Automotive P21W BA15s 21W 12V bulb, pack of 10, universal

Incandescent Automotive P21W BA15s 21W 12V bulb supplied as a pack of 10. The lamp features a BA15s single-contact bayonet base and a 21-watt filament designed for 12-volt vehicle electrical systems. It is intended for common automotive uses such as turn signals, brake lights, reverse lights and other circuits that accept P21W/BA15s bulbs. The pack of 10 provides multiple replacements for passenger cars and light commercial vehicles with compatible sockets.

Advantages

The bulb offers a standard P21W light output and conventional incandescent color rendering compatible with many existing automotive lamp holders. The BA15s bayonet base ensures a secure mechanical and electrical connection in compatible sockets. Supplied in a multi-pack of 10, it simplifies maintenance and periodic replacement schedules for multiple lamp positions. The simple design allows direct replacement without additional adapters or modifications.

Suitable for

• Turn signal indicators on passenger cars and light commercial vehicles
• Brake light circuits that accept P21W/BA15s lamps
• Reverse and backup lights in compatible housings
• Interior and exterior auxiliary lighting where a 21W incandescent lamp is specified

Key specifications

• Bulb type: Incandescent filament
• Nominal power: 21 W
• Nominal voltage: 12 V
• Base type: BA15s (single-contact bayonet)
• Quantity: Pack of 10 bulbs
• Application: Automotive signal and auxiliary lighting

How to use

Switch off the vehicle ignition and ensure the circuit is not powered before replacing bulbs. Remove the lamp cover or housing according to the vehicle manufacturer’s instructions, press and twist the BA15s bulb to release it from the socket, and pull it out. Insert the new P21W BA15s bulb into the socket with a push-and-twist action until it locks in place, reassemble the housing and restore power to check correct operation. Replace bulbs in matched positions when required to ensure uniform light output across paired lamps.

Usage recommendations

Use these bulbs in fixtures designed for 12 V incandescent lamps and BA15s bases. Avoid touching the glass with bare hands on halogen or specialty lamps; for standard automotive incandescent bulbs, handle by the base where possible. Replace bulbs in pairs for symmetrical lighting on left and right sides, and verify correct polarity and socket compatibility before installation.