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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 ...
Under ECE regulations, H1 lamps are required to emit white or selective yellow light. [1] U.S. regulations require H1 lamps to emit white light. [2] Under both ECE and U.S. specifications, the allowable range of white light is quite large; some H1 lamps have a slight blue or yellow tint to the glass yet still produce light legally acceptable under the requirement for white light.
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.
As automotive lighting improves, LEDs are emerging at the lead. Offering remarkable vision and longevity, they are a go-to for many safety-minded drivers.
The Lexus LS 600h (XF40) features LED low beam, position and side marker lights in North America, and the 2009 Cadillac Escalade Platinum used LEDs for the low and high beams, as well as for the position and side marker lights. The Mercedes-Benz S-Class (W222) used entirely LED lights, even in the most basic trim level.
Higher efficiency LED versions of all of these lamps are now available. Tubular lamps with electrical contacts at each end are now being used in standalone lamps and household fixtures. These come in various lengths and power ratings (50–300 W). More powerful lamps are used as portable work lights, with bulbs rated 250 or 500 watts.
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