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📑 Contents
⚡ The best T4W bulbs in stock
Stock checked on October 7, 2026
The best T4W bulbs in stock
Hella 3893TB Bulb 3893 12V 4W Ba9S T2.75 (2), Multi
EBAIFUN 12V BA9S 64111 T4W LED Bulb BA9 53 57 1895 Light for Car White 10-Pack
BA9S LED Bulbs 6000K Xenon White Extremely Bright 5630 Chipsets 53 57 293 BA9 64111 1891 1895 T4W LED Bulbs…
BA9S LED Bulbs Ultra Blue Extremely Bright 5630 Chipsets 53 57 293 BA9 64111 1891 1895 T4W LED Bulbs for Car…
BA9S LED Bulbs 6000K Xenon White Extremely Bright 5630 Chipsets 53 57 293 BA9 64111 1891 1895 T4W LED Bulbs…
BA9S LED Bulbs Amber Yellow Extremely Bright 5630 Chipsets 53 57 293 BA9 64111 1891 1895 T4W LED Bulbs for…
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Cars that use a T4W 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 T4W 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 T4W bulb?
The T4W is a 4 W, 12 V automotive bulb with a BA9s base. It’s also sold as 3893.
Is the T4W the same as the W21/5W?
No. Even if they look alike, each size has a different base (BA9s on the T4W) and won’t fit another size’s socket. Always buy the exact size your car takes.
Can I replace a T4W 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).