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LED Turn Signal Bulbs & Indicator Light Bulbs

Shop LED turn signal bulbs for front and rear blinkers, brake/turn signal positions, and indicator lights on cars, trucks, and SUVs. Find amber, red, switchback, CANbus-ready, and built-in-resistor options in popular sizes such as 1156, 1157, 3157, 7443, 4257, and 7507.

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With a 4.95 average rating across Google and Judge.me, Underground Lighting has earned the trust of drivers looking for dependable LED lighting upgrades. See why customers choose us for fitment support, quality products, fast shipping, and brighter lighting solutions for cars, trucks, and SUVs.

LED Turn Signal, Brake & Taillight Bulbs for Trucks and SUVs

Underground Lighting’s LED turn signal, brake, and taillight bulb collection is designed for front indicators, rear linkers, brake/turn-signal positions, and taillight upgrades on cars, SUVs, and full-size trucks. LED signal bulbs light up instantly and produce sharper, more consistent light output than halogen bulbs. As a result, visibility improves, which makes your vehicle easier to notice during turns, lane changes, braking, merging, and risky signaling. Many drivers also choose them for their cleaner lighting, modern styling, and longer life performance. 

Underground Lighting offers front, rear, and vehicle-specific LED turn signal bulbs for popular trucks such as the Chevrolet Silverado, GMC Sierra, Ford F-Series, F-150, and F-250. Options are available for front turn signals, rear turn signals, brake/turn-signal combinations, and brake/taillight positions.

Supported bulb sizes include 3156, 3157, 7440, 7443, 7444, 1156, 1157, PY21W / 7507, WT21W / 4257, and related variants. These options cover both single-function and dual-function lighting setups, depending on the vehicle’s factory socket and rear lighting design.

Some vehicles may experience hyperflash, fast blinking, or dashboard bulb warnings after switching from halogen to LED. To fix these issues, Underground Lighting offers CANbus-compatible and built-in-resistor LED turn signal bulbs designed to deliver clean, more stable signal operation across many applications. For extra load correction, you can also explore our LED resistors and decoders.

When it comes to color, front and rear turn signal bulbs commonly use amber, while rear brake and taillight applications typically require red when matched to the correct housing and lens. Choosing the right bulb color, socket type, and function helps ensure a better fit and more reliable lighting performance.

Need expert guidance before upgrading? Contact Underground Lighting’s experts for help finding the right bulb size and fitment for your vehicle.

Why Choose Underground Lighting LED Turn Signal Bulbs

  • Faster Illumination Improves Reaction Time

    Underground Lighting LED turn signal and brake bulbs light up quickly, helping your signals appear faster than traditional halogen bulbs with filament delay. This gives your vehicle a sharper, more noticeable response during braking, lane changes, and hazard signaling.

  • Clear Amber & Red Output for Legal Compliance

    LED turn signal bulbs produce clear amber, and red LED brake/tail light bulbs remain highly visible in bright daylight, low-light conditions, and heavy traffic. Using the correct signal color helps other drivers recognize your intentions more easily while supporting proper signaling and legal road compliance for front and rear turn signal applications

  • Wide Visibility Angle Enhances Signaling

    Underground Lighting LED signal bulbs are selected to support strong visibility from multiple angles, including the front, rear, and side of the vehicle. This helps other drivers notice your turn signals, brake lights, and hazard lights more clearly during everyday driving, whether in the day or at night.

  • CANbus Error-Free Operation Prevents Hyperflash

    Underground Lighting carries CANbus-compatible, built-in-resistor LED bulbs that help to reduce hyperflash, fast blinking, and dashboard warning issues that usually occur when switching from halogen to LED. These options help create a smoother, more stable signal upgrade.

  • 25,000–50,000+ Hour Service Life

    Each LED brake, tail, and turn signal bulb designed by Underground Lighting delivers lasting performance, consistent brightness, and lower replacement needs compared to standard halogen bulbs.

  • Improved Styling Without Sacrificing Function & Weather Resistance

    Our LED options help drivers achieve a cleaner, more modern appearance while ensuring the right bulb color, proper fitment, and consistent signal operation. They are selected for cars, SUVs, and trucks that require both updated styling and dependable lighting performance.

How to Find Out Which Replacement Turn Signal Bulb Your Vehicle Needs?

To find out which turn signal bulb your vehicle needs, first check your owner's manual, as it usually lists the correct bulb size and specifications for both the front and rear turn signals. 

Check your bulb number in three quick steps:

  1. Locate your current turn signal bulb, carefully remove it from the housing, and check the part number on its base. Common bulb sizes are 1156, 1157, 7440, 7443, 3157, and 3156. Each type has specific base configurations and electrical requirements that must match your vehicle's specifications.
  2. To find the exact fitment, enter your vehicle's year, make, and model into our fitment finder tool to verify which bulb you need. You can also check the maintenance section in your owner's manual.
  3. Choose the right LED turn signal bulb or LED brake light bulb with confidence. Here at Underground Lighting, our fit guarantee ensures you'll receive the correct bulb that perfectly matches your vehicle's specifications.

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

Looking for LED turn signal bulbs​ for your specific make and model? Our lighting experts are here to help.

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LED Turn Signal Bulbs FAQs

Not always. But some vehicles, particularly those having a factory halogen flasher system, may need resistors. LED bulbs draw less power than halogen bulbs, so the vehicle might think the bulb is out and cause hyperflash or rapid blinking. Built-in resistor or CANbus-ready LED turn-signal bulbs can help reduce these issues.

Fast blinking, also known as hyperflash, usually occurs when your vehicle detects lower electrical resistance after you replace halogen bulbs with LED turn-signal bulbs. This is common with front and rear blinker upgrades because LEDs draw significantly less power than traditional bulbs. To fix these issues, a load-corrected bulb or an LED bulb with built-in resistors and decoders may be needed.

Most turn signal applications use amber LED bulbs. If your vehicle has a clear front or rear turn signal lens, amber output is usually required. If the lens is already amber, you should still use the correct bulb color for your application. Rear brake and taillight bulbs are usually red LEDs.

Amber LED bulbs are used only for turn-signal or indicator functions and emit amber light when activated. Switchback LED bulbs provide dual functionality by producing white light for parking lights or daytime running lights and automatically switching to amber when the turn signal is activated. Always confirm your vehicle supports the switchback function before ordering.

Yes, LED turn signal bulbs can be used in front and rear signal positions as long as the bulb size, color, socket type, and function match your vehicle. Some vehicles may need CANbus-ready bulbs or resistors when LEDs are installed in front or rear blinker locations.

In most cases, yes. “Indicator bulb,” “turn signal bulb,” “blinker bulb,” and “directional bulb” are often used interchangeably to refer to the same type of signal light. The important part is matching the correct bulb size, color, and socket style for your vehicle.

Check the part number printed on your current bulb, look in your owner’s manual, or enter your vehicle year, make, and model in any vehicle fitment check tool to confirm fitment. Common LED turn signal bulb sizes include 1156, 1157, 3156, 3157, 7440, 7443, 4257, and 7507.

The main difference between the 3156 and 3157 LED bulbs is that a 3156 bulb is usually single-function, while a 3157 bulb is commonly dual-function. A single-function bulb may be used for one lighting function, such as a turn signal. A dual-function bulb may support two functions, such as parking light and turn signal, or brake and turn signal. Always match the bulb to your factory socket.

The main difference between the 7440 and 7443 LED bulbs is their circuit design and functionality. A 7440 bulb is generally a single-filament bulb that operates at one brightness level and is commonly used for turn signals or reverse lights, while a 7443 bulb is commonly dual-function, providing both dim and bright light. It is suitable for applications that require both lighting functions, such as taillights and brake lights. 

An 1156 LED bulb is usually single-contact and single-function. An 1157 LED bulb is typically dual-contact and dual-function. They are not always interchangeable because the base contacts and lighting functions are different. Use the bulb size listed for your exact vehicle application.

They may cause a dashboard warning on some vehicles. Since LEDs use less power than halogen bulbs, the vehicle may trigger a bulb-out warning or rapid blinking. If your vehicle is sensitive to LED upgrades, choose CANbus-compatible bulbs with built-in resistors, or add the correct LED resistors and decoders.

Yes, many LED turn signal bulbs are designed to replace factory halogen bulbs in the original housing. The only thing to ensure is the correct bulb size, socket type, color, and electrical compatibility. Some vehicles may need built-in resistors or CANbus-ready bulbs for proper function.

Many LED turn signal bulbs are plug-and-play, but not all vehicles respond the same way. Some cars and trucks may require CANbus-compatible bulbs, built-in resistors, or extra decoders to prevent hyperflash, dashboard warnings, or irregular blinking.

LED turn signal bulbs usually cost between $39.99 and $69.99 per pair, depending on bulb size, vehicle fitment, color, and built-in features. Basic LED taillight or indicator bulbs may cost less, while CANbus-ready, no-hyperflash, or built-in-resistor LED turn signal bulbs are usually priced higher.

Price may vary depending on the socket type, front or rear position, single-function vs. dual-function design, and whether the bulb is designed for a specific truck application, such as Ford F-Series, Chevrolet Silverado, or GMC Sierra. Amber, red, white, and switchback LED bulbs may also vary in price depending on their output and functionality.

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