摘要 |
A high-intensity discharge (HID) lamp comprising an inner bulb ( 1 ) with a discharge vessel ( 11 ) and an outer bulb ( 2 ), especially for application in an automotive headlight unit is disclosed. A lamp design is proposed by which high thermal stresses and increased quartz temperatures during run-up and steady state operation of the lamp are avoided so that the light output and the lifetime of the lamp is improved. This is substantially achieved by a positioning of the inner and the outer bulb ( 1, 2 ) such that a longitudinal axis of the inner bulb ( 1 ) is displaced in the operating position of the lamp above a longitudinal axis of the outer bulb ( 2 ) so that the distance between the discharge vessel ( 11 ) and the outer bulb ( 2 ) at the top side of the lamp is decreased and the distance between both at the bottom side is correspondingly increased.
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