Body Style: coupe; Lighting: HID

2015 Cadillac CTS Headlight Bulbs & Lighting Guide

Choose the factory headlight system below to see the correct bulb and recommendation path for this 2015 Cadillac CTS.

Low beam
D1S
High beam
D1S
Factory setup
Body Style: coupe; Lighting: HID

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

2015 Cadillac CTS representative vehicle 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.

Body Style: coupe; Lighting: HID

High/Low Beam Combined: D1S

Factory Xenon replacement

OSRAM Night Breaker 220

High/Low Beam Combined D1S

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.

General BulbFacts housing 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.

Support independent testing: BulbFacts may earn a commission from qualifying purchases through these links, at no extra cost to you. Affiliate relationships do not determine test results or recommendations.

Other bulbs

Available exterior and interior lighting data for this model year.

Cargo / Trunk Light
211-2Likely fitment
Dome Light
T10Likely fitment
Door Light
T15Likely fitment
Daytime Running Light
5202Likely fitment
Fog Light
H11Likely fitment
Front Side Marker
T10Likely fitment
Front Turn Signal
HPC24NALikely fitment
Glove Box Light
T15Likely fitment
License Plate Light
T10Likely fitment
Map Light
T10Likely fitment
Stepwell Light
T10Likely fitment
Reverse 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.

PositionBulb or systemEvidence status
High/Low Beam CombinedBody Style: coupe; Lighting: HIDD1SLikely fitment
High/Low Beam CombinedBody Style: sedan; Lighting: HIDD3SLikely fitment

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.