Auxbeam B21 3157 switchback bulbs with dual-color white and amber for DRL and signals.
Auxbeam B21 3157 switchback dual-color bulbs for bright white and amber signaling.
Auxbeam B21 built-in CANBUS resistor reduces decoding errors.
Auxbeam B21 360-degree beam provides full illumination around vehicle.
Auxbeam B21 4-layer cooling system for longevity and consistent performance.
Auxbeam B21 amber turn signals paired with white DRL for visibility.
Auxbeam B21 plug-and-play design fits US sockets for easy installation.
Auxbeam B21 3157 switchback bulbs with dual-color white and amber for DRL and signals.
Auxbeam B21 3157 switchback dual-color bulbs for bright white and amber signaling.
Auxbeam B21 built-in CANBUS resistor reduces decoding errors.
Auxbeam B21 360-degree beam provides full illumination around vehicle.
Auxbeam B21 4-layer cooling system for longevity and consistent performance.
Auxbeam B21 amber turn signals paired with white DRL for visibility.
Auxbeam B21 plug-and-play design fits US sockets for easy installation.

Auxbeam B21 Series 3157 Switchback LED Bulbs – CANBUS, Dual-Color White/Amber, 600% Bright

Meet the Auxbeam B21 Series 3157 Switchback LEDs Dual-color illumination blends cool white DRL with amber turn...
Vendor: Auxbeam
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£56.37
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Auxbeam B21 3157 switchback bulbs with dual-color white and amber for DRL and signals.

Auxbeam B21 Series 3157 Switchback LED Bulbs – CANBUS, Dual-Color White/Amber, 600% Bright

£56.37
Auxbeam B21 3157 switchback bulbs with dual-color white and amber for DRL and signals.
Auxbeam B21 3157 switchback dual-color bulbs for bright white and amber signaling.
Auxbeam B21 built-in CANBUS resistor reduces decoding errors.
Auxbeam B21 360-degree beam provides full illumination around vehicle.
Auxbeam B21 4-layer cooling system for longevity and consistent performance.
Auxbeam B21 amber turn signals paired with white DRL for visibility.
Auxbeam B21 plug-and-play design fits US sockets for easy installation.

Auxbeam B21 Series 3157 Switchback LED Bulbs – CANBUS, Dual-Color White/Amber, 600% Bright

£56.37
Description
Description
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Meet the Auxbeam B21 Series 3157 Switchback LEDs

Dual-color illumination blends cool white DRL with amber turn signals in a single, compact bulb. With a built-in CANBUS system, these bulbs are designed to minimize decoding issues across many standard sockets. Note: not suitable for Toyota Tundra or Tacoma; for some sensitive models (like certain Silverado, RAM, and Ford trucks) you may need additional resistors.

What makes them stand out

  • Dual-color operation: White for parking/DRL and amber for signaling, with a distinct amber-off-amber-off sequence for visibility.
  • High brightness and quick response: 28W per bulb delivering up to 6500K cool white or 3500K amber light, with instant-on performance.
  • CANBUS error-free: Built-in resistor helps reduce decoding warnings and hyper-flash on standard sockets.
  • 360° illumination: A full halo of light with no dark spots.
  • Advanced cooling for longevity: 12,000 RPM silent fan, copper ring, 16 heat sinks, and 6063 aluminum housing.
  • Durability and weather resistance: IP68-rated waterproof and dustproof construction.

Engineering for real-world use

Designed for replacement on US-standard sockets such as 3157, 3157A, 3057, 3457, 4157 and more. The bulbs are polarity sensitive; if they don’t light, try flipping the plug. They are a plug-and-play solution—no drilling or wiring required in typical installations.

  • Long-lasting lighting: The robust cooling system helps extend life up to an estimated 60,000 hours.
  • Reliable in diverse conditions: IP68 rating protects against water and dust in driving rain or dusty roads.

Practical benefits you might notice

  • Better signaling visibility from a distance during daytime and night driving.
  • Clean, modern aesthetic with dual white/amber states for DRL and turn signals.
  • Consistent performance across a wide range of vehicles using standard sockets.

As you shop, keep in mind compatibility notes and installation tips. If you have questions about fitment for your vehicle, our support team can help you explore options and potential resistors when needed.

FAQ

Q: What are the key benefits of the Auxbeam B21 3157 Switchback bulbs?

A: Dual-color white DRL and amber turn signals, CANBUS compatibility, and strong brightness.

Q: How do I know if these bulbs fit my vehicle?

A: Designed for US sockets like 3157/3157A/3057; check fitment notes and consider resistors for sensitive models.

Shipping & Return
Shipping & Return
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Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

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We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

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