Rolls-Royce Silver Shadow Dome Light Bulb Size

The Rolls-Royce Silver Shadow dome light utilizes bulb size 89 for interior illumination purposes. Available data for the specified component covers the period from 1966 through 1975.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
1966-1975	89

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 13W.	89

Other Locations

Additional Notes

The Rolls-Royce Silver Shadow uses the 89 bulb for its dome light across all listed model years, spanning 1966-1975.
The 89 is an ANSI-standardized bulb type recognized in both the United States and Canada.
It operates on a 12-volt electrical system and draws 13 watts.
The 89 bulb uses a BA15s bayonet base, which is a single-contact bayonet mount with a 15mm collar.
As a single-filament bulb, the 89 serves functions that require only one lighting mode, such as a dome light.
The 89 is a lower-wattage variant of the 1156 bulb, meaning the two share the same BA15s base type but differ in wattage output.
Because the 1156 operates at a higher wattage, it is not a direct drop-in replacement for the 89 in applications where wattage tolerance is a factor.