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During a headlamp inspection, the vehicle headlamp is aimed through the lens, projecting the headlamp pattern at an aiming screen target which has lines showing the desired headlamp pattern. For low beam, this pattern is symmetric for the United States, asymmetric for the rest of the world. The screen will either be adjusted for, or directly ...
Because of the increased amounts of light available from HID lamps relative to halogen bulbs, HID headlamps producing a given beam pattern can be made smaller than halogen headlamps producing a comparable beam pattern. Alternatively, the larger size can be retained, in which case the HID headlamp can produce a more robust beam pattern.
Federal Motor Vehicle Safety Standard 108 (FMVSS 108) regulates all automotive lighting, signalling and reflective devices in the United States.Like all other Federal Motor Vehicle Safety Standards, FMVSS 108 is administered by the United States Department of Transportation's National Highway Traffic Safety Administration.
Replaceable Light Sources for Vehicle Headlamps; Bulb Type Trade Number Cap (Base) Filaments Nominal power @ 12.8v (High/Low beam where applicable) Comments Image HB1 9004 P29t 2 65 / 45 W HB2 9003 P43t-38 2 60 / 55 W H4 with stricter geometric tolerances HB3 9005 P20d (90°) 1 65 W HB3A 9005XS P20d (straight) 1 65 W HB3 w/180° straight base ...
The following suffixes are commonly used with PAR lamps to indicate their beam width: [5] PAR lamps are also manufactured to produce beam patterns specific to the needs of particular applications, such as low-beam and high-beam headlamps and fog and driving lights for vehicles, and warning lamps for school buses.
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