Mercedes-Benz C350 Headlight Bulb Size

Additional Notes

• The H7 is a single-filament halogen bulb operating at 12V and 55W, fitted with a PX26d base. It serves as the high beam headlight bulb across all listed model years of the Mercedes-Benz C350 (2006-2015) and also as the standard low beam option throughout the same range.
• The D1S and D2S are both HID (xenon) discharge bulbs rated at 85V and 35W, making them significantly higher in operating voltage than the H7 halogen type, despite drawing less wattage.
• The D1S uses a PK32d-2 base and incorporates an integral ignitor within the bulb itself, whereas the D2S uses a P32d-2 base and depends on an external ignitor housed separately in the vehicle's lighting system.
• Both HID types are designated for projector-type headlamp housings, meaning they are not interchangeable with reflector-type housings designed for halogen bulbs.
• For the Mercedes-Benz C350, the low beam position on 2008-2015 model years accepts either an H7 or a D1S, depending on whether the vehicle was equipped with HID headlamps at the time of manufacture.
• The 2006-2007 model years differ from later years in that their HID low beam option uses the D2S rather than the D1S, which requires attention when sourcing a replacement due to the differing base types and ignitor configurations.
• Because the H7 and D1S or D2S occupy the same low beam position on vehicles with different headlamp configurations, the installed headlamp housing type determines which bulb applies, and the two halogen and HID types are not substitutable for one another.
• All three bulb types conform to ECE standards and carry approval for use in Europe and worldwide, with the H7 additionally holding approval in the United States and Japan.