Chevrolet Celebrity Tail Light Bulb Size

Additional Notes

• The 2057 and 1157 bulbs share the same BAY15d bayonet base, which is a dual-contact offset-pin fitting designed to prevent incorrect insertion. Despite this physical compatibility, the two types are not electrically identical, as the 2057 operates at 26.9W/8W while the 1157 operates at 21W/5W.
• The 2057 is the most frequently specified tail light bulb across the Chevrolet Celebrity's production run, appearing in the 1983-1984, 1986-1988, and 1990 model years.
• Both the 2057 and 1157 are dual-filament bulbs, meaning each unit contains a high-intensity filament and a low-intensity filament within a single envelope. In tail light applications, this arrangement typically serves both the running light and brake light functions simultaneously.
• The 2057 is regarded as a higher-output variant of the 1157. Its high-beam filament draws 26.9W compared to the 1157's 21W, and its low-beam filament draws 8W compared to the 1157's 5W.
• The 1982 Chevrolet Celebrity uses the 1157 bulb, while the 1983 model year transitions to the 2057. Although both bulbs share the BAY15d base, substituting one for the other would result in a difference in output intensity.
• The 1985 model year stands apart from all other Celebrity model years in these specifications by using the 194, a single-filament miniature wedge bulb rated at 3.78W. The T10 wedge base of the 194 is physically incompatible with the BAY15d bayonet base used by the 2057 and 1157.
• All three bulb types listed, the 2057, 194, and 1157, conform to ANSI standards recognized in both the United States and Canada, indicating standardized electrical and photometric performance across manufacturers.
• The 194 bulb operates at 3.78W, a substantially lower wattage than either dual-filament type. This reflects its role as a low-load indicator or auxiliary lamp rather than a primary stop or running light source in configurations where it is used.