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Halogen sealed-beam headlamps appeared on U.S. cars in 1979, to enable greater high beam intensity newly permitted by Federal Motor Vehicle Safety Standard 108 without unreasonably high lamp wattage. Eventually, halogen sealed-beam lights came to dominate the (U.S.) automotive lamps market.
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]
Vision-Aid headlamps came in standard 7" size for traffic and weather use. Their 1959 A-21 Lamp Catalog provided physical and electrical specifications of 284 miniature and sealed beam lamps. [116] Tung-Sol 5.75' high and low (2 marking) beam headlights with TS logo after 1964 production change on original 1970 AMC Rebel
[2] [3] [4] Tail lights and brake lights were introduced around 1915, and by 1919, low-beam or dipped beam headlights were available. Sealed beam headlights were introduced in 1936 and standardized as the only acceptable type in the US in 1940. Self-cancelling turn signals were developed in 1940.
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.
R31 — Halogen sealed beam headlamps emitting an asymmetrical passing beam and/or a driving beam; R45 — Headlamp cleaners; R98 — Headlamps equipped with gas-discharge light sources; R99 — Gas-discharge light sources for use in approved gas-discharge lamp units of power-driven vehicles (See: Automotive lamp types) R112 — Headlamps ...
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