Some Known Factors About Headlight Types.

The lighting system of a motor vehicle consists of lighting and signaling devices mounted or integrated to various parts of a motor vehicle. These may include the front, sides, rear and, in some cases, the top of the vehicle.
For Example: Head Light, Fog Light, Tail Light, Side Marker Light, Parking Light​

• It provides illumination for the driver of a vehicle to drive
  safely in dark.
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• Secondly, automobile lights enhance the visibility of an automobile.
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• Thirdly, automobile lights act as the warning signals.They showcase information about the presence, position, size, speed and direction of an automotive.​

Head Light:

A headlamp is a light that attached to the front part of a vehicle to light the road ahead. While the common term for the head lamp is headlight used interchangeably in informal discussion. Headlamp is the term for the device itself, while headlight properly refers to the beam of light produced and distributed by the light fitted inside it.

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[FONT=Calibri Light, serif]Types of Head Light:[/FONT]

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• Sealed Beam -Used between 1939 – 1975
  
  
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• Halogen-he most common headlight bulb; uses a filament like a regular household light bulb;filled with halogen gas, which increases the intensity of the light produced Composite – fixed housing with replaceable bulb
  
  
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• High Intensity Discharge (HID) -Also known as HID bulbs; can last up to 90 percent longer than halogen bulbs and produce almost twice the amount of light compared to a halogen bulb; vehicle owners should check to see if their vehicle can handle HID bulbs without alterations to the vehicle wiring​

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Operation:

HID headlamp bulbs do not run on low-voltage DC current, so they require a ballast with either an internal or external ignitor. The ignitor is integrated into the bulb in D1 and D3 systems, and is either a separate unit or part of the ballast in D2 and D4 systems. The ballast controls the current to the bulb. The ignition and ballast operation proceeds in three stages:

1. Ignition: a high voltage pulse is used to produce a spark –in a manner similar to a spark plug –which ionizes the Xenon gas, creating a conducting tunnel between the tungsten electrodes. Electrical resistance is reduced within the tunnel, and current flows between the electrodes.
2. Initial phase: the bulb is driven with controlled overload. Because the arc is operated at high power, the temperature in the capsule rises quickly. The metallic salts vaporizes, and the arc is intensified and made spectrally more complete. The resistance between the electrodes also falls; the electronic ballast control gear registers this and automatically switches to continuous operation.
3. Continuous operation: all metal salts are in the vapor phase, the arc has attained its stable shape, and the luminous efficacy has attained its nominal value. The ballast now supplies stable electrical power so the arc will not flicker. Stable operating voltage is 85 volts AC in D1 and D2 systems, 42 volts AC in D3 and D4 systems. The frequency of the square-wave alternating current is typically 400 hertz or higher.

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