Partsam 4" Flange-Mount Backup Reverse Light 2-Pack White — 12-LED Waterproof Low-Profile

These compact flange-mounted reverse lights combine a rugged molded housing with a sonic-welded acrylic lens to form a single waterproof assembly that resists corrosion and weather. Each lamp measures roughly 140 mm outer diameter with a 105 mm inner cutout, and installs with a 104 mm bolt pattern—intended for recessed flange mounting where a low-profile, durable backup light is needed.

How durable are these lights for outdoor use?

They are built with an all-weather plastic body and a lens welded to the housing for a sealed unit that keeps out moisture and contaminants. That construction minimizes points of water entry and reduces corrosion risk compared with multi-piece assemblies.

• Sonic-welded acrylic lens bonded to housing to maintain a watertight seal
• Molded plastic housing resists rust and outdoor wear
• Designed for use on trucks, trailers, RVs and marine applications

What are the sizing and installation details I should know?

Each light has an outer diameter near 140 mm (about 5.5") with a 105 mm (4.1") inner opening; the mounting hole centers are 104 mm apart and drilling is required for flange installation. The unit profile is slim (approximately 24 mm high) so it fits into recessed or low-clearance locations.

• Outer diameter: 140 mm (5.5"); inner diameter: 105 mm (4.1")
• Overall height: ~24 mm (0.9") for low-profile mounting
• Mounting hole distance: 104 mm; drilling required for flange holes

How do I wire these reverse lights and what functions do the wires control?

Each lamp is factory hardwired with three color-coded conductors to simplify connection: a white ground, a red lead for the brighter/high-output circuit, and a black lead for the lower-output circuit. That wiring supports installations needing both reduced and full-intensity backup illumination without modifying the sealed housing.

• White wire = ground connection for safe, stable grounding
• Red wire = high-brightness circuit for stronger illumination
• Black wire = low-brightness circuit for less intense output

What lighting performance and applications can I expect?

Each lamp contains 12 white LEDs arranged to provide bright, even reverse lighting. The sealed construction and LED efficiency make them suitable as dedicated backup lamps or auxiliary reverse lights on work trucks, trailers, RVs, and small boats where long life and moisture resistance are important.

• 12 high-efficiency LEDs per lamp for crisp white illumination
• Low-profile flange design fits recessed mounting points
• Two intensity leads allow flexible brightness control in one fixture

Who is this for: these Partsam 4" flange-mount reverse lights are aimed at vehicle owners and fabricators who need compact, waterproof backup lamps that withstand outdoor conditions. They suit professional fleets, trailer builders, RV enthusiasts, and boat owners seeking a sealed LED lamp with simple three-wire wiring and a low-profile flange fit. If you need robust reverse lighting that resists moisture and offers selectable brightness without opening the housing, this two-piece set is a practical, installation-friendly option.