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.
The collection includes:
- 3425 36 mm 6-SMD Festoon Style LED Bulbs
Medium-output 36 mm festoon LED using 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 ~80–250 lumens depending on chip density and optics. Lower-output LEDs suit map/reading lights, while higher-output LEDs enhance dome, door, and plate visibility.
Functional Applications & Housing Compatibility
Dome / Cabin Light
Ceiling-mounted interior lighting requiring broad beam spread. 3425 LED festoon increases cabin brightness and longevity.
Map / Reading Light
Directed overhead illumination for driver or passenger. Diffused or moderate-lumen LEDs reduce glare in clear lenses.
Glove Box Light
Compact enclosed compartment lighting. LED festoon improves clarity and reduces heat buildup.
Door Courtesy Light
Lower door illumination enhancing entry visibility and ground awareness at night.
License Plate Light
Exterior rear tag illumination requiring white LED output (≈5000–6000 K) for legal compliance.
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 180° if not illuminated unless using non-polarity circuitry.
Exact Size & Cross-Fit Clarification
Festoon bulbs are length-specific and not interchangeable:
- 3425 = 36 mm
- 6418 = 38 mm
- 6411 / 578 = 42 mm
- 31 mm festoon (e.g., 3175)
Even 1–2 mm variation can cause loose contact or non-fitment in festoon housings.
LED Technology & Color Options
SMD layouts: 5050 / 2835 / COB
Chip count: typically 4–8 for 36 mm festoon
Voltage: 12 V DC automotive
Power draw: ~1–2.5 W
Available LED colors:
- Warm white (≈3000 K) – comfort / classic interior tone
- Neutral white (≈5000 K) – OEM-style interior
- Cool white (≈6000 K) – modern crisp look
- Blue / Red / Green – accent or courtesy lighting
Exterior license-plate positions require white LED only.
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