Genesis G80 high beam and low beam headlight bulbs use D1S size. The replacement chart covers 2017 to 2019 vehicle production years with bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The D1S bulb type is specified for both high beam and low beam headlight positions across all listed model years of the Genesis G80, covering 2017-2019.
D1S is a high-intensity discharge (HID) bulb format. It operates through an arc of electricity between two electrodes within a gas-filled quartz capsule, producing a bright, white-blue light output distinct from halogen technology.
The D1S designation indicates a single-beam HID bulb with an integrated igniter, meaning the igniter is built directly into the bulb base rather than housed separately in the ballast.
For the 2019 Genesis G80, the D1S specification is noted with the qualifier "With HID Headlamps," indicating that this fitment applies specifically to vehicles equipped with the HID headlamp configuration.
The shared D1S fitment across both high beam and low beam positions suggests the G80 uses a projector-style headlamp system, where a single HID bulb per housing serves both beam functions through a mechanical shutter or lens arrangement rather than separate bulb assemblies.
D1S bulbs are not interchangeable with D2S, D3S, or D4S variants despite physical similarities. Each designation reflects differences in igniter integration, operating voltage, and mercury content, making cross-substitution technically incompatible.