The Subaru BRZ headlight bulb utilizes a D4S size for both high beam and low beam functions. The replacement chart covers 2013 to 2016 model 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 D4S bulb type is used for both high beam and low beam headlight positions across all listed Subaru BRZ model years, spanning 2013-2016.
D4S is a high-intensity discharge (HID) xenon bulb, meaning it produces light by creating an electrical arc through xenon gas rather than heating a filament.
The D4S bulb operates at 42 volts and 35 watts, which are standard ratings for automotive HID systems and require a ballast to regulate the high-voltage ignition pulse needed to strike the arc.
D4S bulbs use a P32d-5 base, a keyed connector format that is not interchangeable with other HID base types such as D2S or D1S without modification.
The "S" designation in D4S indicates the bulb is intended for projector-type headlight housings, as opposed to the D4R variant, which carries a coating suited for reflector-type housings.
The D4S bulb conforms to the ECE standard, a regulatory framework recognized across Europe and many other markets worldwide, governing light output, color temperature, and safety requirements.
D4S bulbs are mercury-free, distinguishing them from earlier HID generations such as D2S, which contained mercury and are subject to disposal regulations in various jurisdictions.
Because the Subaru BRZ (2013-2016) uses the same D4S bulb for both high and low beam functions, the headlight system relies on the projector housing mechanism, rather than separate bulbs, to switch between beam patterns.