W21/5W (7443) Super Canbus Red LED Brake & Tail Light Bulbs 300LM Fan Cooled

W21/5W (7443) Super Canbus Red LED Brake & Tail Light Bulbs 300LM Fan Cooled

Upgrade your vehicle's original W21/5W (7443) filament bulbs with these premium Super Canbus Red LED replacements. Designed for vehicles requiring a dual-intensity brake and tail light bulb, these LED bulbs produce a crisp 300-lumen red output on high brightness while maintaining a lower tail light output for normal driving.

Each bulb combines automotive-grade LED chips, an intelligent Super Canbus driver and an integrated high-speed cooling fan to deliver reliable performance, rapid illumination and improved compatibility with modern vehicle electrical systems.

Key Features

• Super Canbus W21/5W (7443) Red LED Bulbs
• Dual-intensity brake & tail light operation
• Brightness: 300 Lumens (Brake) / 90 Lumens (Tail)
• Lower tail light output
• Pure Red LED colour
• 18W power output per bulb
• Automotive-grade LED chips
• Built-in intelligent Super Canbus driver
• Designed to reduce dashboard bulb warnings and flickering
• Integrated high-speed turbine cooling fan
• Aviation-grade aluminium construction
• 360° LED light distribution
• Plug & Play installation
• Non-polarity design
• Energy-efficient operation
• Over 40,000-hour lifespan
• Supplied as a pair

Designed for Dual-Intensity Brake & Tail Lights

The W21/5W (7443) is a dual-intensity wedge bulb that performs two separate lighting functions using a single bulb.

During normal driving, the bulb operates at a lower brightness as a tail light. When the brake pedal is applied, it immediately switches to full brightness to provide a clear stop signal to following traffic.

This makes the W21/5W one of the most common bulb types used for combined brake and tail light applications on many modern vehicles.

Pure Red LED Output

Unlike conventional filament bulbs, these LEDs generate red light directly from the LED chips rather than relying on white light passing through a coloured lens.

This produces a rich, clearly defined red colour that provides excellent visibility through both clear and red lamp lenses where a red W21/5W bulb is specified.

Instant Brake Light Response

LED technology reaches full brightness almost instantly when electrical power is applied.

The rapid response helps make your braking intentions more visible to following drivers whilst giving your rear lighting a sharper, more modern appearance.

Intelligent Super Canbus Technology

Each bulb incorporates intelligent Super Canbus electronics designed to minimise dashboard bulb warnings, flickering and shut-off issues on many modern vehicles.

Whilst compatible with most Canbus systems, some vehicles with particularly sensitive bulb-monitoring systems may still require additional load resistors or Canbus decoders.

Advanced Active Cooling

A built-in high-speed turbine cooling fan continuously removes heat from the LED chips whilst the aviation-grade aluminium body rapidly dissipates heat to maintain stable light output and long service life.

360° LED Light Distribution

The multi-sided LED arrangement closely replicates the position of the original filament, helping produce an even light pattern throughout the reflector and excellent visibility from all viewing angles.

Ideal Applications

• Brake Lights
• Tail Lights
• Stop Lights
• Rear Combination Lamps
• Rear Position Lights
• Any compatible application requiring a W21/5W (7443) bulb
• Any compatible application requiring a W3x16q wedge base

Technical Specifications

W21/5W (7443) Compatibility

W21/5W and 7443 are commonly used references for the same dual-intensity automotive wedge bulb.

These bulbs use a W3x16q wedge base with separate electrical circuits for tail light and brake light operation.

Do not confuse them with the single-intensity W21W (7440). Although the two bulbs look similar externally, they perform different functions and are not always interchangeable.

Package Contents

• 2 × Super Canbus W21/5W (7443) Red LED Bulbs
• Retail Presentation Box

Important Information

• Please check your existing bulb before ordering.
• Designed for vehicles requiring W21/5W (7443) W3x16q wedge bulbs.
• Dual-intensity brake and tail light operation.
• Not suitable for W21W (7440) single-intensity applications.
• Canbus compatible with most vehicles.
• Some vehicles may still require additional resistors or decoders.
• Suitable for 12V vehicle electrical systems.
• Please ensure sufficient clearance for the fan-cooled bulb body.
• Road-use legality depends on the vehicle and intended application.

Why Buy from HIDS-DIRECT?

HIDS-DIRECT specialises in premium automotive lighting products trusted by thousands of UK motorists.

Every product is carefully selected for performance, reliability and ease of installation.

Frequently Asked Questions

Will these W21/5W red LED bulbs fit my vehicle?

These bulbs are designed for vehicles that use a W21/5W (7443) bulb with a W3x16q wedge base. Please remove and inspect your existing bulb, consult your vehicle handbook or compare the bulb base before ordering.

Are W21/5W and 7443 the same bulb type?

Yes. W21/5W and 7443 are commonly used references for the same dual-intensity automotive wedge bulb. Both use a W3x16q wedge fitting with separate high and low brightness circuits.

What is the difference between W21/5W and W21W?

W21/5W (7443) is a dual-intensity bulb with separate low and high outputs for tail and brake light operation. W21W (7440) is a single-intensity bulb with only one brightness level. Although they can look similar, they are designed for different applications.

Do these bulbs provide both brake and tail light functions?

Yes. These bulbs provide a lower 90-lumen output for the tail or rear position light and a brighter 300-lumen output for the brake light function.

What colour light do these bulbs produce?

These bulbs produce a strong, pure red LED light. The red colour is generated directly by the LED chips rather than by white light passing through a tinted bulb coating.

Can these bulbs be used behind a clear lens?

Yes, provided the lamp unit requires a red W21/5W (7443) bulb. Because the LED chips produce red light directly, they are suitable for many compatible clear-lens rear lamp units.

Can these bulbs be used behind a red lens?

Yes, provided the original bulb type and electrical specification are correct. A dedicated red LED can produce a rich and clearly defined output through a red lamp lens.

How bright are these bulbs?

The high-output brake light function produces up to 300 lumens, while the low-output tail light function produces approximately 90 lumens.

Are these bulbs Canbus compatible?

Yes. They feature built-in Super Canbus electronics designed to reduce dashboard bulb warnings, flickering and shut-off issues on many modern vehicles. Some vehicles with particularly sensitive bulb-monitoring systems may still require additional load resistors or Canbus decoders.

Are these bulbs polarity sensitive?

No. They feature a non-polarity design, allowing them to operate regardless of the positive and negative electrical orientation within a compatible socket.

Do these bulbs have a cooling fan?

Yes. Each bulb incorporates a built-in high-speed turbine fan that helps remove heat from the LED chips, maintaining stable brightness and supporting a long service life.

Do I need to modify the wiring?

No. These bulbs are designed as a direct Plug & Play replacement for compatible W21/5W (7443) sockets. No rewiring or coding is normally required.

How many bulbs are supplied?

This product is supplied as a pack of two W21/5W (7443) red LED bulbs.

Are these red LED bulbs road legal?

Road-use legality depends on the vehicle, lamp unit and intended application. LED retrofit bulbs may not be approved for every exterior lighting application, so please check the relevant vehicle-lighting regulations before installation.