The 57 bulb (BA9s miniature bayonet base) is a compact 12 V automotive bulb (~4–5 W halogen) widely installed in instrument clusters, license-plate lights, side markers, glove-box lights, dome/map lights, and European interior lamps. Known interchangeably as BA9s, H6W, 1895, and 64113, it uses a push-and-twist bayonet base with dual side pins that lock into a dedicated BA9s socket—not interchangeable with T10 wedge style festoon bulbs.
- Bulb type: 57 / BA9s / H6W / 1895 / 64113
- Base: BA9s miniature bayonet (twist-lock)
- Voltage: 12 V DC automotive
- Halogen power: ~4–5 W
- LED power: 0.5–2 W
- Brightness: 50–250 lumens
- Beam: 360° omnidirectional (side + tip LEDs)
- Chip types: 5050 / 2835 SMD / COB
- Colors: 3000 K, 5000 K, 6000 K, amber, red
- CANbus: optional integrated resistor
This Underground Lighting collection upgrades standard 57 halogen bulbs to BA9s LED replacements (0.5–2 W) using 360-degree SMD LED arrays that maintain omnidirectional illumination in reflector housings. Compared with filament bulbs (~40–60 lm), BA9s LEDs deliver 50–250 lumens, cooler operation, and 10×–20× longer lifespan while preserving plug-and-twist installation in OEM lamp holders.
The collection includes:
- 360-Degree Shine 5-SMD BA9s LED Bulbs (PAIR)
360° multi-chip BA9s LED for instrument, dome, and marker lighting requiring uniform radial output.
Output: crisp white; compact body for tight Euro housings.
- 5-SMD BA9s CANbus Error-Free LED Bulbs (PAIR)
Integrated-resistor BA9s LED preventing bulb-out warnings in CANbus-monitored circuits such as license-plate or side-marker lamps.
Output: 6000 K white; error-free performance.
Primary Automotive Applications of 57 / BA9s LED Bulbs
1. Instrument Cluster & Gauge Backlighting
BA9s bulbs illuminate speedometer and dash panels. 360° LEDs maintain reflector fill and even gauge illumination without filament hot spots.
2. License Plate Illumination
White BA9s bulbs provide legal rear-plate lighting in many European vehicles. LED upgrades improve clarity and reduce heat near plastic housings.
3. Side Marker / Corner Lights
Amber or red BA9s markers enhance vehicle side visibility. LEDs deliver faster illumination and sharper color saturation.
4. Glove Box & Courtesy Lights
Small compartments using BA9s sockets benefit from brighter LED output and reduced heat buildup.
5. Dome / Map Lights (EU Models)
Certain European interiors use BA9's dome lamps. 360° LEDs ensure the reflector-based ceiling light spreads evenly.
Installation & Fitment
- Push-insert and twist-lock base
- Fits BA9s sockets only
- Polarity-sensitive unless a non-polar LED
- Short-body LEDs fit tight clusters
- 360° LEDs maintain reflector optics
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