Land Rover Discovery Sport Back Up Light Bulb Size

Additional Notes

• The Land Rover Discovery Sport uses the 921 bulb for the back up light across all listed model years, spanning 2015-2019.
• The 921 is classified under the ANSI standardization system, which governs bulb designations used in the United States and Canada.
• The 921 follows the T15 wedge form factor, a designation that describes both the shape of the glass envelope and the base type, where the bulb is held in place by friction rather than a bayonet or screw mechanism.
• The T15 designation refers to a tubular glass envelope with a width of approximately 15 eighths of an inch, which is a standard sizing convention in the wedge bulb family.
• The 921 operates at 12 volts, consistent with the standard electrical system voltage found in conventional passenger vehicles.
• The bulb carries a 16-watt power rating, which reflects its energy draw from the vehicle's electrical system during operation.
• The wedge base of the 921 is not interchangeable with bayonet-style or screw-base bulb types, as the retention and contact method differs fundamentally between those formats.
• When replacing the back up light bulb on the Discovery Sport, the 921 designation serves as the fitment reference across the full 2015-2019 production span covered by these specifications.