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⚡ The best P21/5W bulbs in stock
Stock checked on October 8, 2026
The best P21/5W bulbs in stock
iBrightstar 1157 LED Bulb Red, BAY15D 2057 2357 7528 LED Brake Light Bulbs Super Bright for Rear Brake Lights…
4PCS 1157 Led Brake Light Bulb, 12V-24V 1157 7528 2357 2057 BAY15D LED Bulb
4PCS 1157 Led Brake Light Bulb, 12V-24V 1157 7528 2357 2057 BAY15D LED Bulb
iBrightstar Super Bright 1157 2057 2357 7528 BAY15D P21/5W Switchback LED Bulbs with Projector Replacement…
2PCS 1157 Led Brake Light Bulb, 12V-24V 1157 7528 2357 2057 BAY15D LED Bulb
iFunyLED 4PCS 1157 LED Bulb Brake Tail Light 12V-24V Super Bright 2357 2057 7528 BAY15D LED Replacement Light…
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Cars that use a P21/5W bulb
We don’t have any cars with this bulb in our English database yet. Search for your car to see all its bulbs.
Which P21/5W to buy: standard, brighter or long life
- Standard: the classic incandescent bulb; cheap and no dashboard warnings.
- LED: whiter light and lower power draw. On turn signals and brake lights they can cause hyperflash or bulb-out warnings: choose CANbus versions or add load resistors.
- Long life: handy where bulbs are hard to reach (tail lights or dome lights).
To confirm which bulb each light on your car uses, follow the methods in how to find out which bulb your car takes.
Signal & interior bulbs
Frequently asked questions
What is a P21/5W bulb?
The P21/5W is a 21/5 W, 12 V automotive bulb with a BAY15d base. It’s also sold as 1157 and 380.
Is the P21/5W the same as the R10W?
No. Even if they look alike, each size has a different base (BAY15d on the P21/5W) and won’t fit another size’s socket. Always buy the exact size your car takes.
Can I replace a P21/5W with an LED?
Yes, LEDs are common for turn signals, parking, license plate and dome lights. Pick CANbus versions or use load resistors to avoid hyperflash and bulb-out warnings, and keep the correct color (amber for turn signals, red for brake lights).