Better Bulbs for ATSes. Our Review of Headlamp Bulb Upgrades for Compact Cadillacs by Hib Halverson, Editor, V-Net Product Evaluation Pages All Cadillac ATS headlamps have only one bulb. If the car was ordered with the “Luxury Package” they have D3S HID bulbs. Cars without Luxury Packages have conventional, 9012 quartz-halogen bulbs. In either case, the change from low- to ...

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