quick headlight ????
Here's a general overview:
HMost headlights use incandescent bulbs (usually halogen), either with separate high and low beam bulbs, or a single bulb on each side with dual filaments. More and more are using high-intensity discharge (HID) lamps, similar to the Mercury-vapor lamps used in white street lights. These have a distinct purplish or bluish cast to them, which also causes fluorescence in certain materials. HID bulbs are also extremely energy-efficient, using over 80% less power, and drawing less electrical current from the alternator and improving fuel efficiency.
Traditionally, headlamps have consisted of a light source (filament) placed at or near the focus of a parabolic reflector, with an optically-faceted glass or polycarbonate lens to direct and distribute the light per the beam specifications. Computerized optical development tools have allowed the creation of non parabolic complex-shape reflectors, either with optically-faceted or completely clear lenses.
HID headlights use a special miniaturized type of metal halide lamp and produce more light than ordinary incandescent light bulbs (including quartz halogen lamps). HID refers to high-intensity discharge; the technical term for the electric arc that produces the light. The light from HID headlights has a distinct bluish tint when compared with normal headlights. The high intensity of the arc comes from metallic salts that are vaporized within the arc chamber. Automotive HID lamps are commonly called Xenon headlights because of the Xenon gas used in the lamps. Ordinary metal halide lamps such as the ones used for street lights or commercial lighting use argon instead of xenon gas. The Xenon gas allows the lamps to produce minimally adequate amounts of light upon startup, and speed the warmup time. If argon were used instead, it would take several minutes for the lamps to reach their full output.
HID headlamp bulbs produce between 2,800 and 3,000 lumens from 42 watts of electrical power, while halogen filament headlamp bulbs produce between 700 and 2,100 lumens from between 40 and 65 watts. Because of the increased amounts of light available from HID 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 Xenon headlamp can produce a more robust beam pattern.
HID headlights require ballasts to operate their lamps. The ballast convert the 12 volts used in automotive electrical systems to the several thousand volts required to strike and maintain the arc.
Despite marketing claims to the contrary, HID headlamps' light output is not similar to daylight. The spectral power distribution (SPD) of an automotive HID headlamp is discontinuous, while the SPD of a filament lamp, like that of the sun, is a continuous curve.
The arc within an HID headlamp bulb generates considerable short-wave ultraviolet (UV) light, but none of it escapes the bulb. A UV-absorbing hard glass shield is incorporated around the bulb's arc tube. This is important to prevent degradation of UV-sensitive components and materials in headlamps, such as polycarbonate lenses and reflector hardcoats. The lamps do emit considerable near-UV light).
The arc light source in an HID headlamp is fundamentally different from the filament light source used in tungsten/halogen headlamps. For that reason, HID-specific optics are used to collect and distribute the light. Installing HID bulbs in headlamps designed to take filament bulbs results in improperly-focused beam patterns and excessive glare, and is therefore illegal in almost all countries.
You can also check here for more specifics:
http://forums.maxima.org/showthread....88#post3645488
And here:
http://forums.maxima.org/showthread....&highlight=hid
HMost headlights use incandescent bulbs (usually halogen), either with separate high and low beam bulbs, or a single bulb on each side with dual filaments. More and more are using high-intensity discharge (HID) lamps, similar to the Mercury-vapor lamps used in white street lights. These have a distinct purplish or bluish cast to them, which also causes fluorescence in certain materials. HID bulbs are also extremely energy-efficient, using over 80% less power, and drawing less electrical current from the alternator and improving fuel efficiency.
Traditionally, headlamps have consisted of a light source (filament) placed at or near the focus of a parabolic reflector, with an optically-faceted glass or polycarbonate lens to direct and distribute the light per the beam specifications. Computerized optical development tools have allowed the creation of non parabolic complex-shape reflectors, either with optically-faceted or completely clear lenses.
HID headlights use a special miniaturized type of metal halide lamp and produce more light than ordinary incandescent light bulbs (including quartz halogen lamps). HID refers to high-intensity discharge; the technical term for the electric arc that produces the light. The light from HID headlights has a distinct bluish tint when compared with normal headlights. The high intensity of the arc comes from metallic salts that are vaporized within the arc chamber. Automotive HID lamps are commonly called Xenon headlights because of the Xenon gas used in the lamps. Ordinary metal halide lamps such as the ones used for street lights or commercial lighting use argon instead of xenon gas. The Xenon gas allows the lamps to produce minimally adequate amounts of light upon startup, and speed the warmup time. If argon were used instead, it would take several minutes for the lamps to reach their full output.
HID headlamp bulbs produce between 2,800 and 3,000 lumens from 42 watts of electrical power, while halogen filament headlamp bulbs produce between 700 and 2,100 lumens from between 40 and 65 watts. Because of the increased amounts of light available from HID 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 Xenon headlamp can produce a more robust beam pattern.
HID headlights require ballasts to operate their lamps. The ballast convert the 12 volts used in automotive electrical systems to the several thousand volts required to strike and maintain the arc.
Despite marketing claims to the contrary, HID headlamps' light output is not similar to daylight. The spectral power distribution (SPD) of an automotive HID headlamp is discontinuous, while the SPD of a filament lamp, like that of the sun, is a continuous curve.
The arc within an HID headlamp bulb generates considerable short-wave ultraviolet (UV) light, but none of it escapes the bulb. A UV-absorbing hard glass shield is incorporated around the bulb's arc tube. This is important to prevent degradation of UV-sensitive components and materials in headlamps, such as polycarbonate lenses and reflector hardcoats. The lamps do emit considerable near-UV light).
The arc light source in an HID headlamp is fundamentally different from the filament light source used in tungsten/halogen headlamps. For that reason, HID-specific optics are used to collect and distribute the light. Installing HID bulbs in headlamps designed to take filament bulbs results in improperly-focused beam patterns and excessive glare, and is therefore illegal in almost all countries.
You can also check here for more specifics:
http://forums.maxima.org/showthread....88#post3645488
And here:
http://forums.maxima.org/showthread....&highlight=hid
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