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3425 36 mm Festoon LED Bulbs

Upgrade your vehicle's interior and license plate lighting with 3425 36 mm festoon LED bulbs. Designed for dome, map, glove-box, door courtesy, and compatible license plate applications, these 12V LED replacements provide brighter illumination with lower power consumption than traditional incandescent festoon bulbs.
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3425 36 mm Festoon LED Replacement Bulbs for Dome, Map & Plate Lighting

The 3425 bulb is a 36 mm festoon-style interior automotive bulb (C5W format) widely used in dome lights, map lights, glove-box lights, door courtesy lamps, and license-plate illumination across many European and Japanese vehicles. It installs using bullet-style festoon end caps that seat into spring-clip festoon sockets, making exact 36 mm length compatibility essential for electrical contact and retention.

This Underground Lighting collection contains 3425 LED replacement bulbs, upgrading the original ~5 W incandescent festoon to a 12 V solid-state LED system. Light is produced via surface-mount diode (SMD) arrays such as 5050, 2835, or COB layouts, typically consuming ~1–2.5 W while producing significantly higher brightness and lower heat than filament bulbs. Proper sizing is critical: 3425 = 36 mm, and it is not interchangeable with 31 mm, 38 mm, or 42 mm festoon bulbs.

3425 36 mm 6-SMD Festoon Style LED Bulbs

Medium-output 36 mm festoon LED using a multi-chip SMD layout for wide interior illumination. Suitable for dome, map, door, and plate lighting where exact 36 mm fitment is required.

Typical LED output for 3425 festoon bulbs ranges from approximately 80–250 lumens, depending on chip density and optics. Lower-output LEDs suit map and reading lights, while higher-output LEDs enhance dome, door, and plate visibility.

Functional Applications & Housing Compatibility

Dome / Cabin Light

Ceiling-mounted interior lighting requires broad beam spread to provide useful cabin illumination. A 3425 LED festoon bulb can increase interior brightness while offering the longer operating life associated with solid-state LED technology.

Map / Reading Light

Directed overhead illumination helps provide focused light for the driver or passenger. Diffused or moderate-lumen LEDs can improve visibility while helping reduce excessive glare in clear or transparent lenses.

Glove Box Light

Compact enclosed compartments benefit from improved illumination when accessing stored items. LED festoon bulbs can provide clearer lighting while producing less heat than traditional filament bulbs.

Door Courtesy Light

Lower door illumination helps improve entry visibility and ground awareness around the vehicle at night. A properly fitted 3425 LED can provide brighter and more efficient courtesy lighting.

License Plate Light

Exterior rear tag illumination generally requires white LED output, commonly around 5000–6000K, for clear plate visibility and compliance with applicable lighting requirements.

All bulbs mount via clip-in festoon sockets: compress one end into the spring clip and seat the opposite cap. Because festoon LEDs may be polarity-sensitive, rotate the bulb 180° if it does not illuminate unless the bulb uses non-polarity circuitry.

Exact Size & Cross-Fit Clarification

Festoon bulbs are length-specific and are not universally interchangeable:

  • 3425 = 36 mm
  • 6418 = 38 mm
  • 6411 / 578 = 42 mm
  • 31 mm festoon (e.g., 3175)

Even a 1–2 mm variation can cause loose contact or non-fitment in festoon housings. Always confirm the original bulb size before choosing a replacement.

LED Technology & Color Options

3425 festoon LED bulbs can use different LED layouts depending on the bulb design and desired output.

  • SMD layouts: 5050 / 2835 / COB
  • Chip count: Typically 4–8 for 36 mm festoon
  • Voltage: 12V DC automotive
  • Power draw: ~1–2.5W

Available LED Colors

  • Warm White (≈3000K): Comfortable, classic interior tone
  • Neutral White (≈5000K): OEM-style interior appearance
  • Cool White (≈6000K): Modern, crisp look
  • Blue / Red / Green: Accent or courtesy lighting

For exterior license plate positions, white LED output is the appropriate choice where required by applicable regulations.

Upgrade smarter with our all-in-one lighting collections designed for performance, safety, and style.

Browse Headlight Bulbs, Fog Light Bulbs, Brake/Tail Lights, Reverse Lights, and Switchback Turn Signal Bulbs for total road coverage.

Choose between powerful HID systems or energy-efficient LED upgrades.

Add finishing touches with LED Strobes, Rolls, Rock Lights, Underground Lights, and Interior Kits.

Confirm your vehicle fitment using the Bulb Finder and shop with confidence today.

Why Choose Underground Lighting 3425 36 mm LED Festoon Bulb Upgrades?

  • 2–4× Brighter Interior Illumination

    Underground Lighting 3425 LED festoon bulbs produce approximately 80–250 lumens versus roughly 40–70 lumens from traditional incandescent bulbs, helping improve visibility throughout the cabin and enclosed compartments.

  • Up to 70% Lower Power Consumption

    Underground Lighting LED festoon bulbs draw approximately 1–2.5W compared with around 5W for incandescent bulbs, reducing electrical load on interior lighting circuits.

  • Minimal Heat Protects Lenses & Housings

    Underground Lighting LED festoon bulbs operate with lower heat output than filament bulbs, helping reduce thermal stress on plastic lenses and enclosed dome or glove-box fixtures.

  • Exact 36 mm Festoon Fitment Stability

    Underground Lighting 3425 festoon bulbs follow the exact 36 mm size specification, helping maintain secure spring-clip contact and reducing flickering or intermittent connections caused by incorrect bulb lengths.

  • Long LED Lifespan (20,000–50,000 Hours)

    Underground Lighting solid-state festoon LEDs can provide a much longer operating life than traditional filament bulbs, helping reduce replacement frequency and interior lighting maintenance.

  • Flexible Interior Styling & Legal Plate Use

    Underground Lighting offers multiple LED color options for interior customization, while white LED options are suitable for compatible license plate applications where white illumination is required.

How to Choose the Right 9005 Headlight Bulb

Confirm your vehicle uses a 9005 / HB3 bulb, then choose the lighting technology and color that match your setup.

  • Choose LED, HID, or halogen: Match the bulb type to your current system and upgrade needs.
  • Pick the color temperature: Select the white, yellow, or blue-toned option that suits your preference.
  • Check vehicle fitment: Use the Vehicle Finder to confirm 9005 compatibility.
  • Match your existing system: Use HID replacement bulbs for an existing HID setup, or a complete conversion kit when upgrading from halogen.

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

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3425 36mm LED Bulb FAQs

A 3425 LED bulb is often installed in 36mm festoon fixtures such as dome lamps, map lights, glove-box lights, door courtesy lights, cargo lamps, and license plate housings. The applications vary depending on the vehicle and factory bulb specification.

The 3425 36mm 6-SMD Festoon Style LED bulb costs $10.00 each. It is available in multiple colors and is designed as a direct replacement for compatible 36mm festoon bulbs. The price of 3425 36mm LED bulbs also varies by brand and bulb design.

Yes, a 3425 bulb is commonly a 36 mm festoon-style bulb, but the terms aren't exactly interchangeable. 3425 is the fitment number. 36 mm is the bulb's approximate length, while festoon refers to the shape and style. The safest method is to confirm both the original bulb number and the physical length.

No, not if the socket is designed for a different festoon length. A shorter bulb may make poor electrical contact, while a longer bulb may not fit or may place too much pressure on the socket. Match the original festoon length before installation.

Yes, provided the vehicle uses a compatible 36mm festoon socket. Moderate-output LEDs are often better for map and reading lights, while brighter options work well for dome or cabin lighting.

Yes, if the license plate housing uses a 36mm festoon bulb and the LED color meets the applicable requirements for plate illumination. White is generally the appropriate choice for this application.

Some festoon LEDs are polarity-sensitive. Remove the bulb, rotate it 180°, check the festoon length, check the socket contacts, check the fuse, test the original bulb, and reinstall it. Also check that both metal end caps are seated firmly against the socket contacts and that the bulb length matches the holder correctly.

Many 3425 LED replacements can provide brighter or more efficient illumination than incandescent bulbs, but brightness depends on LED design and lumen output.

Yes. LED festoon bulbs generally use less electrical power than incandescent bulbs because LEDs convert more of the electric energy into light rather than filament heat. The exact power draw depends on the bulb design.

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