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Below the low beam filament is a cup-shaped shield (called a "Graves shield") spanning an arc of 165°. When the low beam filament is illuminated, this shield casts a shadow on the corresponding lower area of the reflector, blocking downward light rays that would otherwise strike the reflector and be cast above the horizon.
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 ...
UN ECE regulations for dipped beam headlights specify a beam with a sharp, asymmetric cut-off; the half of the beam closest to oncoming drivers is flat and low, while the half of the beam closest to the outside of the road slopes up and towards the near side of the roadway. This permits a functional compromise where it is possible to ...
ECE nominal luminous flux: 26/1350 ±10% Low-wattage filament for DRL function H16 1 12 V: 19 W PGJ19-3 H16B 1 12 V: 19 W PGJY19-3 H21W 1 12 V & 24 V: 21 W BAY9s H27W/1 1 12 V: 27W PG13 USA ANSI № 880 H27W/2 1 12 V: 27 W PGJ13 USA ANSI № 881 HB3 1 12 V: 60 W P20d 90° USA, Japan ANSI № 9005 ECE nominal luminous flux: 1700 lm ±15% HB3A 1
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 following year in 1958, all ...
A headlight tester comprises a fully adjustable single optical collimated light lens assembly which is typically mounted on a vertical column or rail. The assembly is adjusted vertically to the actual height of the headlamp, which is typically around 500mm for passenger vehicles, but can be significantly higher for heavy goods vehicles (HGVs).
A headlamp, headlight, or head torch is a light source affixed to the head typically for outdoor activities at night or in dark conditions such as caving, orienteering, hiking, skiing, backpacking, camping, mountaineering or mountain biking.
Headlight flashing is the act of either briefly switching on the headlights of a car, or of momentarily switching between a headlight's high beams and low beams, in an effort to communicate with another driver or drivers.