The Chevrolet Spectrum brake light requires a 1157 bulb size for proper installation and function within the lighting assembly. Data for the specified component covers the range from 1985 to 1988.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Chevrolet Spectrum uses the 1157 bulb for its brake lights across the 1985-1988 model years.
The 1157 is a dual-filament bulb operating at 12V with a 21W/5W output, meaning one filament handles braking and the other handles a lower-intensity running light function within the same housing.
The 1157 uses a BAY15d bayonet base, which features two offset pins to prevent incorrect installation of a single-filament bulb in its place.
The Center High Mount Stop Light on the Chevrolet Spectrum uses the 1156 bulb for the 1986-1988 model years.
The 1156 is a single-filament bulb rated at 12V and 21W, sharing the same wattage as the high-beam filament of the 1157 but without a secondary filament.
The 1156 uses a BA15s bayonet base, which has a single pin rather than the dual offset pins of the BAY15d base used by the 1157.
Although the 1156 and 1157 share a similar physical profile and the same 21W primary filament rating, their bases are not interchangeable due to the difference in pin configuration between BA15s and BAY15d.
Both the 1156 and 1157 are ANSI-standardized bulbs recognized across the United States and Canada, meaning replacements are widely available under those designations.