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Growing preferences for high-velocity motor vehicles lead a strong demand for headlamps with higher brightness and visibility. The low beam of conventional two-lamp system headlamps provides drivers poor visibility, since they are equipped with bulbs which have low-beam filament with relatively small power (35-45W) and luminous flux, compared to the high-power filament (65W) used for high-beam, in order to restrain the glare to on-coming drivers. The new halogen bulb with C-8/C-8 filament structure has such high power as 65/55W and when used in combination with a multi-focus reflector to compose a new 2-lamp system headlamp, it significantly increases the brightness of low-beam without causing much glare to the on-coming vehicles. At the same time, this new 2-lamp system headlamp is able to illuminate a broad area including the zone just in front of the vehicle without sacrificing the visibility of farthest area.

Along with the tendency to esteem fuel economy, driving security and aerodynamic excellence, the voice to demand technical improvement of headlamps is getting higher and higher every day. With the expectation to meet such common and strong demand of world's automotive industry, retractable headlamps and slanting headlamps (headlamps of which front lenses are slanted) have been put to practical use so far. However, retractable headlamps have a disadvantage that once lighted, they lose their aerodynamic efficacy. Moreover, the mechanism of retractable headlamp system is rather complicated and causes cost increase. On the other hand, in slanting headlamps, light emission inefficiency that increases in proportion to the lens slant angle settles certain limitation on the popularity of this system.