W21W (7440) Super Canbus LED Bulbs 18W 1800LM White 5700K Fan Cooled

W21W (7440) Super Canbus LED Bulbs 18W 1800LM White 5700K Fan Cooled

Upgrade your vehicle's original W21W (7440) bulbs with these premium Super Canbus LED replacements. Producing up to 1800 lumens of crisp 5700K Cool White light, these high-performance LED bulbs deliver significantly improved brightness, faster illumination and a modern OEM-style appearance.

Each bulb features automotive-grade LED chips, an intelligent Super Canbus driver and an integrated high-speed cooling fan to provide outstanding reliability, efficient heat dissipation and improved compatibility with modern vehicle electrical systems.

Key Features

• Super Canbus W21W (7440) LED Bulbs
• Direct replacement for compatible W21W filament bulbs
• Up to 1800 Lumens high output
• 5700K Cool White LED light
• 18W power output per bulb
• Automotive-grade LED chips
• Built-in intelligent Super Canbus driver
• Designed to reduce bulb warning messages and flickering
• Integrated high-speed cooling fan
• Aviation-grade aluminium construction
• 360° light distribution
• Plug & Play installation
• Non-polarity design
• Instant illumination
• Energy-efficient operation
• Over 40,000-hour lifespan
• Supplied as a pair

Powerful 1800LM White LED Output

Each bulb produces up to 1800 lumens of bright 5700K cool white light, providing excellent visibility for compatible reverse lights, daytime running lights and other single-function lighting applications.

The clean white output gives your vehicle a modern OEM+ appearance while significantly improving illumination compared with many conventional filament bulbs.

Designed for W21W (7440) Applications

The W21W (7440) is a single-intensity wedge-base bulb used across many modern vehicles.

Unlike the dual-intensity W21/5W (7443), the W21W operates at one brightness level whenever the circuit is activated, making it suitable for reverse lights, daytime running lights, rear fog lights and other compatible single-function lighting applications.

Why Upgrade to LED?

Compared with traditional filament bulbs, LED technology provides faster illumination, greater energy efficiency and a cleaner, brighter light output.

The instant-on performance improves visibility while the integrated cooling system helps maintain stable light output during prolonged operation.

Intelligent Super Canbus Technology

Each bulb incorporates an intelligent Super Canbus driver designed to minimise dashboard bulb warning messages, flickering and electrical interference on many modern vehicles.

Whilst compatible with most Canbus systems, some vehicles with particularly sensitive bulb-monitoring circuits may still require an additional load resistor or Canbus decoder.

Advanced Active Cooling

A built-in high-speed turbine cooling fan continuously removes heat from the LED chips, helping maintain maximum brightness and extending component life.

Combined with the CNC-machined aviation-grade aluminium housing, the bulbs remain cooler during prolonged use for reliable long-term performance.

360° LED Light Distribution

The multi-sided LED chip arrangement closely replicates the position of the original filament, producing a wide and even light pattern throughout the reflector.

This helps maximise visibility while maintaining excellent light distribution from all viewing angles.

Ideal Applications

• Reverse Lights
• Reversing Lamps
• Daytime Running Lights (DRL)
• Rear Fog Lights
• Auxiliary Lighting
• Selected Brake Light Applications (vehicle dependent)
• Any compatible application requiring a W21W (7440) bulb
• Any compatible application requiring a W3x16d wedge base

Technical Specifications

W21W (7440) Compatibility

W21W and 7440 are commonly used references for the same single-intensity wedge-base automotive bulb.

These bulbs use a W3x16d wedge base and are not interchangeable with bayonet-style bulbs such as P21W (BA15S) or dual-intensity wedge bulbs such as W21/5W (7443).

Please remove and inspect your existing bulb before ordering. Always compare the bulb base and connector to ensure compatibility with your vehicle.

Package Contents

• 2 × Super Canbus W21W (7440) LED Bulbs
• Retail Presentation Box

Important Information

• Please check your existing bulb type before ordering.
• Designed for vehicles requiring W21W (7440) W3x16d wedge bulbs.
• Suitable for compatible reverse lights, DRLs and other single-function lighting applications.
• Not suitable as a replacement for W21/5W (7443) dual-intensity bulbs.
• Canbus compatible with most vehicles.
• Some vehicles with highly sensitive bulb-monitoring systems may still require additional resistors or decoders.
• Suitable for 12V vehicle electrical systems.
• Please ensure there is sufficient clearance inside the lamp housing for the fan-cooled bulb body.
• Road-use legality depends on the vehicle, lamp unit and intended application.

Why Buy from HIDS-DIRECT?

HIDS-DIRECT specialises in premium automotive lighting products, supplying high-quality LED upgrades trusted by thousands of customers across the UK.

Every product is carefully selected for performance, reliability and ease of installation, helping you upgrade your vehicle with confidence.

Frequently Asked Questions

Will these W21W LED bulbs fit my vehicle?

These bulbs are designed for vehicles that use a W21W (7440) bulb with a W3x16d wedge base. Please remove and inspect your existing bulb, consult your vehicle handbook or compare the bulb base before ordering.

Are W21W and 7440 the same bulb?

Yes. W21W and 7440 are commonly used references for the same single-intensity wedge-base automotive bulb. Both use a W3x16d wedge fitting and are widely used in modern vehicle lighting applications.

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

W21W (7440) is a single-intensity bulb with one brightness level. W21/5W (7443) is a dual-intensity bulb with separate high and low brightness functions. Although they look similar, they are designed for different applications and are not always interchangeable.

Can these bulbs be used as reversing lights?

Yes. These bulbs are ideal for compatible reverse light applications where a W21W (7440) bulb is fitted. Their powerful 1800-lumen cool white output provides excellent rear visibility when reversing.

Can these bulbs be used as Daytime Running Lights?

Yes, provided your vehicle uses a W21W (7440) bulb for the DRL function. Please check your existing bulb type and ensure there is sufficient space within the lamp housing for the fan-cooled LED body.

What colour light do these bulbs produce?

These bulbs produce a crisp 5700K Cool White light, providing a modern OEM-style appearance and improved visibility compared with conventional filament bulbs.

Are these bulbs Canbus compatible?

Yes. They include 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 an additional resistor or decoder.

Are these bulbs polarity sensitive?

No. These bulbs 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 contains an integrated high-speed turbine cooling fan that continuously removes heat from the LED chips to maintain stable light output and extend operating life.

Do I need to modify the wiring?

No. These bulbs are designed as a direct Plug & Play replacement for compatible W21W (7440) sockets. No rewiring or coding is normally required.

How many bulbs are supplied?

This product is supplied as a pack of two W21W (7440) LED bulbs.

Are these LED bulbs road legal?

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