Marine LED Bulb Base Guide: How to choose the right model?

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Switching to LED lighting on a yacht is a strategic decision for autonomy. However, between technical codes like G4, MR16, or BAY15D, it's easy to get lost. At Lyvio Marine, we have selected the Dixplay range, a leader in high-performance LED lighting, to meet every specific onboard need. This guide helps you identify the base you need for your ceiling lights, reading lights, and navigation lights.

1. Pin Bases (Low Voltage): G4, MR11, and MR16

These models are the most common for interior lighting (recessed spots, reading lights).

G4 Base (The "Chips")

The absolute standard for small ceiling spots and cabin reading lights.

  • Identification: Two thin pins spaced 4 mm apart.

  • Usage: Replacement for halogen "capsule" bulbs. Available in round (disk) or cylindrical versions.

  • Dixplay Advantage: 360° or directional diffusion to avoid losing light in the back of the fixture.

MR11 and MR16 Bases (Reflector Spots):

  • MR11 (GU4): 35 mm diameter.

  • MR16 (GU5.3): 50 mm diameter.

  • Identification: They have two thicker pins than the G4.

  • Usage: Main lighting for the salon or cockpit. The reflector concentrates the light beam downwards.

2. Bayonet Bases: Security against vibrations

On a yacht, vibrations are constant. Bayonet bases are designed to stay locked thanks to their "push-and-twist" system.

  • BA15S and BA15D (15 mm Bases):

    • BA15S (S for Single): Single contact at the bottom, level pins. Often used for courtesy lighting or certain signaling lights.

    • BA15D (D for Double): Double contact at the bottom, level pins. Very common for older ceiling lights converted to LED.

  • BAY15D Base (The Navigation Light Standard):

    • Identification: Double contact at the bottom, but pay attention: the pins on the sides are offset in height.

    • Critical Usage: This is the standard base for navigation lights (bicolor, stern, masthead). The offset pins prevent the bulb from being mounted incorrectly, ensuring the colored sectors are perfectly aligned.

3. Why choose Dixplay LEDs for your Yacht?

Replacing a bulb with a standard supermarket LED is a mistake on a vessel. The Dixplay range meets three marine requirements:

  • Multi-voltage (10-30V): Charging batteries rise to 14.4V or 28.8V. Dixplay LEDs include a regulator to prevent burning out during voltage peaks.

  • No Interference (EMI): Low-end LEDs can disrupt your VHF or AIS. Dixplay is certified free of electromagnetic interference.

  • Corrosion Resistance: Components are treated to withstand salt air and bilge humidity.

Summary Table for Your Order

Base Type

Diameter / Spacing

Main Usage on the Yacht

G4

4 mm (pins)

Ceiling spots, cabin reading lights

MR11

35 mm (diameter)

Small recessed spots

MR16

50 mm (diameter)

Main lighting, salon, galley

BA15S

15 mm (bayonet)

Interior lighting, courtesy lights

BA15D

15 mm (bayonet)

Double contact ceiling lights

BAY15D

15 mm (offset pins)

Navigation lights (Mandatory)

Optimise your visual comfort Choosing the right Dixplay LED means ensuring stable, durable, and energy-efficient lighting. Whether you are looking for a Warm White (3000K) for a cozy atmosphere or a Neutral White (4000K) for your chart table, always check the base type before ordering.

Unsure about your installation? Take a photo of your current bulb and contact our technical service for immediate identification.