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7443 & 7440 LED Bulbs

Upgrade your vehicle’s exterior lighting with Underground Lighting’s 7443 and 7440 LED bulbs. Explore red, amber, white, switchback, CANBus, and no-hyperflash options for compatible brake lights, tail lights, turn signals, reverse lights, parking lights, and daytime running lights.
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7443/7440 LED Replacement Bulbs for Brake, Turn, Tail & Reverse Lighting

The 7443 bulb is a dual-filament halogen bulb supporting two brightness levels, tail and brake or DRL and signal, for better nighttime visibility. It is rated at 21W/5W OEM power, while the 7440 bulb is the single-filament version rated at 21W for dedicated turn, brake or reverse functions.

Although physically identical, 7443 and 7440 differ electrically. A 7443 can operate in a 7440 socket, but a 7440 cannot provide dual-intensity functionality in a 7443 circuit.

This collection covers both 7443 and 7440 LED bulbs, the LED upgrades of the OEM 7443 dual-filament bulb and 7440 single-filament bulb. Both use the W3x16q wedge base with four electrical contact pads for 12V automotive signaling circuits.

These bulbs are factory-standard across rear lighting systems in many vehicles. The 7443 provides dual-intensity output, with 21W brake and 5W tail functions, while the 7440 provides single-intensity 21W signaling or reverse output.

The LED replacement bulbs convert the filament light source to solid-state LED emitters while preserving the OEM wedge-base geometry and contact orientation required for direct socket compatibility. LED versions typically operate at approximately 3–8W and may include CANBus load-matching resistors or driver IC circuits to maintain correct electrical behavior in modern vehicles with bulb-monitoring ECUs.

Electrical & Functional Attributes

  • Voltage: Compatible with 12V automotive systems
  • Base: W3x16q wedge push-in fitment
  • 7443 circuit: Dual circuit for tail and brake or DRL and signal
  • 7440 circuit: Single circuit for turn signal, reverse, or brake applications
  • Halogen wattage: 21W for 7440 and 21W/5W for 7443
  • Typical LED equivalent: Approximately 3–8W
  • LED brightness range: Approximately 500–1,800+ lumens, with up to approximately 12,000 lumens in selected reverse-light kits

Because the 7443 LED bulb retains dual-channel driver circuitry, it can reproduce OEM tail-and-brake brightness separation. The 7440 LED bulb provides single-channel, high-output signaling or reverse illumination.

Although the bulbs are physically similar, they are not functionally interchangeable in every circuit. A 7443 can operate in many 7440 sockets, but a 7440 cannot replicate the dual-intensity operation required by a 7443 circuit.

Lighting Functions Covered in This Collection

Brake & Tail Lights

Red 7443 LED bulbs provide dual-brightness output, preserving the OEM low-power tail-light function and higher-power brake-light illumination.

Turn Signal Lights

Amber 7440 and 7443 LED bulbs provide directional signaling with approximately 2000K amber output for strong daytime visibility and proper signaling color.

Reverse Light Upgrades

White 7440 LED bulbs provide high-lumen 6000K output to improve rearward illumination and camera visibility. Selected reverse-light kits provide output of up to approximately 12,000 lumens.

Parking and DRL Lights

White 7443 LED bulbs can support compatible low-intensity running-light or daytime-running-light circuits in front or rear housings.

Switchback LEDs

7443 white-and-amber switchback LEDs provide white running-light output and switch to amber when the turn signal is activated in compatible clear-lens housings.

Optical & Housing Compatibility

7443/7440 bulbs are easy to install in compatible reflector-based rear lamp housings and lens-filtered assemblies.

Traditional halogen filaments emit light in multiple directions. LED replacements in this category use multi-chip radial emitter arrays designed to reproduce broad filament-style light distribution and provide fuller reflector coverage.

Correct emitter placement helps reduce hotspots, dark areas, and uneven illumination across tail-light, brake-light, signal, and reverse-light functions.

CANBus & Hyperflash Control

LED bulbs draw less current than halogen bulbs. In vehicles with bulb-monitoring ECUs, this lower electrical load can trigger hyperflash, dashboard bulb-out warnings, or other compatibility issues.

Many bulbs in this collection include built-in load resistors or CANBus drivers calibrated to approximate the electrical signature of a 21W halogen bulb. This helps maintain a normal turn-signal flashing rate and correct dashboard status.

Some particularly sensitive vehicles may still require external resistors.

If you still face an issue and need assistance, follow our guide covering common issues with 7440 & 7443 bulbs and how to solve the issues easily.

Technology Variants in This Collection

  • Red 7443 brake and tail-light LEDs with integrated resistors
  • Amber 7440 and 7443 turn-signal LEDs
  • White CANBus 7440 and 7443 LEDs for reverse lights and DRLs
  • White-and-amber 7443 switchback LEDs
  • High-lumen 7440 reverse-light kits
  • Parking-light and DRL LED variants

Because LEDs draw less current than halogen bulbs, some vehicles may detect them as failed bulbs and trigger hyperflash or dashboard warnings. Many products in this collection include CANbus resistors or load circuitry designed to mimic halogen current and maintain the correct flashing rate.

Housing compatibility includes reflector or lens-filtered rear lamp assemblies, where LED emitters must provide broad beam coverage to match filament distribution. In coloured lenses, white LEDs rely on lens filtering, while clear lenses require amber or red LEDs to maintain the intended lighting color.

This category supports full rear-lighting conversion through Underground Lighting, including brake, turn, tail, reverse and DRL upgrades within the same bulb platform.

Discover premium automotive lighting solutions across HIDS, LEDs and full Forward Lighting systems.

From essential Headlight and Fog Light Bulbs to dynamic Switchback and Turn Signal upgrades, we have you covered.

Enhance stopping-power visibility with Brake/Tail Lights and improve rear safety using Reverse Lights.

Complete your setup with HID Ballasts, Resistors, Lighting Accessories, and custom LED lighting enhancements.

Check your compatibility instantly and explore the full range today.

Benefits of Underground Lighting 7443/7440 LED Bulb Upgrades

  • Instant LED Illumination Improves Reaction Time

    Underground Lighting LED brake and signal bulbs illuminate immediately, reducing the delay associated with heated filaments and helping following drivers see braking and signaling actions sooner.

  • Higher Visibility With Up to ~500–1800+ Lumens

    Underground Lighting offers outputs from approximately 500–1,800+ lumens, with selected reverse kits reaching approximately 12,000 lumens for stronger brake, turn, and reverse-light visibility.

  • Dual-Intensity Function Retained in 7443 Circuits

    Underground Lighting 7443 LED bulbs retain the low-output tail or DRL function and higher-output brake or signal function required by compatible dual-intensity circuits.

  • Lower Power Draw and Reduced Heat

    Underground Lighting LED bulbs typically consume approximately 3–8W compared with 21W halogen bulbs, reducing electrical demand and heat around compatible wiring, sockets and housings.

  • CANbus Error-Free Operation With Integrated Resistors

    Selected Underground Lighting bulbs include integrated resistors or CANBus ICs that mimic halogen current, helping maintain the correct flashing rate and prevent dashboard bulb warnings.

  • Long LED Lifespan (30,000–50,000 Hours)

    Underground Lighting’s solid-state LED bulbs eliminate fragile filaments and are designed to provide longer-lasting performance across brake, tail, turn-signal, and reverse-light applications.

How to Choose the Right 7443/7440 LED Bulbs for Your Vehicle

Selecting the right 7443 or 7440 LED bulb begins with confirming the original bulb number and the function it performs in your vehicle. Although these bulbs have similar wedge-style bases, the 7443 supports two brightness levels while the 7440 normally provides one.

You should also consider the bulb color, lighting position, and whether your vehicle uses CANBus monitoring. Matching all of these factors helps maintain the factory lighting function and reduces the risk of hyperflash, bulb-out warnings, or incorrect output.

  • Check your vehicle’s manual: Review the replacement-bulb or lighting-specifications section to confirm whether the vehicle requires a 7443, 7440 or related bulb type.
  • Use the Vehicle Finder Tool: Enter the vehicle’s year, make and model to identify compatible options for the exact brake, tail, turn-signal, reverse, parking or DRL position.
  • Confirm the lighting function: Choose a 7443 for compatible dual-intensity applications and a 7440 for compatible single-intensity applications.
  • Select the correct color: Use amber for applicable turn signals, red for brake and tail lights, and white for reverse lights, parking lights, or DRLs.
  • Check CANBus requirements: Select a bulb with integrated resistors or CANBus support when the vehicle is likely to detect the lower electrical load of an LED.
  • Choose the appropriate output: Standard-output bulbs may suit routine signaling applications, while higher-output options can provide greater usable light in reverse-light housings.

At Underground Lighting, we provide fitment guidance and customer support to help you select the correct LED bulb. For assistance choosing the right option, contact us today.

Watch these helpful Underground Lighting videos for step-by-step guidance, product details, and real-world installation tips.

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7443/7440 LED Bulbs FAQs

Yes, in many vehicles a compatible LED replacement can fit the original 7443 or 7440 socket. The replacement must still match the required bulb function, electrical contacts, housing clearance, and vehicle monitoring system. A 7443 application may require dual-intensity operation, while a 7440 is typically used for a single-intensity function.

7443 and 7440 LED bulbs typically cost around $30 to $110 per pair or kit, depending on brightness, color, CANbus compatibility, built-in load resistance, switchback functionality, cooling design, and whether the product is a standard replacement bulb or a high-output reverse-light kit. Basic LED pairs are usually less expensive, while resistor-equipped and high-output systems generally cost more.

A 7443 bulb is designed for dual-intensity operation, making it suitable for applications such as tail and brake lights or DRL and turn signals. A 7440 bulb is generally a single-intensity bulb used for functions such as turn signals or reverse lights. They are similar in size, but their electrical functions are different, so the correct bulb should match the vehicle's original circuit.

For better understanding, please read our detailed overview for this. 

Rapid flashing, or hyperflash, usually occurs because an LED draws less current than the original incandescent bulb. The vehicle may interpret the lower electrical load as a failed turn-signal bulb and increase the flash rate. A no-hyperflash LED with built-in resistance can help correct the issue, although some vehicles may still require an external load resistor or another compatible load-management solution.

Many vehicles monitor exterior lighting circuits by measuring electrical load. Because an LED draws less current than an incandescent bulb, the vehicle may register a bulb-out warning even when the LED is operating normally. A CANbus-compatible bulb, decoder, or properly matched resistor can help in affected vehicles.

A 7443 bulb uses separate electrical contacts for its low- and high-intensity functions. If only one mode works, the cause may be incorrect bulb orientation, incompatible contact placement, socket damage, wiring issues, or an LED that does not support the required dual-intensity circuit.

It may illuminate through the lens, but a white LED is not always the best choice. Colored lenses filter out much of the light that does not match their intended color, which can reduce usable output and color saturation. A red LED behind a red lens or an amber LED behind an amber lens generally produces a more consistent result.

Some vehicles continue sending a small diagnostic or monitoring current through the lighting circuit after the lamp is switched off. An efficient LED can respond to this current and remain faintly illuminated. A compatible CANbus bulb, decoder, or correctly selected load solution may help if the residual glow is noticeable.

No. High-output reverse-light bulbs may use larger LED assemblies, heat sinks, fans, or drivers than standard replacements. Check the bulb dimensions, available housing clearance, socket depth, and any rear cover or dust-cap space before installation. The live collection includes a dedicated high-output 7440 reverse-light kit, so fitment should be confirmed separately from standard replacement bulbs.

It is generally recommended when both sides perform the same lighting function. Replacing bulbs in pairs helps maintain consistent color, brightness, response time, and appearance across the vehicle, especially when converting from incandescent bulbs to LEDs.

Not always. Some 7440 and 7443 LEDs include built-in load resistance or CANbus circuitry designed to help prevent hyperflash and bulb-out warnings. Other vehicles may still require an external resistor or decoder because monitoring sensitivity varies by electrical system.

No. They are similar dual-intensity wedge bulbs, but their electrical specifications can differ. A 7444 may have different wattage or output characteristics from a 7443, so they should not be assumed interchangeable without confirming the vehicle's original bulb specification and socket requirements.

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