Mercedes-Benz SL500 Headlight Bulb Size

Additional Notes

• The H7 bulb follows the ECE standard and is recognized across Europe, the US, and Japan. It is a single-filament halogen type with a PX26d base, rated at 12V and 55W. In the Mercedes-Benz SL500, it serves both high beam and low beam positions for the 2003-2006 model years.
• The 9004 bulb follows the ANSI standard, primarily used in the US and Canada. Unlike the H7 and H1, it houses dual filaments within a single bulb, handling both high and low beam functions from one unit. Its P29t base and 65W/45W rating distinguish it from the single-filament ECE types. It appears across the 1994-2002 model years in halogen capsule headlamp configurations.
• The H1 is a single-filament halogen bulb with a P14.5s base, rated at 12V and 55W under the ECE standard. In the SL500, it is listed exclusively for the high beam position in vehicles equipped with HID headlamps, covering the 1995-2002 model years. Its role alongside a separate HID low beam reflects a mixed-technology headlamp system.
• The D2S is a high-intensity discharge bulb rated at 85V and 35W, designed specifically for projector-type housings. It requires an external ignitor to initiate the arc discharge, which sets it apart from all halogen types in these specifications. It is used for the low beam position in HID-equipped SL500 vehicles from 1996-2006.
• The 2003-2006 SL500 with HID headlamps uses a split-technology arrangement: the H7 handles the high beam while the D2S handles the low beam. These two bulbs are not interchangeable with each other, as they differ in base type, operating voltage, and ignition requirements.
• For the 1996-2002 SL500 with HID headlamps, the low beam uses the D2S while the high beam uses the H1. Both are ECE-standard bulbs, but they operate on fundamentally different technologies and cannot substitute for one another.
• The 9004 and H7 are not interchangeable despite both being 12V halogen types. The 9004 uses a P29t base and a dual-filament design under the ANSI standard, while the H7 uses a PX26d base with a single filament under the ECE standard. This base incompatibility means the two types require different housings.
• The 1995 SL500 is the only model year in these specifications where the high beam position lists both a 9004 and an H1 under a xenon headlight designation, without the halogen capsule qualifier used in later years. The 1994 model year lists only the 9004 for both beam positions, with no HID or xenon variant noted.