Choose the factory headlight system below to see the correct bulb and recommendation path for this 2003 Audi A4.
Source-listed fitment data supplied by CarBulbGuide. Confirm the installed bulbs and configuration before ordering.
Low beam
H7
High beam
H7
Factory setup
Without Lighting: xenon
Choose the factory system installed in this vehicle. Bulb sizes and recommendations change with that selection.
Best headlight upgrades
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.
Fitment confirmed; product evidence is limited. Factory Xenon replacement bulbs are separate from aftermarket HID conversion kits.
Best headlight upgrades
These products were physically tested by BulbFacts, but the tests were not performed in this exact vehicle unless a card explicitly says otherwise.
Lighting: halogen
Low Beam: H7 · High Beam: H9
Best direct replacement
OSRAM Night Breaker 200
Low Beam H7
Estimated price$20-34
BulbFacts testedCorrect bulb size
Best Standard Reflector Upgrade
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.
The Cool Blue Advance is another color-focused pick, not a maximum-output pick. It makes sense when matching the look of other whiter lighting is more important than measured brightness.
BulbFacts testedCorrect bulb sizeprojector housing only
Best Premium Distance
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.
Best headlight upgrades
These products were physically tested by BulbFacts, but the tests were not performed in this exact vehicle unless a card explicitly says otherwise.
Model: Quattro; Lighting: halogen
Low Beam: H7
Best direct replacement
OSRAM Night Breaker 200
Low Beam H7
Estimated price$20-34
BulbFacts testedCorrect bulb size
Best Standard Reflector Upgrade
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.
BulbFacts testedCorrect bulb sizeprojector housing only
Best Premium Distance
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.
Best headlight upgrades
These products were physically tested by BulbFacts, but the tests were not performed in this exact vehicle unless a card explicitly says otherwise.
Lighting: HID
Low Beam: D1S · High Beam: H7
Factory Xenon replacement
OSRAM Night Breaker 220
Low Beam D1S
Estimated price$150
BulbFacts testedCorrect bulb size
Best Premium Output
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.
Measured vs factory Xenon referenceMeasured test
Low beam+58% light
Reference 408 lux · Upgrade 645 lux
Color4,500K 100K cooler
Reference 4,400K · Upgrade 4,500K · 5000K pure white
The CBI-NG is the styling-friendly premium choice. It still performs well, but the main reason to buy it is the cleaner 5300K tone that gives factory HID headlights a more modern white look.
Measured vs factory Xenon referenceMeasured test
Low beam+25% light
Reference 408 lux · Upgrade 509 lux
Color5,300K 900K cooler
Reference 4,400K · Upgrade 5,300K · 5000K pure white
A matching bulb size identifies fitment; it does not by itself prove optical compatibility or make a conversion a vehicle-specific recommendation.
Best headlight upgrades
These products were physically tested by BulbFacts, but the tests were not performed in this exact vehicle unless a card explicitly says otherwise.
Model: Quattro; Lighting: HID
Low Beam: D1S
Factory Xenon replacement
OSRAM Night Breaker 220
Low Beam D1S
Estimated price$150
BulbFacts testedCorrect bulb size
Best Premium Output
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.
Measured vs factory Xenon referenceMeasured test
Low beam+58% light
Reference 408 lux · Upgrade 645 lux
Color4,500K 100K cooler
Reference 4,400K · Upgrade 4,500K · 5000K pure white
The CBI-NG is the styling-friendly premium choice. It still performs well, but the main reason to buy it is the cleaner 5300K tone that gives factory HID headlights a more modern white look.
Measured vs factory Xenon referenceMeasured test
Low beam+25% light
Reference 408 lux · Upgrade 509 lux
Color5,300K 900K cooler
Reference 4,400K · Upgrade 5,300K · 5000K pure white
A matching bulb size identifies fitment; it does not by itself prove optical compatibility or make a conversion a vehicle-specific recommendation.
Best headlight upgrades
These products were physically tested by BulbFacts, but the tests were not performed in this exact vehicle unless a card explicitly says otherwise.
Model: Quattro
High Beam: H7 · High/Low Beam Combined: H7
Best direct replacement
OSRAM Night Breaker 200
High Beam H7 · High/Low Beam Combined H7
Estimated price$20-34
BulbFacts testedCorrect bulb size
Best Standard Reflector Upgrade
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.
BulbFacts testedCorrect bulb sizeprojector housing only
Best Premium Distance
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.
Other bulbs
Available exterior and interior lighting data for this model year.
Confirm the installed bulb, connector, housing, and factory system before ordering.
Position
Bulb or system
Fitment status
High/Low Beam CombinedWithout Lighting: xenon
H7
Likely fitment
Low BeamLighting: halogen
H7
Bulb size confirmed
High BeamLighting: halogen
H9
Bulb size confirmed
Low BeamModel: Quattro; Lighting: halogen
H7
Likely fitment
Low BeamLighting: HID
D1S
Bulb size confirmed
High BeamLighting: HID
H7
Bulb size confirmed
Low BeamModel: Quattro; Lighting: HID
D1S
Likely fitment
High BeamModel: Quattro
H7
Likely fitment
High/Low Beam CombinedModel: Quattro
H7
Likely fitment
Other Audi A4 years
Each model year opens its own BulbFacts record. Bulb sizes and factory systems are not carried over from adjacent years.
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.
