Partsam 4" Red LED Stop Turn Tail Flange Light 2-Pack — 12-LED Sealed, Low-Profile

These Partsam lights are a sealed pair of 4-inch red flange-mount LED lamps that serve as stop, turn, or tail signals for trailers, trucks, RVs and boats. Partsam’s 2PCS 4" Red Stop Turn Tail Brake lamps provide a compact, weatherproof LED lighting solution for vehicles and trailers. Each lamp uses 12 bright diodes behind an acrylic lens that’s sonic-welded to the housing, creating a single sealed unit designed to resist corrosion and moisture. The low-profile flange mount fits a 105 mm (4") hole pattern and hardwiring includes three color-coded conductors for easy installation.

How bright and durable are these LED lamps?

These lights use 12 individual LEDs to deliver a clear, visible signal in both bright daylight and low-light conditions while minimizing power draw. The molded plastic housing and sonic-welded acrylic lens form a waterproof assembly that helps prevent water ingress and corrosion.

• 12 high-efficiency diodes per lamp for reliable visibility
• Acrylic lens permanently bonded to housing for watertight protection
• All-weather molded plastic resists rust and saltwater corrosion
• Low-profile 24 mm (1") height reduces snagging and road damage

What are the exact size and mounting requirements?

Each lamp is designed for flange mounting into a standard 105 mm (4") inner diameter opening and uses an outer diameter of 140 mm (5.5"). The unit’s compact height keeps the assembly close to the mounting surface for a neat fit on trailers and vehicle bodies.

• Outer diameter: 140 mm (5.5"), inner diameter: 105 mm (4")
• Height: 24 mm (1") for low-profile mounting
• Hole distance: 105 mm (4") matching common flange patterns
• Flange mount hardware needed as per vehicle specifications

How is wiring and operation handled during installation?

Partsam lights come hardwired with three color-coded leads so installers can quickly connect the lamp to the vehicle’s brake, tail or turn circuits. Note that each fixture can operate either as a tail light or as a turn/stop light but is not designed to function simultaneously in both modes on a single unit.

• White = ground, Red = high brightness (brake/turn), Black = low brightness (tail)
• Simple 3-wire hookup compatible with most 12V vehicle systems
• Use relays or controllers as needed when wiring multiple lamps
• Not rated to serve as both tail and turn signals at the same time on one lamp

Who is this light best suited for? These Partsam 4" red LED flange lamps are ideal for truck and trailer owners, RV builders, marine applications and fleet maintenance teams who need a compact, sealed signaling lamp that resists weather and saltwater. Choose this set when you want a low-profile, easy-to-wire LED replacement for worn-out incandescent fixtures, or when outfitting a new trailer with durable, energy-efficient lights that match common 4" mounting patterns.

FAQ

Q: Can one lamp function as both tail and turn at the same time?

A: No. Each lamp must be used either as a tail light or as a turn/stop light, not both simultaneously.

Q: What do the three wires do on the Partsam light?

A: White is ground, Red is the high-brightness lead (brake/turn), and Black is the low-brightness tail lead.