Choose the factory headlight system below to see the correct bulb and recommendation path for this 2003 Audi A4.
Choose the factory system installed in this vehicle. Bulb sizes and recommendations change with that selection.
BulbFacts has a supported bulb-size record, but does not currently have enough applicable product evidence to show a responsible recommendation for this headlight system.
High/Low Beam Combined: H7
Fitment confirmed; product evidence is limited. Factory Xenon replacement bulbs are separate from aftermarket HID conversion kits.
These products were physically tested by BulbFacts, but the tests were not performed in this exact vehicle unless a card explicitly says otherwise.
Low Beam: H7
Low Beam H7
The Night Breaker 200 is the top standard-wattage reflector recommendation at the time of review. Anything scoring higher in the reflector chart uses much higher wattage, while the NB200 keeps the simple drop-in halogen format.
Low Beam H7
The glare-control recommendation for reflector housings, and also the easiest pick when your vehicle needs an LED that can properly dim for DRL use.
Low Beam H7
The Morimoto XB Elite remains the premium performance benchmark from the current HID recommendations. It tested as one of the strongest 35W projector-focused HID kits and is the better fit when you want a complete, higher-quality conversion kit instead of a generic marketplace option.
A matching bulb size identifies fitment; it does not by itself prove optical compatibility or make a conversion a vehicle-specific recommendation. Use the LED upgrade path only with a reflector housing and confirm beam pattern and glare after installation. Use the HID upgrade path only with a projector housing; it is not a reflector-housing recommendation.
These products were physically tested by BulbFacts, but the tests were not performed in this exact vehicle unless a card explicitly says otherwise.
Low Beam: D1S
Low Beam D1S
The Night Breaker 220 is the premium pick when performance matters more than chasing the whitest possible color. It improves low and high beam output while keeping a warmer, weather-friendly stock-style tone.
A matching bulb size identifies fitment; it does not by itself prove optical compatibility or make a conversion a vehicle-specific recommendation.
These products were physically tested by BulbFacts, but the tests were not performed in this exact vehicle unless a card explicitly says otherwise.
High Beam: H7 · High/Low Beam Combined: H7
High Beam H7 · High/Low Beam Combined H7
The Night Breaker 200 is the top standard-wattage reflector recommendation at the time of review. Anything scoring higher in the reflector chart uses much higher wattage, while the NB200 keeps the simple drop-in halogen format.
High Beam H7 · High/Low Beam Combined H7
The glare-control recommendation for reflector housings, and also the easiest pick when your vehicle needs an LED that can properly dim for DRL use.
High Beam H7 · High/Low Beam Combined H7
The Morimoto XB Elite remains the premium performance benchmark from the current HID recommendations. It tested as one of the strongest 35W projector-focused HID kits and is the better fit when you want a complete, higher-quality conversion kit instead of a generic marketplace option.
A matching bulb size identifies fitment; it does not by itself prove optical compatibility or make a conversion a vehicle-specific recommendation. Use the LED upgrade path only with a reflector housing and confirm beam pattern and glare after installation. Use the HID upgrade path only with a projector housing; it is not a reflector-housing recommendation.
Available exterior and interior lighting data for this model year.
Fitment, factory-system research, and BulbFacts product tests remain separate evidence. A matching bulb size does not by itself make a conversion a vehicle-specific recommendation.
| Position | Bulb or system | Evidence status |
|---|---|---|
| High/Low Beam CombinedWithout Lighting: xenon | H7 | Likely fitment |
| Low BeamModel: Quattro; Lighting: halogen | H7 | Likely fitment |
| Low BeamModel: Quattro; Lighting: HID | D1S | Likely fitment |
| High BeamModel: Quattro | H7 | Likely fitment |
| High/Low Beam CombinedModel: Quattro | H7 | Likely fitment |
Fitment note: Verify the installed bulb, connector, housing, and factory system before ordering. A bulb-size match is not automatically a conversion recommendation or proof of vehicle-specific testing.
