Choose the factory headlight system below to see the correct bulb and recommendation path for this 2017 Audi A4.
Low beam
Factory halogen system
High beam
H11
Factory setup
Factory setup not specified in fitment source
6.7/10BulbFacts OE Visibility Score
Factory performanceWeak Factory Lighting
Choose the factory system installed in this vehicle. Bulb sizes and recommendations change with that selection.
How the factory headlights perform
This vehicle has more than one documented factory system. Use the selector above to match the trim or package where available.
Weak Factory Lighting
Usually leave stock if this factory system is installed; confirm the exact trim/package.
Peak low-beam reach
238 ft
Compared with tested Cars, Sedans & Hatchbacks12th percentile
Compared with all tested vehicles9th percentile
Peak high-beam reach
519 ft
Compared with tested Cars, Sedans & Hatchbacks64th percentile
Compared with all tested vehicles62nd percentile
Curve visibility
10.2 / 15
Glare control
10 / 10No recorded low-beam glare exceedance
High-beam assist
Yes
Curve-adaptive lighting
No
Performance varies by factory headlight system or trim. Confirm the installed configuration above.
Weak Factory Lighting
Factory LED systems are usually not simple bulb swaps; confirm the trim and full headlight assembly options before considering changes.
Peak low-beam reach
238 ft
Compared with tested Cars, Sedans & Hatchbacks12th percentile
Compared with all tested vehicles9th percentile
Peak high-beam reach
519 ft
Compared with tested Cars, Sedans & Hatchbacks64th percentile
Compared with all tested vehicles62nd percentile
Curve visibility
10.2 / 15
Glare control
10 / 10No recorded low-beam glare exceedance
High-beam assist
No
Curve-adaptive lighting
No
Performance varies by factory headlight system or trim. Confirm the installed configuration above.
Weak Factory Lighting
Upgrade recommended if night driving is a priority; compare tested BulbFacts options before buying.
Peak low-beam reach
396 ft
Compared with tested Cars, Sedans & Hatchbacks91st percentile
Compared with all tested vehicles91st percentile
Peak high-beam reach
469 ft
Compared with tested Cars, Sedans & Hatchbacks24th percentile
Compared with all tested vehicles24th percentile
Curve visibility
8.9 / 15
Glare control
0 / 10Recorded low-beam glare exceedance up to 75.4%
High-beam assist
No
Curve-adaptive lighting
No
Performance varies by factory headlight system or trim. Confirm the installed configuration above.
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.
Factory setup not specified in fitment source
High Beam: H11
Best direct replacement
OSRAM Night Breaker 200
High Beam H11
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
High/Low Beam Combined: D5S
Factory Xenon replacement
DDM Tuning Ultra Xenon
High/Low Beam Combined D5S
Estimated price$50
BulbFacts testedCorrect bulb size
Best Value
The DDM Ultra Xenon is the value pick because the 5500K version delivers strong low-beam performance at a much lower price than the major premium brands.
Measured vs factory Xenon referenceMeasured test
Low beam+43% light
Reference 408 lux · Upgrade 583 lux
High beam+2% light
Reference 807 lux · Upgrade 824 lux
Color5,500K 1,100K cooler
Reference 4,400K · Upgrade 5,500K · 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: allroad; Lighting: HID
High/Low Beam Combined: D5S
Factory Xenon replacement
DDM Tuning Ultra Xenon
High/Low Beam Combined D5S
Estimated price$50
BulbFacts testedCorrect bulb size
Best Value
The DDM Ultra Xenon is the value pick because the 5500K version delivers strong low-beam performance at a much lower price than the major premium brands.
Measured vs factory Xenon referenceMeasured test
Low beam+43% light
Reference 408 lux · Upgrade 583 lux
High beam+2% light
Reference 807 lux · Upgrade 824 lux
Color5,500K 1,100K cooler
Reference 4,400K · Upgrade 5,500K · 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: allroad
High Beam: H11
Best direct replacement
OSRAM Night Breaker 200
High Beam H11
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.
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 DDM Ultra Xenon is the value pick because the 5500K version delivers strong low-beam performance at a much lower price than the major premium brands.
Measured vs factory Xenon referenceMeasured test
Low beam+43% light
Reference 408 lux · Upgrade 583 lux
High beam+2% light
Reference 807 lux · Upgrade 824 lux
Color5,500K 1,100K cooler
Reference 4,400K · Upgrade 5,500K · 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.
Other bulbs
Available exterior and interior lighting data for this model year.
Brake Light
1156Possible fitment — verify installed bulb
Cornering Light
H11Possible fitment — verify installed bulb
Fog Light
T15Possible fitment — verify installed bulb
Tail Light
T15Possible fitment — verify installed bulb
Turn Signal (Unqualified)
BAU15SPossible fitment — verify installed bulb
Front Turn Signal
PW24WLikely fitment
Brake Light
T15Likely fitment
Technical details and sources
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 BeamFactory setup not specified in fitment source
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.
