Discharge lamp and vehicle lamp

摘要

According to one embodiment, a discharge lamp includes a light-emitting part including a discharge space therein in which a metal halide and a gas are sealed, and a pair of electrodes which protrude toward an inside of the discharge space and are arranged to face each other while separated by a specified distance. Power consumption at a time of stable lighting is 20 W or more and 30 W or less. When a pressure of the gas sealed in the discharge space is X (atm), and a distance between a center axis of the electrodes and a surface of the metal halide is m (mm), a following expression is satisfied: 0.085≦m/X≦0.12.

主权项

1. A discharge lamp comprising:
a light-emitting part including a discharge space therein in which a metal halide and a gas are sealed; and a pair of electrodes which protrude toward an inside of the discharge space and are arranged to face each other while separated by a specified distance, wherein:
power consumption at a time of stable lighting is 20 W or more and 30 W or less, andwhen a pressure of the gas sealed in the discharge space is X (atm) at room temperature (25° C.), and a distance between a center axis of the electrodes and an upper surface of the metal halide, when the discharge lamp is arranged horizontally, is m (mm), a following expression is satisfied: 0.085 (mm/atm)≦m/X≦0.12 (mm/atm), the distance being measured perpendicularly to the center axis of the electrodes.