfied: 0.06P+15.8≦A≦25, 0.05P+9.0≦B, and 1.14≦A/B, where P satisfies 20 W≦P≦130W.
Claims4
A metal halide lamp comprising:
- an outer tube;
- an inner tube that is provided in the outer tube, has a sealing portion in at least one end portion, and is made of quartz glass;
- and
- an arc tube provided in the inner tube,
- wherein assuming that the outer tube has a maximum outer diameter A (mm), the inner tube has a maximum outer diameter B (mm), and the metal halide lamp consumes P (W) of power, the following relationships are satisfied:
- 0.06P+15.8≦A≦25,
- 0.05P+9.0≦B. and
- 1.14≦A/B,
- where P satisfies 20 W≦P≦130W.
Dependencies are inferred from the claim text.