How many bulbs do I need?

This listing is for a single bulb. Some vehicles have multiple bulbs in the 3rd brake light, so double-check your vehicle and select the quantity needed to replace all of your bulbs.

Is this bulb street legal?

Yes, this bulb is designed to meet SAE/DOT "red" requirements. It provides the most light output through the red lens of the 3rd brake light, as the red lens acts as a filter, only allowing red light through.

How is this LED bulb more reliable than cheaper options?

Diode Dynamics LEDs are built with constant-current inductive circuitry, along with transient suppression. While more expensive than simple bulbs, this allows Diode Dynamics LEDs to last for years, with no flickering or failure.

Diode Dynamics 921 XPR LED Bulb - Red (Single)

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Diode Dynamics

Diode Dynamics 921 XPR LED Bulb - Red (Single)

Name: Diode Dynamics 921 XPR LED Bulb - Red (Single)
Brand: Diode Dynamics
Price: 61.39 USD
Availability: InStock

$61.39

Instant-on LED replacement for your factory 921 3rd brake light bulb. Provides quicker response and brighter light.

Key Features

Intense red LED illumination
Direct replacement — fits right in place of the factory 921 bulb
Plug and play — no modification needed
Instant on/off — faster response than standard bulbs
Constant-current inductive circuitry — long-lasting performance
Transient suppression — prevents flickering or failure

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

Will this fit your vehicle?

Compatible with 1189 vehicles

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Since 1957

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Product Details

The factory incandescent 3rd brake light bulb on most vehicles lights up in a glow which takes a moment to turn on. A modern LED upgrade provides instant response while also providing a modern LED appearance.