The Rolls-Royce Ghost high beam and low beam headlight bulbs both utilize the D1S size. The replacement chart covers 2010 to 2014 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The D1S is a high-intensity discharge bulb, commonly referred to as a xenon or HID bulb, that produces light by passing an electrical arc through xenon gas rather than heating a filament. It operates at 85 volts and 35 watts.
The D1S bulb features a PK32d-2 base with an ignitor built directly into the bulb body. This integrated ignitor design means the ignitor and bulb are replaced as a single unit rather than separately.
The D1S standard falls under ECE regulation, which governs bulb performance and safety requirements across Europe and many other markets worldwide.
The D1S bulb is specified for use in projector-type headlight housings. This housing type uses a lens and reflector system to focus and shape the light beam, and it is not interchangeable with reflector-type housings without modification.
The Rolls-Royce Ghost uses the D1S bulb for both the high beam and low beam headlight positions across the 2010-2014 model years, meaning both functions are served by the same bulb type.
Because both beam positions share the D1S specification, the Ghost's headlight system relies on the projector housing optics and shutter mechanisms to switch between high and low beam output rather than using separate bulbs for each function.
The D1S designation is distinct from similar HID types such as D2S, D3S, and D4S. These types differ in base configuration and ignitor placement, and they are not cross-compatible despite sharing the same wattage rating.