The Hyundai Excel brake light utilizes a 1157 bulb size for illumination across all recorded vehicle versions. Data for the specified component covers the range from 1986 to 1994.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Hyundai Excel uses the 1157 bulb for brake lighting across all documented model years, spanning 1986-1994.
The 1157 is a dual-filament bulb operating at 12V with a 21W/5W output and a BAY15d bayonet base, conforming to ANSI standards applicable in the United States and Canada.
The dual-filament design of the 1157 allows it to serve both brake and tail light functions within a single housing, which is a common arrangement in combined stop/tail lamp assemblies.
The Center High Mount Stop Light on the Hyundai Excel uses the 921 bulb for model years 1987-1994, while the 1986 model year uses the P21W instead.
The 921 is a single-filament wedge-type bulb (T15) rated at 12V and 16W, also conforming to ANSI standards. Its wedge base differs from the bayonet base found on the 1157, making the two bulbs non-interchangeable.
The P21W, specified for the 1986 Excel Center High Mount Stop Light, follows the ECE standard used in Europe and worldwide rather than the ANSI standard. It operates at 12V and 21W with a BA15s bayonet base.
The BA15s base of the P21W and the BAY15d base of the 1157 are physically distinct. The BAY15d base features offset locating pins to prevent incorrect single-filament and dual-filament bulb substitution, while the BA15s base uses symmetrical pins.