Jaguar XJ License Plate Bulb Size

Additional Notes

• The Jaguar XJ uses the 12961 bulb for license plate lighting across the 2010-2019 model years, making it the dominant bulb type in these specifications.
• The 12961 is a Philips part number designating a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12 volts and 5 watts.
• The T10 designation refers to the bulb's tubular form factor, measured in eighths of an inch, while the W2.1x9.5d base describes the wedge-style contact configuration used for tool-free installation in most wedge sockets.
• The 1895 bulb is an ANSI-standardized type recognized across the United States and Canada, used in the Jaguar XJ for the 1969-1971 model years.
• The 1895 is a T5 miniature wedge bulb rated at 12 volts and 0.9 watts, drawing significantly less power than the 12961 used in later model years.
• The T5 form factor of the 1895 is physically smaller than the T10 of the 12961, and the two bulbs are not interchangeable despite sharing the same wedge base style and operating voltage.
• The W2.1x9.5d base of the 12961 is a specific wedge base standard defined by IEC specifications, and substitutes must match this base configuration to seat correctly in the socket.
• Because the 12961 carries a manufacturer part number rather than an ANSI designation, equivalent replacements from other manufacturers must be confirmed to match the T10 form factor, W2.1x9.5d base, 12V rating, and 5W output.