| 摘要 |
A vehicle headlamp 1 includes a first lamp unit 2 A which employs a discharge lamp 3 as a light source, and a second lamp unit 2 B which employs a semiconductor light-emitting element 5 as a light source. Lighting of the first and second lamp units is started substantially simultaneously, and, in conjunction therewith, the second lamp unit 2 B is lit during a period until the discharge lamp 3 has transitioned to a steady lighting state. Thus, insufficient luminous energy during the transient period is complemented. Illumination light patterns originating from a plurality of lamp units are superimposed, thereby obtaining a low-beam light distribution.
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