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Additional headlights car parts - all important information about operating method, mounting, diagnostics and service life

The lighting system includes lights, lamps, bulbs, and their components. They illuminate the area in front of the car and the inside of the cabin at night time or in bad weather, and act as warnings and signals, for instance by indicating the size of the vehicle to other drivers or warning them about the intention to make a turn or switch lanes.

Design of a lighting system

The main lighting elements are:

  • Lights (lamps). These consist of a housing, a reflector, and a diffuser. There are also sockets for securing and powering light sources, namely bulbs. Some types of products have a special screen to form a light beam and a lens to ensure its diffusion. The sockets are connected to the contacts, which are used to power a bulb. There are caps in the rear part of the lamp housing that ensure access to the internal components of the lamp. Gaskets are installed to seal the joint between the headlamps and the body. Some headlamps have a solid design. They are replaced together with light sources. Interior lights don’t have any reflectors.
  • Switches. These are used to switch on the corresponding light fixture and to allow the selection of its operation mode.
  • Limit switches. Perform the same function as the switches, with the only difference that the devices are switched on automatically after certain conditions are met. These switches are mounted on the brake pedal and gear lever to ensure the automatic activation of the brake and reverse lights respectively.
  • Electrical wiring. This is used to supply voltage from the on-board network to the lighting sources.
  • Relays. These are an important element of the electrical circuit. They are responsible for the voltage supply to certain parts of the equipment.
  • Fuses. These protect the circuit and electrical equipment from voltage spikes.
  • Adjusters. They can be manual or automatic. They adjust the direction and the areas lit by the headlights taking into account the vehicle load.

Maintenance tips

  • Use only those kinds of bulbs recommended by the car manufacturer. Components that are too powerful will destroy the internal parts of the lamp.
  • Make sure that all connectors are securely attached and that the bulb fits tightly into the bulb socket. Unreliable contact can lead to the components burning out.
  • Do not clean lamps with a dry cloth. They are easy to scratch. Always remove dirt with a lint-free cloth soaked with water and car shampoo.
  • Occasionally tighten the fastenings to reduce the effects of vibration.
  • If you drive off-road frequently, apply a special protective film on the headlights and light diffusers.
  • Adjust the headlamps after the installation of tyres or wheels of a different diameter. The headlamps have special adjustment screws for this purpose.
  • Polish the headlamps from time to time to make the diffuser clear again. It is better to have this done at a garage.

Malfunction symptoms

An obvious sign of a malfunctioning lighting system is the lack of response of the corresponding device to being switched on. If only one lamp doesn’t work, the lamp itself is likely to be the problem. If several lamps simultaneously do not work, you should check the switch or the fuse. Flickering lamps and flashes when running over an obstacle indicate poor contacts in the socket or insecurely fixed connectors. Fogged up lamps may indicate that their vents are clogged or they are no longer watertight. Dim light is often a sign that the reflector is flaking or there are scratches and chafing on the diffuser.

Malfunction causes

Malfunctions of the electrical system, such as burnt out socket contacts and a defective relay or fuse, are usually associated with unstable voltages in the electrical circuit. However, a voltage spike can in turn be caused by a faulty alternator or an attempt to start the car using a battery of another vehicle with its engine running. Many breakdowns occur due to strong impacts caused by collisions.

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You can always buy lighting elements at a bargain price in our online store. We run promotions regularly. To find out more about them, please contact our customer service.

Top 10 of best sellers from the Lighting section
Recommended spare parts from the Extra lights section. These are the sales hits. Buy our best sellling items or discover a vast selection of other attractive offers.
Bulb, spotlight 66140 buy 24/7!
OSRAM Bulb, spotlight
Article number: 66140
£ 49,47
incl. 20% VAT, excl. delivery costs,
  • Bulb Type: D1S (gas discharge tube)
  • Rated Power [W]: 35
  • Voltage [V]: 85
  • Socket Type: PK32d-2
  • Product line: XENARC ORIGINAL
  • OSRAMBulb, spotlight
  • Item number66140
  • Manufacturer's suggested retail price£ 66,85
  • Our price £ 49,47
  • Condition  New
Indicator 6601-02 buy 24/7!
ULO Indicator
Article number: 6601-02
£ 36,00
incl. 20% VAT, excl. delivery costs,
  • Fitting Position: Right, Front
  • Supplementary Article / Supplementary Info: with lamp base
  • Indicator Colour: Yellow
  • Quality: OEM, ORIGINAL
  • Registration Type: E-type checked
  • Weight [kg]: 0,200
  • Indicator colour lens: Crystal clear
  • Light Design: Bulb Technology
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  • Item number6601-02
  • Manufacturer's suggested retail price£ 48,65
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  • Condition  New
Bulb, spotlight 66140CBI buy 24/7!
OSRAM Bulb, spotlight
Article number: 66140CBI
£ 63,94
incl. 20% VAT, excl. delivery costs,
  • Bulb Type: D1S (gas discharge tube)
  • Rated Power [W]: 35
  • Voltage [V]: 85
  • Socket Type: PK32d-2
  • Self-service suited packaging see parts list
  • OSRAMBulb, spotlight
  • Item number66140CBI
  • Manufacturer's suggested retail price£ 86,41
  • Our price £ 63,94
  • Condition  New
Ballast, gas discharge lamp 5DV 009 720-001 buy 24/7!
HELLA Ballast, gas discharge lamp
Article number: 5DV 009 720-001
£ 116,32
incl. 20% VAT, excl. delivery costs,
  • Supplementary Article / Info 2: Control Unit/Software must NOT be trained/updated
  • Light Design: Xenon
  • Rated Voltage [V]: 12
  • HELLABallast, gas discharge lamp
  • Item number5DV 009 720-001
  • Manufacturer's suggested retail price£ 157,19
  • Our price £ 116,32
  • Condition  New
Bulb, spotlight 66440 buy 24/7!
OSRAM Bulb, spotlight
Article number: 66440
£ 37,95
incl. 20% VAT, excl. delivery costs,
  • Bulb Type: D4S (Gas Discharge Lamp)
  • Rated Power [W]: 35
  • Voltage [V]: 42
  • Socket Type: P32d-5
  • Product line: XENARC ORIGINAL
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  • Item number66440
  • Manufacturer's suggested retail price£ 51,28
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  • Condition  New
Combination Rearlight 2VA 007 502-061 buy 24/7!
HELLA Combination Rearlight
Article number: 2VA 007 502-061
£ 40,53
incl. 20% VAT, excl. delivery costs,
  • Mounting Type: Fitting
  • Fitting Position: Right
  • Supplementary Article / Info 2: for trailer, with bulbs
  • Inspection Tag: E17 9604, ECE
  • Rated Voltage [V]: 12
  • Number of light functions: 6
  • Fastening Type: for horizontal fastening
  • Bulb Type: P21/5W, P21W, PY21W
  • Light Function: with indicator, with stop light, with rear fog light, with reflector, with taillight, with side marker light
  • HELLACombination Rearlight
  • Item number2VA 007 502-061
  • Manufacturer's suggested retail price£ 40,53
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Bulb, spotlight 64211 buy 24/7!
OSRAM Bulb, spotlight
Article number: 64211
£ 9,12
incl. 20% VAT, excl. delivery costs,
  • Bulb Type: H11
  • Rated Power [W]: 55
  • Voltage [V]: 12
  • Socket Type: PGJ19-2
  • Product line: ORIGINAL
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  • Item number64211
  • Manufacturer's suggested retail price£ 12,33
  • Our price £ 9,12
  • Condition  New
Bulb 12061CP buy 24/7!
Article number: 12061CP
£ 0,95
incl. 20% VAT, excl. delivery costs,
  • Bulb Type: W2,3W
  • Voltage [V]: 12
  • Rated Power [W]: 2,3
  • Socket Type: W2x4,6d
  • Packing Type: Box
  • Item number12061CP
  • Manufacturer's suggested retail price£ 1,29
  • Our price £ 0,95
  • Condition  New
Bulb, indicator 64132 buy 24/7!
OSRAM Bulb, indicator
Article number: 64132
£ 3,66
incl. 20% VAT, excl. delivery costs,
  • Bulb Type: H6W
  • Voltage [V]: 12
  • Rated Power [W]: 6
  • Socket Type: BAX9s
  • Product line: ORIGINAL
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Bulb, spotlight 9012LLC1 buy 24/7!
PHILIPS Bulb, spotlight
Article number: 9012LLC1
£ 23,07
incl. 20% VAT, excl. delivery costs,
  • Bulb Type: HIR2
  • Rated Power [W]: 55
  • Voltage [V]: 12
  • Socket Type: PX22d
  • Packing Type: Box
  • Product line: LongLife
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  • Item number9012LLC1
  • Manufacturer's suggested retail price£ 31,17
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