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Bulbs used for headlamps, turn signals and brake lamps may be required to comply with international and national regulations governing the types of lamps used. Other automotive lighting applications such as auxiliary lamps or interior lighting may not be regulated, but common types are used by many automotive manufacturers.
The first dual-filament halogen bulb to produce both a low and a high beam, the H4 (60/55 W @ 12 V, 1650/1000 lm ±15% @ 13.2 V), [94] was released in 1971 [13] and quickly became the predominant headlamp bulb throughout the world except in the United States, where the H4 is still not legal for automotive use.
In order to show compliance to FMVSS 108, the lens of each original equipment and replacement headlamp, daytime running lamp (DRL) and certain conspicuity reflectors must be marked with the symbol "DOT". [1]: S6.5, S8.2.1.3, Table III This symbol may also be applied to compliant signal lighting devices, but is not mandatory.
The extended lighting cycle usually ends when the vehicle's ignition has begun, or a gradual reduction in light emitted after a couple of minutes if the car is not started, called "theater" lighting. Interior lighting has been added on some vehicles at the bottom edge of the dashboard, illuminating the floor for front passengers, or underneath ...
Full-voltage vs. parking light headlamp on European-market Volkswagen, 2007. Depending on prevailing regulations and equipment, vehicles may implement the daytime-running light function by functionally turning on specific lamps, by operating low-beam headlamps or fog lamps at full or reduced intensity, by operating high-beam headlamps at reduced intensity, or by steady-burning operation of the ...
Under ECE regulations, H1 lamps are required to emit white or selective yellow light. [1] U.S. regulations require H1 lamps to emit white light. [2] Under both ECE and U.S. specifications, the allowable range of white light is quite large; some H1 lamps have a slight blue or yellow tint to the glass yet still produce light legally acceptable under the requirement for white light.
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