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

Partsam 2PCS 4" red LED stop/turn/tail flange-mount lights are sealed, waterproof 12-diode lamps designed for trucks, trailers, RVs, and boats that provide bright, low-profile signaling in a compact 4" housing.

These flange-mount lamps combine a sonic-welded acrylic lens and molded housing to form a single waterproof unit built for outdoor vehicle use. Each fixture contains 12 high-visibility LEDs and is supplied as a hardwired three-wire assembly for easy installation. Note: the light functions as either a tail light (low brightness) or a stop/turn light (high brightness) depending on the circuit; it cannot perform both modes at once.

How do these lights mount and what are the exact dimensions?

The lights mount via a flange that matches a 105 mm inner diameter opening with a 105 mm hole spacing. The shallow 24 mm profile keeps the lamp close to the vehicle surface for a clean, low-profile installation. These physical specs make them suitable for many trailer and truck lamp cutouts.

• Outer diameter: 140 mm (5.5")
• Inner diameter / hole spacing: 105 mm (4")
• Height (depth): 24 mm (1")
• Flange mount compatible with standard 4" round cutouts

What wiring does the Partsam light use and how do I connect it?

Each lamp is hardwired with three color-coded conductors for simple connection to a vehicle harness. Ground the white wire, use the black wire for the low-brightness tail function, and the red wire for the high-brightness stop/turn function. Always disconnect power before wiring and verify with a multimeter if unsure.

• White wire: ground (chassis)
• Black wire: low-brightness tail light
• Red wire: high-brightness stop/turn
• Designed for 12V vehicle electrical systems

Are these lights weatherproof and durable for marine or roadside use?

The lens is sonic-welded to the housing so the lens and body form a single sealed unit, minimizing water intrusion and corrosion risk. Molded plastic housing and impact-resistant acrylic lens provide long-term outdoor resistance against road spray, salt, and UV exposure. Ideal when a sealed, maintenance-free signal lamp is needed.

• Sonic-welded acrylic lens for a waterproof seal
• Molded plastic housing resists corrosion and impacts
• Suitable for trucks, trailers, RVs, and boats
• Low-profile design reduces snagging and exposure

How bright and visible are the 12 LEDs in real conditions?

The 12 diodes deliver a high-intensity output for clear daytime and nighttime visibility, improving recognition of stop and turn signals. The dual-level wiring provides distinct low and high brightness modes to separate tail illumination from brake/turn signaling. LED technology also means long life and low current draw compared with incandescent bulbs.

• 12 high-brightness LEDs for visible signaling
• Two brightness modes via wiring for distinct functions
• Energy-efficient LEDs with extended service life
• Consistent output in varied weather conditions

Who is this for: These Partsam flange-mount LED lamps are aimed at vehicle owners and fleet managers who need a compact, sealed replacement or upgrade for 4" round signal lamps—especially on trailers, work trucks, RVs, and marine craft where waterproofing and low profile matter. They suit DIY installers and mechanics looking for straightforward three-wire hookups and durable, bright LED signaling without modifying existing cutouts.