An arc discharge vehicle lamp (10) for nebulous weather comprising a body (12) defining a chamber (14) having a volume of between 0.025 to 0.035 cc and including spaced apart electrodes (16, 18) having an arc gap (20) of between 2 and 6 mm; and an arc generating and sustaining medium (21) in the chamber for developing light having a color temperature between 1800K to 2800K during operation of the lamp. A preferred arc gap is 4.2 mm. The electrodes (16 and 18) are preferably fashioned with three parts; a niobium sealing region, an intermediate region of molybdenum and a tungsten region, which protrudes into the discharge chamber.
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