Land Rover Range Rover Back Up Light Bulb Size

The Land Rover Range Rover back up light utilizes H6W, H21W, and P21W bulb sizes for the rear illumination system. Available data for the specified vehicle covers the period from 1987 through 2016.

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
2015-2016	H6W
2010-2012	H6W
2006-2009	H21W
1996-2005	P21W
1994	P21W
1987-1988	P21W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BAX9s base. 12V, 6W.	H6W
ECE standard (Europe & worldwide). Single-filament signalling bulb with BAY9s base. 12V, 21W.	H21W
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W

Other Locations

Additional Notes

The Land Rover Range Rover backup light specifications cover three distinct bulb types across the model's history: H6W, H21W, and P21W.
All three bulb types conform to ECE standards, meaning they are recognized for use in European and worldwide markets rather than SAE-governed North American standards.
The P21W is the most frequently specified bulb across the Range Rover's backup light history, covering model years 1987-1988, 1994, and 1996-2005.
The P21W operates at 12V and 21W, using a BA15s single-contact bayonet base. The BA15s designation indicates a 15mm base with a single contact pin offset to one side.
The H21W, specified for the 2006-2009 Range Rover, shares the same 12V and 21W electrical rating as the P21W but uses a BAY9s base rather than a BA15s base, making the two bulbs physically incompatible despite identical wattage.
The BAY9s base on the H21W features offset pins in a different configuration from the BA15s, which prevents accidental cross-installation between the H21W and P21W.
The H6W, specified for model years 2010-2012 and 2015-2016, operates at a significantly lower wattage of 6W compared to the 21W rating of both the H21W and P21W.
The H6W uses a BAX9s base, which is distinct from both the BAY9s of the H21W and the BA15s of the P21W, making it incompatible with either of the other two bulb types used in earlier Range Rover model years.
All three bulb types are single-filament signalling bulbs operating on a 12V electrical system, consistent with standard automotive low-voltage architecture.
The base type differences among the H6W (BAX9s), H21W (BAY9s), and P21W (BA15s) mean that none of the three bulbs specified across the Range Rover's backup light history are interchangeable with one another.