Light bulb 1057 12 V/21 W BA15S

1057 12V/21W BA15S Bulb for Trailer Rear and Brake Lights

The 1057 bulb is essential for maintaining safe trailer lighting, providing reliable illumination for rear and brake light functions. This single-filament bulb ensures your trailer is visible to other road users, which is critical for safe towing operations and regulatory compliance.

Spare lamp for trailer lights

This bulb features a BA15S single-contact base and is rated at 12V with 21W power output, making it ideal for standard trailer light assemblies. The single-filament design delivers consistent brightness for rear and brake light applications, and installation is straightforward through the existing socket in your trailer light housing.