This collection focuses on the 561 automotive replacement bulb, which is commonly used in interior dome lights, map lights, cargo/trunk illumination, and license plate lighting. The 561 format uses a hook-style clip-in connector, shared with several interchangeable interior bulb sizes, including 562, 564, 567, 570, that often fit 44mm fixtures since these bulbs share the same base and brightness selection. This 561 collection by Underground Lighting upgrades the original ~5 W halogen hook style bulb to a solid-state LED light source that delivers the output of 80-300 Lumens. LED illumination is generated through electroluminescence in SMD (surface-mounted diode) chips, delivering higher brightness with dramatically lower heat output and power draw. Typical LED consumption is ~1–3 W, reducing electrical load in interior circuits and battery-dependent systems such as RVs, trailers, and off-grid vehicles.
- LED type: 8-SMD array
- Voltage: 12 V DC
- Output: ~150–250 lumens
- Colors: White, Amber, Blue, Red, Green
- Application: Dome, map, cargo, plate, RV interior
- Install: Clip-in festoon mount
This collection includes 561 44 mm 8-SMD LED bulbs available in multiple color options:
- 6000 K White – crisp cabin and license plate illumination
- Warm Amber (~3000 K) – comfortable interior lighting
- Blue / Red / Green – decorative or accent interior use
Typical LED output ranges ~80–300 lumens, depending on chip count and configuration. Lower-lumen LEDs (~100 lm) are suitable for map lights, while higher-output LEDs improve visibility in cargo, trunk, and utility areas.
Functional Applications & Housing Compatibility
Interior Dome Light:
Ceiling-mounted cabin lighting requires wide, diffused illumination. LED reduces glare and heat in enclosed plastic lenses.
Map / Reading Light:
Localised front-seat illumination where LED brightness should remain moderate to avoid hotspot glare.
Cargo / Trunk Light:
Utility lighting in rear storage areas. Higher-output SMD LEDs improve night loading visibility.
License Plate Light:
Rear plate illumination is required by law. Must use white LED for regulatory compliance.
RV / Trailer Fixtures:
Interior and bay lighting in 12 V auxiliary systems. LED reduces battery consumption and heat buildup.
All bulbs are installed using plug-and-play insertion into hook-style sockets. Because LED polarity matters, the bulb may be flipped 180° if it does not illuminate unless it is designed with non-polarity circuitry.
Thus, LED replacements allow brightness tuning without a socket change.
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