Hella Marine MST3 Slim Strobe Lighthead, Red Light, 12-24V, IP67

Overview

The Hella Marine 358117121 is an MST3 Slim LED strobe lighthead that runs on 10-30 V DC and draws 3 W, making it a straightforward fit for both 12 V and 24 V onboard power.

It is a low-profile surface-mount warning light that uses three LEDs and supports multiple flash patterns, so you can set the signal behavior you want for a single light or a multi-light setup.

This is a good match for commercial and utility-focused boats that need a compact red warning signal on deck, on a hardtop, or along the hull sides where space is tight. Any rules around colored warning strobes vary by region and application, so placement and use should follow local requirements for your vessel.

Key features

• 10-30 V DC input supports 12 V and 24 V electrical systems
• Red MST3 Slim strobe lighthead with three LED emitters
• 12 user-selectable flash patterns, including a steady-on option, with memory recall at power-up
• Multiple units can be wired to flash in sync or in an alternating pattern
• IP67 protection for exterior mounting where spray, washdowns, and rain are expected
• Reverse polarity protection helps prevent damage from accidental wiring mistakes
• Weatherproof build that tolerates vibration on working boats and trailered setups

Installation and wiring

The lighthead mounts on a flat surface with a low profile, so it works well on tight mounting zones like transom corners, pilothouse sides, hardtop faces, and work decks. Plan your wire routing before final placement, since clean cable runs matter as much as the light location on a boat.

For best long-term results in saltwater environments, bring the wiring into a dry area or a protected chase, use tinned marine-grade conductors, and seal splices with adhesive-lined heat-shrink. Keep a little slack for service, add strain relief where the cable passes through panels, and protect the circuit with an appropriately sized fuse or breaker for the load.

Electrical and system integration

This lighthead is built for DC systems and is commonly integrated through a helm switch panel, an accessory relay, or a dedicated warning-light controller. If you are running multiple lightheads, route the wiring so they can be synchronized cleanly and so all units share a solid ground path to avoid intermittent operation.

Maintenance and care

Rinse salt residue off the lens and housing during routine washdowns, and check the wire exit point and connectors a couple of times per season. If you notice flicker or missed flashes, inspect grounding and any splices first, since most issues on boats come from corrosion or vibration at connections.

What’s included

• MST3 Slim strobe LED lighthead
• Mounting screws
• 3M mounting tape