Mercedes-Benz S55 AMG Headlight Bulb Size

Additional Notes

• The H7 bulb is the most widely used type across the Mercedes-Benz S55 AMG headlight specifications, appearing in both the high beam and low beam positions for all model years from 2001-2006. It is a single-filament halogen bulb operating at 12V and 55W, fitted with a PX26d base, and carries ECE certification with approval also extended to the United States and Japan.
• The high beam headlight position uses exclusively the H7 bulb across all six model years covered in the specifications, with no HID variant listed for that position.
• The low beam headlight position on the Mercedes-Benz S55 AMG accommodates two distinct bulb types depending on the headlamp system installed. Vehicles without HID headlamps use the H7 halogen bulb, while vehicles equipped with HID headlamps use a discharge bulb, either D2S or D2R depending on the model year.
• The D2S and D2R are both HID xenon discharge bulbs operating at 85V and 35W. Despite their identical electrical ratings, they are not interchangeable. The D2S carries a P32d-2 base and is designed for projector-type housings, while the D2R carries a P32d-3 base and is intended for reflector-type housings.
• Both the D2S and D2R require an external ignitor to initiate the high-voltage arc that produces light, unlike the H7 halogen bulb, which operates directly from the vehicle's standard 12V supply without additional ignition components.
• The low beam HID fitment on the S55 AMG changed between model years. The 2001-2002 model years specify the D2R for vehicles with HID headlamps, while the 2003-2006 model years specify the D2S instead, indicating a change in headlamp housing type between those production periods.
• Because the D2S and D2R share the same wattage and voltage ratings but differ in base type and housing compatibility, substituting one for the other is not supported by the specifications and would be inconsistent with the housing design each bulb is engineered to work with.
• All three bulb types listed in the specifications, H7, D2S, and D2R, conform to ECE standards, which govern photometric and safety requirements across European and international markets.