Hella PRO 5NM Masthead Heavy Duty Black Shroud Lens

The Hella Marine NaviLED PRO 5NM Masthead Lamp draws 4 watts in a heavy-duty black shroud, rated for 5 nautical mile visibility.

Five nautical miles at 4 watts is the figure worth understanding, since a filament masthead lamp at that range draws far more. A draw of 0.33 amps at 12V, or 0.17 at 24V, means a masthead light can run all night on a modest bank, which matters on a boat under sail with no engine charging.

Having no filament makes it shock and vibration proof, which is the other half of the argument. A masthead is the worst place on a boat for vibration and the hardest to reach for a bulb change, and a filament lamp fails there more often than anywhere else.

The heavy-duty black shroud form is proven across commercial, military and recreational vessels. Five nautical mile visibility is the requirement for larger vessels, so the range rating needs matching to the boat's length rather than chosen by preference. Explore more navigation lights.

• 5NM visibility at 4 watts
• 0.33A at 12V, so it runs all night on a modest bank
• No filament to break at the worst place for vibration
• Match the NM rating to the boat's length