Automotive Bulb Bosch P21W Pure Light 12V 21W, 2 pcs (1987301017)

Bosch P21W Pure Light 12V 21W automotive bulb, supplied as a set of two, is a single-filament incandescent lamp intended for exterior vehicle signaling and brake/taillight sockets compatible with P21W fittings. The lamp provides the standard luminous output expected from a 21W bulb and is suitable for replacement in passenger cars and light commercial vehicles where conventional incandescent bulbs are used. The design follows Bosch quality standards for fitment, electrical compatibility, and consistent light performance for common automotive lighting circuits.

Advantages

The Bosch P21W Pure Light bulb offers reliable, consistent illumination with predictable voltage and wattage characteristics, making it straightforward to replace existing P21W bulbs without electrical adjustments. Supplied in pairs, this product simplifies synchronized replacement on both sides of the vehicle. The bulb's conventional filament technology ensures compatibility with standard reflectors and sockets used in many makes and models.

Suitable for

• Exterior signaling: turn indicators and rear position lights compatible with P21W sockets
• Brake lights and rear fog lights where single-filament 21W bulbs are specified
• Replacement and maintenance of lighting circuits in passenger cars and light commercial vehicles

Key specifications

• Type: single-filament incandescent automotive bulb
• Nominal voltage: 12 V
• Nominal power: 21 W
• Base/fitting: P21W-compatible bayonet
• Pack quantity: 2 bulbs
• Typical application: exterior signaling and brake/taillight sockets

How to use

Ensure the vehicle ignition is off and the relevant circuit is not live before replacing bulbs. Access the rear lamp cluster or indicator housing according to the vehicle manufacturer's instructions, remove the defective bulb by pressing and twisting or by pulling as appropriate for the P21W bayonet fitting, and insert the Bosch P21W Pure Light bulb until it seats securely. Test the light function after installation; if the bulb does not illuminate, verify socket condition and fuse integrity before proceeding.

Usage recommendations

Replace bulbs in pairs when possible to maintain balanced light output on both sides. Handle the glass envelope with clean hands or gloves to avoid contamination; while this is less critical for incandescent bulbs than for halogen types, keeping contacts and bulb seating free of corrosion will support reliable operation.