Why switch to LED on your boat
Lighting accounts for 10% to 20% of the electrical consumption on a recreational vessel. Replacing halogen or incandescent bulbs with LED reduces that consumption by up to 85%, which translates to longer-lasting batteries, less charging demand, and greater autonomy at anchor.
Beyond energy efficiency, LED bulbs generate far less heat (an important factor in tight spaces like cabins), have a lifespan of 30,000 to 50,000 hours compared to 1,000-2,000 for a halogen, and are more resistant to vibrations from the engine and waves.
Types of marine LED lighting
Interior lights
- Ceiling fixtures and downlights: replace overhead lights. Available in warm white (3,000K, cozier) and neutral white (4,000-4,500K, better visibility). Some models allow switching from white to red to preserve night vision
- Reading lights: adjustable lights for berths and the chart table. Look for models with dimming capability
- Flexible LED strips: perfect for ambient and indirect lighting. Install them under cabinets, along stringers, or on ceilings. Choose strips with IP65 protection or higher
- Courtesy lights: small recessed lights in steps, the cockpit, or passageways to illuminate walkways without glare
Navigation lights
Navigation lights are mandatory and regulated by the International Regulations for Preventing Collisions at Sea (COLREGS):
- Port (red) and starboard (green): visible at 1-2 nautical miles depending on vessel length
- Stern (white): visible from astern at 2 miles
- All-round (white): for anchoring, visible at 2 miles through 360 degrees
- Masthead (white): visible at 3-5 miles, mandatory when motoring
When replacing navigation lights with LED, make sure the manufacturer certifies they comply with COLREG standards for visibility angles, luminous range, and color. Not just any red or green LED will do.
Underwater lights
LED underwater lights are mounted on the transom or below the waterline and create a spectacular visual effect at night. In addition to aesthetics, they attract plankton and with it fish, making them popular on fishing boats.
They require installation with a watertight through-hull fitting and marinized wiring. The most popular colors are blue, white, and green.
Anchor and deck lights
- LED deck floods: illuminate the maneuvering area for nighttime docking
- Spreader lights (sailboats): mounted on the mast spreaders to illuminate the deck from above
- LED stern bar: illuminates the swim platform and dinghy access
How to choose the right LED bulbs
Color temperature
- 2,700-3,000K (warm white): cozy ambiance for saloons and cabins
- 4,000-4,500K (neutral white): good visibility for the galley, head, and engine room
- 6,000K+ (cool white): not recommended for interiors (harsh and unnatural light), but suitable for exterior work lights
Bases and formats
Marine LED bulbs most commonly replicate existing formats for direct replacement:
- G4 bi-pin: the most common base in boat ceiling fixtures. Directly replaces halogen G4 bulbs
- BA15s and BA15d: single or double bayonet, used in navigation lights and large fixtures
- Festoon (31mm, 36mm, 42mm): tubular, common in ceiling fixtures
- MR16 and GU10: directional spotlights
Voltage
Most recreational vessels operate on 12V DC. Make sure your LED bulbs are rated for 12V (not 230V or 110V AC). Some models accept a 10-30V range, which protects against the voltage fluctuations typical of marine electrical systems.
IP rating
- IP44: splash-proof, suitable for dry interiors
- IP65: jet-proof, required for exteriors and the head
- IP67: temporarily submersible, for exposed deck lights
- IP68: permanently submersible, mandatory for underwater lights
Step-by-step installation
1. Inventory your current lights
Walk through the entire boat and note each light point: bulb type, base, voltage, and location. This allows you to place a single order with all the LEDs you need.
2. Direct replacement
In most cases, simply remove the old bulb and insert the new LED. If the fixture uses a halogen transformer, remove it: LEDs run directly on 12V DC.
3. Watch the polarity
Unlike incandescent bulbs, LEDs have polarity. If an LED bulb does not light up when installed, flip it in the socket or reverse the wires. It will not be damaged by being connected in reverse; it simply will not light.
4. Dimming
If you want to dim your LED lights, you need a dimmer compatible with 12V LEDs. Dimmers designed for halogens can cause flickering or damage. Look for PWM (pulse-width modulation) dimmers specifically designed for LEDs.
5. Navigation lights: professional installation
Replacing navigation lights requires special attention. Verify that the LED navigation lights are certified for marine use and meet the specifications for your vessel's length. If in doubt, have a marine electrician handle the installation.
Consumption comparison: halogen vs LED
| Light point | Halogen | LED | Savings | |---|---|---|---| | Cabin fixture | 20W | 3W | 85% | | Reading light | 10W | 1.5W | 85% | | Navigation light | 25W | 3W | 88% | | Deck flood | 50W | 8W | 84% | | Total (10 lights) | ~200W | ~30W | 85% |
With 10 lights on for 5 hours a day: halogen consumes 1,000 Wh, LED only 150 Wh. On a 12V system, that is 83 Ah versus 12.5 Ah. The difference can eliminate the need for a generator or reduce the size of your solar panel installation.
Common mistakes when converting to LED
- Buying cheap LEDs without marine certification: they may fail due to moisture or vibrations. Invest in recognized brands (Hella Marine, Lopolight, Aqua Signal, Imtra)
- Ignoring color temperature: mixing cool and warm white in the same space looks bad and feels uncomfortable
- Not verifying navigation light certification: you may receive a fine during an inspection
- Forgetting ventilation: although LEDs generate little heat, in completely enclosed spaces they can overheat
- Using incompatible dimmers: causes annoying flickering and can reduce LED lifespan
Cost of the conversion
For a 30-40 foot boat with around 15-20 interior and exterior lights, the approximate cost of a full LED conversion is:
- Interior LED bulbs (15 units): 80-200 EUR
- Certified LED navigation lights: 150-400 EUR
- LED strips for ambient lighting: 30-80 EUR
- LED deck floods: 60-150 EUR
- Total: 320-830 EUR
The investment pays for itself in 1-2 seasons thanks to savings on generator fuel and reduced battery charging.
