The 6418 bulb is a 38 mm festoon-style interior automotive bulb (C10W format) widely used in dome lights, glove box lights, map lights, footwell illumination, and license-plate lighting across many European and Japanese vehicles. It installs via bullet-shaped metal end caps that seat into spring-loaded festoon clip sockets, making exact 38 mm length compatibility critical for electrical contact and retention.
SMD chip types: 2835 / 5050
Chip count: typically 3–6 for 38 mm festoon
Voltage: 12 V DC automotive
Power draw: ~1–2 W
This Underground Lighting collection contains 6418 LED replacement bulbs, upgrading the original ~5 W incandescent festoon to a solid-state LED lighting system operating on the standard 12 V DC automotive electrical circuit. LED festoon bulbs use surface-mount diode (SMD) chips such as 2835 or 5050 packages, delivering higher brightness while drawing only ~1–2 W and producing minimal heat compared with filament bulbs.
The collection includes the core product:
- 6418 38 mm 3-SMD CANbus Error-Free Festoon LED Bulbs
Compact 38 mm LED festoon with integrated CANbus load circuitry to prevent bulb-out warnings in license-plate or door-monitored lighting circuits. Designed for precise 38 mm housings and interior applications requiring stable output and low heat.
Typical LED output for 6418 festoon bulbs ranges ~80–220 lumens, depending on chip density and optical spread. Lower-output LEDs are recommended for map or glove-box lighting, while higher-output LEDs improve dome or footwell visibility.
Functional Applications & Housing Compatibility
Dome / Cabin Light
Ceiling-mounted interior lighting requiring a wide beam spread. LED upgrades increase cabin brightness and longevity.
Glove Box Light
Small enclosed compartment light. LED festoon improves reach and clarity with lower heat buildup.
License Plate Light
Exterior rear plate illumination requiring white LED output (≈5000–6000 K) for regulatory compliance. CANbus festoon LEDs prevent dashboard bulb-out warnings.
Footwell / Courtesy Light
Under-dash or door-mounted lighting enhances entry visibility and interior styling.
Map / Reading Light
Directed overhead light for driver/passenger. Diffused or lower-lumen LED reduces glare in clear lenses.
All 6418 bulbs are installed using clip-in festoon mounting: compress one end into the spring clip and seat the opposite cap. Because festoon LEDs can 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:
- 6418 = 38 mm
- 6413 = 36 mm
- 6411 / 578 = 42 mm
- 212-2 = 44 mm
Even 2 mm variation can cause loose contact or non-fitment in festoon housings.
LED Technology & Color Options
Available LED color temperatures:
- Warm white (≈3000 K) – comfort / classic interior tone
- Neutral white (≈5000 K) – balanced OEM look
- Cool white (≈6000 K) – modern crisp illumination
Exterior license plate use requires white only.
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