are primarily used to provide frontal illumination for improved visibility during nighttime driving. Vehicle headlights are adapted to project either a low beam or a high beam by causing the light from a light source
bulb to be reflected in a forward direction. High beam and low beam headlights either in separate light bulbs or implemented by dual filaments and lens in a single bulb project different light patterns. The high beam state is used while driving on roadways without the presence of preceding or on-coming traffic. The low beam state is used during most nighttime driving conditions so as to enable the driver to see the roadway ahead while limiting dazzling glare that would otherwise result from use of the high beam state. A car headlight generally includes a reflector unit composed of a reflector and a light source bulb attached to the reflector, and a lens arranged in the front of the reflector unit. A halogen lamp is widely used in a conventional headlight. The halogen lamp is provided with two filaments, including a filament for irradiating a high-beam and a filament for irradiating a low-beam, so a high-beam mode or a low-beam mode may be selectively operated as desired. In recent years, metal halide lamps are increasingly used in replacement of a conventional tungsten halogen lamp. The metal halide lamp has the advantage that it can achieve a luminous flux three times as high as that of the conventional tungsten halogen lamp.
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