Headlight Bulb


Headlight Bulb

A headlight bulb is a halogen or HID (high-intensity discharge) bulb that is used to project a high or low beam. While most headlight bulbs are replaceable, there are some older headlights with a sealed beam design. Such sealed lamps can be filled with halogen gas to increase their light output. Regardless of the headlight design, a failing bulb can make the light inoperable and cause discoloration of its lens.


Headlight bulb troubleshooting

  • Most headlight bulbs are easy to replace. However, it can be difficult to reach the bulbs on some vehicles.
  • Both headlight bulbs should be replaced at the same time.
  • Some headlights come with just one bulb for the low and high beams, while others can be equipped with separate bulbs.
  • The headlights should be properly aimed. Make sure to check the adjustment after replacing the bulbs.
  • If you have headlights with separate low-beam and high-beam bulbs, the first one should be located outward or above the high-beam counterpart.
  • Depending on the headlights, they can come with halogen or HID (high-intensity discharge) or xenon bulbs. The latter ones are usually very expensive.
  • Failures of the high-beam switch can affect headlight operation.
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