Auxbeam B21 Series 1157 Switchback LED Bulbs – CANBUS, Anti Hyper Flash, White & Amber
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Description
xOverview
Meet the Auxbeam B21 Series 1157 Switchback LED Bulbs, a dual‑color lighting solution that blends bright white parking lights with amber turn signals in a single compact unit. Built with a CANBUS‑style driver, these bulbs are designed to reduce decoding issues on many vehicles, often without the need for extra resistors. The result is a clean, high‑contrast signal that’s easy to notice in daylight and at night.
With a focus on visibility and ease of use, the B21 switches between white DRL and amber signaling without complicated wiring. The design aims for instant illumination when you switch modes, so you can rely on a crisp response during lane changes or signaling maneuvers.
Dual color function and visibility
The dual color setup lets you reuse a single bulb for both parking/DRL lighting and turn signals. This separation between white and amber helps drivers and pedestrians identify your intentions from a distance, especially in bright conditions.
- 6500K cool white DRL for daytime visibility
- 3500K amber turn signal for conspicuous signaling
Performance and longevity
Each bulb packs 36 upgraded 3030 SMD chips, delivering strong brightness with an instant-on response. At about 28W per bulb, the system aims for a noticeable, immediate glow without warm-up delays, helping your signals stand out as you drive.
The design provides a full 360° beam, reducing shadows and ensuring consistent illumination around the lamp housing.
- Instant-on brightness
- 360° full illumination without dark spots
Durability and cooling
To support long life, the B21 uses a four‑layer cooling system, including a 12,000 RPM silent fan, a copper cooling ring, multiple heat sinks, and a rugged aluminum body. The IP68 waterproof and dustproof rating adds resilience for daily driving in challenging conditions.
- IP68 waterproof and dustproof
- Long lifespan up to 60,000 hours (typical)
Compatibility and installation
Designed for US standard sockets (e.g., 1157, 2057, 2357 variants). The bulbs are polarity sensitive, so if they don’t light, try flipping the connector. Note that they are not compatible with certain models listed in the exclusions; in some cases, extra resistors may be required for highly sensitive systems.
- Plug-and-play for most 1157/2057 style sockets
- Not compatible with all models; check the exclusions
Warranty and support
Auxbeam offers a 1-year warranty on these bulbs. If you have questions about compatibility or performance, our support team is ready to help with guidance and troubleshooting.
FAQ
Q: Is the Auxbeam B21 Series CANBUS-compatible and error-free?
A: Yes. These bulbs are designed to minimize decoding issues on most vehicles without external resistors.
Q: Are there exclusions I should know about before buying?
A: Some models are not supported (CK sockets, certain makes and years). See product notes for the full list.
Shipping & Return
xReturns 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.
Shipping
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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