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3175 31mm Interior LEDs Lights

Upgrade compact interior lighting positions with Underground Lighting’s 3175 31mm festoon LED bulbs. Designed for vanity mirrors, map lights, glove-box lights, dome lights and other tight housings, these low-power LED replacements provide brighter illumination, lower heat and multiple color options while retaining the factory-style 31mm festoon fitment.
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3175 31mm Festoon LED Replacement Bulbs for Vanity, Map & Interior Lights

The 3175 bulb is a 31 mm festoon-style miniature interior automotive bulb commonly installed in vanity mirror lights, map lights, glove-box lamps, dome lights, license-plate lights, and footwell accent fixtures.

It uses bullet-style festoon clip ends that seat into spring-loaded 31 mm festoon sockets, making exact 31 mm length compatibility critical for electrical contact and mechanical stability in tight housings such as sun visors and console lids.

Electrical & Lighting Specifications

  • Voltage: 12V DC automotive system
  • Power draw: Approximately 0.5–2W, compared with approximately 3–5W halogen
  • LED types: SMD 2835 / 5050 or COB
  • Brightness: Approximately 60–200 lumens
  • Polarity: Directional unless using non-polar circuitry
  • Heat: Near-zero compared with filament bulbs

Some variants include CANBus resistor circuitry, useful when installed in license-plate or BCM-monitored circuits to help prevent bulb-out warnings or flicker.

This Underground Lighting collection includes 3175 LED replacement bulbs, upgrading the original approximately 3–5W incandescent festoon to a 12V solid-state LED system consuming only approximately 0.5–2W.

LED light is produced through surface-mount diode arrays, delivering approximately 60–200 lumens depending on chip density and optical spread. Compared with filament bulbs, 3175 LED festoons produce higher brightness, dramatically lower heat, and a potential 20,000–50,000-hour lifespan.

This Collection Contains

3175 31mm 6-SMD Festoon LED Bulb

Higher-output 31 mm festoon LED using a multi-chip SMD layout for dome, plate, and glove-box lighting where stronger illumination is required.

3175 31mm 4-SMD Festoon LED Bulb

Moderate-output compact festoon LED optimized for vanity mirrors, map lights, and low-clearance housings requiring controlled brightness.

Available colors include white, blue, red, and green for interior styling, while approximately 5000–6000K white is recommended for compatible license-plate positions to meet road-use requirements.

Primary Functional Applications & Fitment

Vanity Mirror Light

Compact directional lighting in visor housings with very limited clearance. 31 mm festoon LEDs provide brighter reflection visibility with minimal heat near fabric and plastic trim.

Map / Reading Light

Overhead personal illumination requiring soft-focus output. Lower-lumen or diffused SMD/COB LEDs can reduce glare in clear lenses.

Glove Box / Console Light

Small compartment lighting that improves nighttime access. LED output increases clarity while reducing heat inside enclosed housings.

Dome / Cabin Accent Light

Secondary interior illumination zones using miniature festoons. LED upgrades can enhance overall cabin brightness.

Footwell / Ambient Lighting

Under-dash or accent lighting using colored LEDs such as blue, red or green for styling and visibility.

License Plate Light

Exterior rear-tag illumination requiring white LED output, typically around 5000–6000K, for compliant plate visibility.

Exact Size & Cross-Compatibility Clarification

Festoon bulbs are strictly length-specific:

  • 3175: 31 mm
  • 3425: 36 mm
  • 6418: 38 mm
  • 6411 / 578: 42 mm

Even a 2–3 mm mismatch can prevent secure seating or create excessive tension in festoon clips.

The 3175 is also not interchangeable with wedge bulbs such as 194/168/2825 because they use completely different base designs.

Explore professional automotive lighting, including HID, LED, forward lighting, and auxiliary lighting.

From headlights and fog lights to brakes, reverse, and switchback signals, we offer total lighting coverage.

Interior light kits, rock lights, and underglow create custom vehicle presence and verify compatibility with our Bulb Finder.

Why Choose Underground Lighting 3175 31mm LED Festoon Bulb Upgrades?

  • Compact 31mm Fit for Tight Interior Housings

    Underground Lighting 3175 bulbs are designed for narrow festoon sockets in vanity mirrors, consoles, and small fixtures where longer festoon sizes may not fit.

  • 2–3× Brighter Illumination in Small Spaces

    Underground Lighting 3175 LED festoons produce approximately 60–200 lumens, helping improve mirror, map, and compartment visibility over standard filament bulbs.

  • Ultra-Low Heat Near Fabric & Plastic

    Underground Lighting LED festoon bulbs operate at a cooler temperature than traditional filament bulbs, helping reduce heat exposure around visors, headliners, console trim, and plastic housings.

  • Up to 90% Lower Power Consumption

    Underground Lighting 3175 LEDs typically use approximately 0.5–2W, reducing battery and electrical demand in frequently used interior and accessory lighting circuits.

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

    Underground Lighting’s solid-state LED construction eliminates fragile filaments and is designed to reduce the replacement frequency in interior lighting applications.

  • Flexible Interior Styling & Legal Plate Use

    Underground Lighting offers multiple color options for cabin accent lighting, while white LED options provide the appropriate output for compatible license plate applications.

How to Choose the Best 3175 Bulb

  • Start by confirming that the original festoon bulb measures 31mm from end cap to end cap.
  • Choose the 6-SMD bulb when stronger illumination is needed in a dome light, glove box, or license plate housing. The 4-SMD version is better suited to vanity mirrors, map lights, and compact fixtures where softer output helps reduce glare.
  • Select white for practical illumination, or one of the available accent colors to match your interior styling. Also check housing clearance and bulb polarity before completing the installation.

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

Need 31mm LED Bulbs for Your Specific Make and Model?

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3175 31mm Festoon LED Bulb FAQs

A 3175 LED bulb is commonly used in compact 31mm festoon sockets for vanity mirrors, map lights, glove boxes, dome lights, footwell lighting, license plate lights, and other small interior or auxiliary fixtures. The exact application depends on the vehicle and factory bulb specification.

3175 31mm LED bulbs typically cost around $5 to $15 per bulb, depending on LED count, brightness, color, chip design, construction quality, and package quantity. Lower-output bulbs for vanity or map lights are usually less expensive, while brighter multi-SMD versions may cost more.

A 3175 bulb commonly refers to a 31mm festoon-style automotive bulb, but bulb numbering can vary between manufacturers and cross-reference systems. For accurate fitment, confirm both the original bulb number and the physical length from metal end cap to metal end cap.

No, not in a socket designed specifically for a 36mm bulb. Festoon bulbs are length-sensitive, and a 31mm bulb may be too short to maintain secure electrical contact in a 36mm holder. The replacement should match the original bulb length and socket specification.

Choose the 4-SMD option for compact fixtures such as vanity mirrors, map lights, or other positions where moderate illumination is preferred. The 6-SMD option is better suited to applications that need stronger light output, such as dome, glove-box, or license plate lighting. Actual brightness depends on the LED chips and bulb design, not SMD count alone.

Some 3175 festoon LEDs are polarity-sensitive. If the bulb does not illuminate, remove it, rotate it 180 degrees, and reinstall it. Also confirm that both metal end caps are seated firmly against the socket contacts and that the bulb matches the required 31mm length.

Yes. You can use blue, red, and green 3175 LEDs in compatible interior accent-lighting positions, while white is generally better suited to functional lighting such as vanity, map, dome, glove-box, and license plate applications. Exterior lighting should always match the required vehicle function and applicable local rules.

Brightness varies by LED design and chip count. 3175 festoon LED bulbs can range from moderate-output bulbs for vanity and map lights to brighter versions for dome, glove-box, or license plate use. The live collection lists an approximate output range of 60 to 200 lumens, depending on the specific bulb design.

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