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In the United States, entry 49 CFR 564 in the Code of Federal Regulations requires manufacturers of headlight bulbs, officially known as "replaceable light sources", to furnish the National Highway Traffic Safety Administration (NHTSA) with product specifications at least 60 days prior to first use. [6]
U.S. standard 7-inch headlamp combining low and high beam with turn signal lights below on a 1949 Nash 600 Glass-covered 5¾" sealed beam headlamps on a 1965 Chrysler 300 Rectangular sealed-beam headlamps with turn signal light below on a 1979 AMC Concord. Headlight design in the U.S. changed very little from 1940 to 1983. [7] [16]
Under ECE Regulation 37, which governs automotive filament lamps in most of the world, the H1 lamp's nominal rating is 55 W at 12 V, and its test rating is 68 W (maximum) and 1550 ± 15% lumens at 13.2 V. R37 also contains provisions for 6 V, 55 W and 24 V, 70 W H1 lamps. [1]
The first Ford Model T used carbide lamps for headlights and oil lamps for tail lights. It did not have all-electric lighting as a standard feature until several years after its introduction. Dynamos for automobile headlights were first fitted around 1908 and became commonplace in 1920s automobiles.
Xenon, or high-intensity discharge (HID), lighting provides brighter headlights and increases visibility of many peripheral objects (e.g. street signs and pedestrians) left in the shadows by standard halogen lighting. However, the bright headlights have given rise to complaints about glare. [10]
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 ...
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