Lighting: halogen

2015 Alfa Romeo 4C Headlight Bulbs & Lighting Guide

Choose the factory headlight system below to see the correct bulb and recommendation path for this 2015 Alfa Romeo 4C.

Source-listed fitment data supplied by CarBulbGuide. Confirm the installed bulbs and configuration before ordering.

Low beam
H9
High beam
H9
Factory setup
Lighting: halogen

Choose the factory system installed in this vehicle. Bulb sizes and recommendations change with that selection.

Representative car or sedan image for 2015 Alfa Romeo 4C
Representative car or sedan image

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

High/Low Beam Combined: H9

OSRAM Cool Blue Advance manufacturer product image
Best direct replacement

OSRAM Cool Blue Advance

High/Low Beam Combined H9

Estimated price$20-34
BulbFacts testedCorrect bulb size
Best HID Color Match

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.

Measured vs stock halogenReflector test
Low beam-27% light
Stock 373 lux · Upgrade 273 lux
High beam-29% light
Stock 876 lux · Upgrade 618 lux
Color4,350K 925K cooler
Stock 3,425K · Upgrade 4,350K · 5000K pure white
General BulbFacts housing test
Read BulbFacts reviewCompare test resultsBuy at Amazon
Morimoto 2Stroke 4.0 manufacturer product image
Best reflector LED upgrade

Morimoto 2Stroke 4.0

High/Low Beam Combined H9

Estimated price$178
BulbFacts testedCorrect bulb sizereflector housing only
Safest Glare + DRL Pick

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.

Measured vs stock halogenReflector test
Low beam+138% light
Stock 373 lux · Upgrade 889 lux
High beam+114% light
Stock 876 lux · Upgrade 1,872 lux
Color5,250K 1,825K cooler
Stock 3,425K · Upgrade 5,250K · 5000K pure white
General BulbFacts reflector test
Read BulbFacts reviewCompare test resultsBuy at BRI Source
Morimoto XB Elite 2.0 manufacturer product image
Best projector HID upgrade

Morimoto XB Elite 2.0

High/Low Beam Combined H9

Estimated price$311
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.

Measured vs stock halogenProjector test
Low beam+95% light
Stock 284 lux · Upgrade 554 lux
High beam+230% light
Stock 935 lux · Upgrade 3,088 lux
Color5,000K 1,575K cooler
Stock 3,425K · Upgrade 5,000K · 5000K pure white
General BulbFacts projector test
Read BulbFacts reviewCompare test resultsBuy at BRI Source

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.

Cargo / Trunk Light
2825Verify installed bulb
Dome Light
6411Verify installed bulb
Front Side Marker
2821Verify installed bulb
License Plate Light
2825Verify installed bulb
Rear Side Marker
2821Verify installed bulb
Reverse Light
921Verify installed bulb
Technical details and sources

Confirm the installed bulb, connector, housing, and factory system before ordering.

PositionBulb or systemFitment status
High/Low Beam CombinedLighting: halogenH9Bulb size confirmed
High/Low Beam CombinedLighting: HIDD5SBulb size confirmed

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.