Choose the factory headlight system below to see the correct bulb and recommendation path for this 2017 Audi A4.
Source-listed fitment data supplied by CarBulbGuide. Confirm the installed bulbs and configuration before ordering.
Low beam
D5S
High beam
D5S
Factory setup
Lighting: HID
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.
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 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
BulbFacts does not currently have a supported primary-headlight bulb size for this configuration, so no product is being recommended.
Premium trim · HID projector
Bulb size needs confirmation. Choose or verify the installed factory headlight system before using a bulb size or product recommendation.
Factory system guidance
Integrated LED headlights are not conventional replaceable-bulb systems. The performance results above describe the selected factory configuration.
Prestige trim equipped with Driver Assistance package · LED projector
Low beam: Integrated LED · High beam: Integrated LED
Keep the factory system
The main headlights use integrated factory LEDs, not conventional replaceable bulbs. Diagnose aim, wiring, modules, moisture, and the assembly before ordering service parts by VIN.
Factory system guidance
Integrated LED headlights are not conventional replaceable-bulb systems. The performance results above describe the selected factory configuration.
Premium Plus trim, Prestige trim · LED projector
Low beam: Integrated LED · High beam: Integrated LED
Keep the factory system
The main headlights use integrated factory LEDs, not conventional replaceable bulbs. Diagnose aim, wiring, modules, moisture, and the assembly before ordering service parts by VIN.
Other bulbs
Available exterior and interior lighting data for this model year.
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.
