Mercedes-Benz S500 Headlight Bulb Size

Additional Notes

• The H7 bulb is the most frequently specified type across the Mercedes-Benz S500 headlight data, appearing in both high beam and low beam positions across the 2000-2006 model years, as well as in low beam applications for 1998 and 1999 models equipped with halogen capsule headlamps. It is a single-filament halogen bulb rated at 12V and 55W, built to ECE standards with a PX26d base, and is also approved for use in the US and Japan.
• The H1 bulb is specified for the high beam position on the 1998-1999 S500. Like the H7, it is a single-filament halogen bulb rated at 12V and 55W with ECE approval, though it uses a P14.5s base rather than the PX26d base of the H7, making the two types physically incompatible with each other despite sharing the same wattage and voltage ratings.
• The 9003 bulb is specified for both the high beam and low beam positions on the 1994 S500. It differs from the H7 and H1 types in that it is a dual-filament halogen bulb, handling both beam functions within a single unit. Built to ANSI standards for the US and Canadian market, it operates at 12V with a 60W filament for high beam and a 55W filament for low beam, using a P43t base.
• Two distinct HID bulb types appear in the low beam specifications: D2R and D2S. Both operate at 85V and 35W and require an external ignitor to function, distinguishing them fundamentally from the halogen types in the same specifications. The D2R uses a P32d-3 base and is designed for reflector-type housings, while the D2S uses a P32d-2 base and is intended for projector-type housings. These two types are not interchangeable despite their similar electrical ratings.
• For the 2003-2006 model years, the low beam position on the Mercedes-Benz S500 is specified with either an H7 or a D2S bulb depending on the headlamp system fitted to the vehicle. The D2S application is explicitly noted as being for HID headlamps, indicating that the two bulb types correspond to different factory headlamp configurations rather than representing alternative replacements for the same housing.
• For the 2000-2002 model years, the low beam HID option shifts from D2S to D2R. This reflects a change in headlamp housing design between those years and the 2003-2006 range, as the D2R is specific to reflector-type housings while the D2S suits projector-type housings. Using the incorrect HID type for a given housing would result in improper light distribution.
• The 1998-1999 model years present a three-way split in low beam bulb types across the S500 range: H7 for halogen capsule headlamp configurations, D2R for HID configurations, and, in the case of 1999, the high beam uses H1 rather than H7. This means that 1998 and 1999 vehicles require careful identification of both the headlamp system type and the specific beam position before a replacement bulb type can be determined.
• The H7 and H1 bulbs share identical voltage and wattage ratings but use different base types, P14.5s for H1 and PX26d for H7, which prevents cross-substitution. Similarly, the D2R and D2S share electrical characteristics but have different base configurations, P32d-3 and P32d-2 respectively, and are matched to different optical housing designs. In all cases across these specifications, physical base compatibility and housing type are the determining factors for correct fitment.