The Hyundai Kona brake light utilizes 1157 and P21/5W bulb sizes for the rear lighting system. Data for the specified components covers the period from 2018 through 2023.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1157 is an ANSI-standardized bulb used across North American markets. It features a dual-filament design with a BAY15d bayonet base, operating at 12V with filament ratings of 21W for the brake function and 5W for the running light function. The dual-filament construction allows a single bulb to serve two lighting roles simultaneously.
The Hyundai Kona uses the 1157 as its brake bulb across the 2018-2023 model years, making it the dominant bulb type in these specifications.
The 2018-2020 model years carry a "With Halogen Capsule Headlamps" condition on the 1157 fitment, indicating that the brake bulb specification is tied to a specific headlamp configuration on those vehicles.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor. It uses a W2.1x9.5d wedge base, operates at 12V, and is rated at 5W, placing it in single-filament territory suited for lower-intensity lighting positions.
The 12961 bulb applies to the Inner Brake position on the Kona for the 2021 and 2023 model years. The BAY15d bayonet base of the 1157 and the W2.1x9.5d wedge base of the 12961 are physically incompatible, meaning the two bulb types are not interchangeable despite sharing the same vehicle application.