Halogen Bulb
A halogen bulb is a filament lamp filled with halogen gas, still used in many headlights.
What is Halogen Bulb?
Common types are H1, H4 and H7. They are cheap and easy to replace. Brighter variants exist within the legal limits. Halogen bulbs gradually lose brightness, so replacing a bulb that still works can improve visibility. Higher-wattage bulbs are not legal and may damage the reflector or wiring.
How it works
A tungsten filament glows white-hot; halogen gas extends its life.
Why it matters for your car
Do not touch the glass with fingers; oils cause hotspots. Replace in pairs for even light.
Other terms
- Airbag Control Module (SRS Module)
- Alternator Diode (Rectifier)
- Battery Charger (Smart Charger)
- Bonnet (Hood)
- Brake Disc Runout
- Carbon Cleaning (Intake Decarbonising)
- Clearing Fault Codes
- Coil Spring
- Electric Brake Booster (Electromechanical Booster)
- Engine Code
- EV Purchase Incentives
- Infotainment Head Unit
- Matching Numbers
- Microfibre Towel
- Oil Pressure Warning Light
- Paint Oxidation (Faded Paint)
- Spaceframe Chassis
- Two-Post Lift (Vehicle Lift)
- Unsprung Weight
- Weight Distribution