Land Rover Range Rover Map Light Bulb Size

Additional Notes

• The Land Rover Range Rover map light uses two distinct bulb types across its model years: the 12961 and the 3893, each with different base types and filament configurations.
• The 12961 is a Philips part number designating a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12V and 5W. The T10 form factor is a small, single-filament wedge type commonly found in interior lighting applications.
• The 3893 follows the ANSI standard used in the United States and Canada. It features a BAY15d bayonet base and a dual-filament configuration, operating at 12V. The BAY15d base is an offset-pin bayonet mount, which prevents incorrect installation by ensuring only one rotational orientation fits the socket.
• Because the 12961 uses a wedge base and the 3893 uses a bayonet base, the two bulb types are not interchangeable. The socket design in the vehicle determines which type is physically compatible.
• The Range Rover uses the 12961 bulb for the map light in the 2006-2012 model years.
• The 3893 bulb is specified for the 1997-2000 and 2002-2005 model years.
• The 1996 and 2001 model years each use the 12961 bulb, placing them in alignment with the later 2006-2012 specification rather than the 3893 years that surround them.
• The dual-filament nature of the 3893 is notable in a map light context, as map lights typically require only a single filament. Its designation as a specialty application bulb reflects its use outside the more common automotive lighting roles.