Land Rover LR4 front fog light bulbs use H11 size while rear fog light bulbs use P21W size. The replacement chart covers 2010 through 2016 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Land Rover LR4 front fog lights use the H11 bulb across all listed model years, spanning 2010-2016.
The H11 is a single-filament halogen bulb operating at 12V and 55W, built to the ECE standard recognized in Europe and worldwide, and also approved for use in the United States.
The H11 bulb uses a PGJ19-2 base, a proprietary locking connector type that is not interchangeable with other common halogen bases such as H9 or H8, despite those bulbs sharing a physically similar housing.
The Land Rover LR4 rear fog lights use the P21W bulb for model years 2010-2014.
The P21W is a single-filament signalling bulb rated at 12V and 21W, also built to the ECE standard.
The P21W uses a BA15s bayonet base, which is a single-contact bayonet fitting. It is not interchangeable with the BA15d base, which carries two contacts, even though both share the same 15mm bayonet collar width.
The rear fog light specification covers only 2010-2014, while the front fog light specification extends through 2016, reflecting a difference in the year ranges covered between the two sub-parts.
The H11 and P21W bulbs serve distinct functions and are electrically incompatible with each other due to differing wattage ratings and base types, making cross-substitution between front and rear fog light positions unsuitable.