The Lamborghini Murcielago tail light requires a P21/5W bulb size for proper installation and function within the rear lighting assembly. Data provided for the specific bulb requirements covers the production range from 2001 to 2006.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The P21/5W is the sole bulb type specified for the inner tail light position across the Lamborghini Murcielago lineup from 2001-2010.
P21/5W is an ECE-regulated standard, meaning it conforms to European and internationally recognized automotive lighting requirements rather than SAE standards used in North America.
The P21/5W is a dual-filament bulb, operating at 12 volts with two separate wattage ratings: 21W for the brighter filament and 5W for the dimmer filament, allowing it to serve two distinct lighting functions within a single housing.
The base type for the P21/5W is the BAY15d bayonet mount, which features offset pins to prevent incorrect installation. A single-filament bulb sharing the same base diameter would not be a compatible substitute due to the pin offset difference.
Because the Lamborghini Murcielago (2001-2010) uses the same P21/5W specification across all model years for the inner tail light, bulbs sourced for any year within that range are interchangeable with one another in this position.