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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]
Goggomobils were exported to the United States. These were special export versions, with the 400 cc engine, an automatic gasoline-oil mixer, and 7-inch (180 mm) sealed-beam headlights as required by US regulations. [2] [3] [10]
Between 1940 and 1956, all U.S. cars had to have two 7-inch (178 mm) round headlamps with dual filaments, so each lamp provided both a high and a low beam light distribution. In 1957, a system of four sealed-beam headlamps—two per side, of 5 + 3 / 4 inches (146 mm) diameter, was allowed in some U.S. states.
The specifications supplied by the manufacturer, on approval by NHTSA, are entered in Federal docket NHTSA-1998-3397. [7] From then on, any light source made and certified by any manufacturer as conforming to the specifications is legal for use in headlamps certified as conforming to Federal Motor Vehicle Safety Standard 108 .
A top most number as 1 indicates a high beam lamp and a 2 indicates a low or twin beam lamp. Only 5.75' lamps were high or low beam, whereas 7' lamps were twin beam lamp with the 2 on the top most edge of the headlight. About 1967, American Motors Corporation had Tung-Sol headlights on all their passengers vehicles up to October 1974 data.
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. By 1945, headlights and signal lights were integrated into the body styling. Halogen headlights were developed in Europe in 1960.