The Hyundai Kona Electric brake light utilizes 1157 and P21/5W bulb sizes for the lighting system. Data for the specified components covers the period from 2019 through 2024.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1157 bulb follows the ANSI standard used in the United States and Canada. It is a dual-filament bulb operating at 12V with a power draw of 21W on the bright filament and 5W on the dim filament, mounted on a BAY15d bayonet base. The dual-filament design allows a single bulb to serve both brake and tail light functions simultaneously.
The Hyundai Kona Electric uses the 1157 bulb for the brake light position across the 2021-2024 model years without condition, establishing it as the standard fitment for that period.
For the 2019-2020 model years, the 1157 brake bulb fitment applies specifically to vehicles equipped with Halogen Capsule Headlamps, indicating that a trim or configuration variable affects which bulb specification is applicable.
The P21W bulb follows the ECE standard used in Europe and internationally. It is a single-filament signalling bulb operating at 12V and 21W, mounted on a BA15s bayonet base. Unlike the 1157, it carries only one filament and is therefore dedicated to a single lighting function.
The 2023-2024 Kona Electric specifies the P21W for the Center High Mount Stop Light position. The BA15s base of the P21W and the BAY15d base of the 1157 are not interchangeable, as the BAY15d base uses offset pins to prevent incorrect installation of single-filament bulbs in dual-filament sockets.