Harison Toshiba Lighting Corporation

Kosuke Ueda

Makoto Deguchi

Masahiro Doi

Osamu Shirakawa

Takuya Abe

A mercury-free vehicle discharge lamp is described as including a discharge space with electrodes, wherein a spherical length b, which is a length in a tube axial direction of the light emitting part is 7.5 mm to 8.5 mm and a thickness volume V of the light emitting part is 50 mmto 100 mm, and wherein the following formula is satisfied: &#x2212;20&#x2266;(a&#x2212;35)&#xd7;5.5+(x&#x2212;13.5)&#xd7;10 +(1.85&#x2212;t)&#xd7;100+(2.5&#x2212;d)&#xd7;100&#x2266;20, a: power W supplied in a stable lighting time, x: pressure [atm] of rare gas sealed in the discharge space ranging 10&#x2dc;17 atm, t: thickness [mm] of a part where a wall with maximum thickness and ranging 1.30&#x2dc;1.85 mm, and d: inner diameter [mm] of a part where the wall with maximum thickness.

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Imabari, Japan

Kosuke Ueda