Bi-Color, Tri-Color Bow & Steaming Lights

What Are Bi-Color, Tri-Color Bow & Steaming Lights?

Marine navigation lights are not optional equipment — they are a legal requirement for any vessel operating between sunset and sunrise or in conditions of reduced visibility. Among the most critical of these are bi-color, tri-color, and steaming lights, each serving a distinct role in communicating your vessel's position, heading, and status to other boaters.

A bi-color bow light combines red (port) and green (starboard) sidelights into a single fixture mounted on the bow's fore-aft centerline. Bi-color lights simplify installation and are a popular choice for smaller vessels. According to USCG regulations, power vessels less than 20 meters (65.7 ft) in length may substitute a single bi-color light for separate port and starboard sidelights, provided it projects the correct arcs of visibility.

A tri-color light, typically mounted at the masthead, combines a red port light, a green starboard light, and a white stern light all in one compact fixture. This setup is reserved for sailboats under sail — when the engine is running, a separate steaming (masthead) light must be used instead. The advantage of a tri-color configuration is that it consolidates three required lights into a single elevated unit, improving visibility to other mariners and reducing power draw.

A steaming light — also called a masthead light — is a forward-facing white light required on power-driven vessels and sailboats operating under engine power. It must be positioned above the sidelights and shine across a 225-degree forward arc, signaling to other vessels that your boat is underway under power.

Why Proper Navigation Lights Matter

Choosing the right light isn't just about avoiding a fine — it's about safety. Correctly displayed navigation lights tell other mariners which direction you are heading, whether you're under sail or power, and help prevent collisions in low-visibility conditions. Certification matters: always look for USCG-approved or ABYC-certified fixtures that meet color, intensity, and arc requirements. Modern LED options draw significantly less power than traditional incandescent bulbs, reducing strain on your vessel's electrical system during night passages.

Key Considerations When Shopping

• Vessel size and type: Regulations differ based on whether your boat is under 12 m, 20 m, or 50 m, and whether it is sail or power.
• Mounting style: Deck-mount, pole-mount, stowaway, and bulkhead configurations are all available to suit different hull and deck layouts.
• LED vs. incandescent: LED fixtures offer longer service life, lower power consumption, and sealed, maintenance-free designs.
• IP rating: Look for IP67-rated units for full water and dust resistance in demanding saltwater environments.
• Certification: Verify USCG, ABYC, and COLREGS compliance for the waters you navigate.

Top Brands in Bi-Color, Tri-Color Bow & Steaming Lights

Hella Marine is a globally recognized leader in marine navigation lighting, with over a century of maritime lighting expertise. Their NaviLED series is IP67-rated, fully sealed, and meets USCG, COLREGS, and RINA standards, making them a trusted choice for recreational, commercial, and military vessels alike.

Attwood Marine offers one of the broadest selections of bow and steaming lights on the market, including stowaway pole-mount designs, stainless steel deck-mount fixtures, and bi-color LED options. Known for user-friendly installation and durable construction, Attwood lights are a go-to for boaters looking for reliable, regulation-compliant solutions at a range of price points.

Sea-Dog Line rounds out the category with a focused lineup of combination bow lights built from corrosion-resistant materials like stamped 304 stainless steel. Their straightforward, low-profile designs make them a practical choice for replacement installations on a wide variety of vessels.