Systems
Lighting
Navigation, interior and underwater light.
Lighting is one of the few systems that is both a legal requirement and a design decision. It also runs longest exactly when the engine is off and the bank is on its own.
Lighting is really four systems that happen to share a battery.
Treating them as one system rather than four separate purchases is what keeps current draw, switching and helm control coherent.
Navigation lights — Governed by the collision regulations, which define the sectors, arcs and visibility ranges required for a vessel of your length and type — specified to comply, not to look good.
Interior and deck lighting — Decides how a space feels after dark, and how much current is quietly disappearing while you sleep.
Underwater lighting — A discipline of its own, where sealing, corrosion resistance and getting heat out into the water matter more than anything you would consider above the waterline.
Dimming and control — The layer that ties every light into the electrical system — how it is switched, grouped and dimmed from the helm and the saloon.
Almost everything is LED now, so the conversation has moved from wattage to current draw, heat and how long the fixture lasts.
Low draw matters most on boats and overland builds running for days off a limited bank, where lighting is competing with the fridge, the electronics and everything else.
Sealing and material choice — expressed as IP ratings and housing specification — decide whether a fixture survives spray, washdown and salt air or corrodes quietly behind its lens.
Control is the layer that gets forgotten and pays back the most.
Dimming preserves night vision at the helm and cuts draw at the same time. Integrating lighting with the vessel's switching — conventional circuits or a digital control system — determines how it is actually operated, and bringing lighting onto a digital backbone makes scenes and zones practical.
Decide all of that before cable is pulled, because retrofitting control onto fixtures that were never wired for it costs several times what it costs to design in.
A coherent set, engineered for vibration, moisture and salt — so colour temperature, control compatibility and switching behave consistently everywhere on board.
What to get right
- Specify navigation lights to the vessel's length and type so the sectors, arcs and visibility ranges meet the collision regulations. This is a compliance decision, not a styling one, and it gets settled first.
- Budget current draw across the whole boat, not fixture by fixture. Add up interior, deck and underwater loads against your bank and your charging, because lighting runs longest when the engine and alternator are off.
- Choose IP rating and housing material by location. Underwater fixtures face permanent immersion, deck fixtures face spray and washdown, and interior fittings still live in humidity and salt air.
- Decide dimming and control before the cable is run. Whether lighting is switched conventionally or brought onto a digital backbone changes the wiring, and adding control later to fixtures that were not wired for it is expensive.
- Specify across a coherent set — Hella Marine, OceanLED and SES Services — so colour temperature, control compatibility and switching behave consistently everywhere on board.
What this covers
- LED navigation lights
- Interior & deck lighting
- Underwater lighting
- Dimmers & lighting control
Representative products
LED navigation lights
Hella Marine NaviLED PRO Navigation Light
The Hella Marine NaviLED PRO is a "Fit and Forget" LED navigation light engineered for long, maintenance-free service in the marine environment.
Underwater lighting
OceanLED Sport Underwater Light
The OceanLED Sport is a high-output underwater marine light that transforms a vessel’s presence at anchor with durable, energy-efficient illumination.
Frequently asked questions
How do I choose the right navigation lights?
By vessel length and type. The collision regulations define the light sectors, arcs and visibility ranges required for each class of craft, so confirm what applies to your vessel first and then specify fixtures that meet it. It is a compliance requirement, not a matter of appearance.
Why does current draw matter so much for lighting?
Because lighting runs off the battery, usually for the longest stretch of the day when the engine is off. It competes directly with the fridge, the electronics and the pumps, so low draw translates straight into more hours before you need to charge. LEDs help enormously, but the total load across interior, deck and underwater fixtures still has to be budgeted against your bank.
What should I look for in underwater lighting?
Sealing, corrosion-resistant materials and thermal management, alongside output. An underwater fixture is permanently immersed and has to dump its heat into the surrounding water, so it is engineered differently from anything above the waterline and should be specified separately.
Can lighting be dimmed and controlled from one system?
Yes. Dimming preserves night vision and cuts draw, and lighting can be integrated with the vessel's switching, including digital control systems that allow scenes and zones. The key is deciding the control approach before cable is run, because adding control later to fixtures that were not wired for it is far more difficult and costly than designing it in.