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A headlight or Headlamp refers to a lamp attached to the front of a vehicle to illuminate the road ahead. Headlamps are also known as headlights, but in the most precise meaning, Headlamp refers to the device itself, while headlight refers to the beam of light produced by the device.

  • The most important lamps for the driver are the headlamps. When headlight switches are turned on, they provide light ahead for the vehicle. 
  • The tungsten filament turns white-hot when connected to the battery and gives out light, The light is reflected forward by the curved reflector, Then the light passes through the lens which arranges it in a pattern to light the road ahead.  The sealed beam headlamp is replaced as a unit or assembly.
  • Many vehicles have halogen headlamps which emit a whiter and brighter light than other sealed beam headlamps.
  • The halogen headlamp has a smaller inner bulb filled with halogen gas which protects the tungsten filament, The outer case is see airtight or sealed hermetically.

Headlamp Switch

The headlamp switch controls the operation of the headlamps and other exterior and interior lights, It connects to the battery directly and is located on the instrument panel to the left of the steering wheel. The headlamp switch usually combines a circuit breaker with a three-position pull switch.

  • It also includes a rotary switch that operates a variable resistor or rheostat