Bulb size needs confirmation. Choose or verify the installed factory headlight system before using a bulb size or product 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
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
Confirm the installed bulb, connector, housing, and factory system before ordering.
Position
Bulb or system
Fitment status
High BeamFactory system not specified
9005XS
Possible fitment — verify installed bulb
Low BeamLighting: halogen
9006XS
Likely fitment
Low BeamLighting: HID
D1S
Likely fitment
Other Cadillac CTS 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.
