Partsam 4" Flange-Mount Waterproof Backup Reverse LED Light Pair — White, 12-LED, Slim Sealed Design

Built as a compact, sealed lighting solution, the Partsam 2PCS 4" Waterproof Backup Reverse Lights combine a molded plastic housing and an acrylic lens sonic-welded into a single waterproof assembly. The fixtures are designed for flush flange mounting; they require a drilled installation and hardwiring with three conductors for ground, high-brightness, and low-brightness functions. Their slim profile and corrosion-resistant construction make them suitable for exterior vehicle applications where a compact, reliable light source is needed.

How do these lights stand up to wet or salty conditions?

The Partsam units arrive as a fully sealed assembly with the acrylic lens permanently fused to the housing, preventing water ingress at the lens-housing seam. The all-weather molded plastic resists corrosion and mechanical wear typical on road and marine vehicles.

• Fully sonic-welded lens and housing for waterproof protection.
• Molded plastic construction that resists rust and salt corrosion.
• Slim sealed design minimizes places for water to collect.

What size hole and mounting pattern do I need for installation?

These lights are flange-mounted and require drilling to fit the supplied dimensions: the outer diameter is 140 mm (5.5"), inner cutout diameter is 105 mm (4.1"), and the fixture height is 24 mm (0.9"). The mounting hole center spacing is 104 mm (4"), so measure carefully before cutting your panel.

• Outer diameter: 140 mm (5.5").
• Inner diameter: 105 mm (4.1") for the cutout.
• Hole center distance: 104 mm (4"); fixture height: 24 mm (0.9").

How do I wire these lights to my vehicle's electrical system?

Each lamp is hardwired with three color-coded leads for straightforward connection to common vehicle circuits: white for ground, red for high-brightness, and black for low-brightness. Use appropriate connectors, fuses, and routing to protect the wiring against chafing and moisture.

• White wire = ground (connect to vehicle chassis or ground point).
• Red wire = high brightness (backup/stop function as configured).
• Black wire = low brightness (tail/marker function when used).

What performance can I expect from the 12 LEDs in each unit?

Each light contains 12 LEDs arranged to deliver focused, bright white illumination suitable for reversing and auxiliary signaling. They provide clear visibility at close range and are intended as serviceable vehicle lighting, not as a primary headlamp substitute.

• 12 high-output LEDs per lamp for bright, concentrated light.
• White color output appropriate for reverse and auxiliary lighting.
• Compact layout gives broad coverage near the vehicle’s rear.

Who is this for: The Partsam 2PCS 4" Waterproof Backup Reverse Lights suit owners of trucks, trailers, RVs and boats who need low-profile, weatherproof backup and auxiliary lighting. They are ideal for DIY installers and fleet maintenance teams who require sealed flange-mount fixtures with clear wiring designation and compact dimensions. If you need corrosion-resistant, easy-to-wire reverse lamps with a slim profile for recessed mounting, these Partsam LEDs offer a straightforward, durable option.