Partsam 4" Waterproof 12-LED Backup Reverse Light Pair — White Flange Mount, Sealed Corrosion‑Resistant

These are two 4-inch flange-mount, waterproof 12-LED reverse/backup lights from Partsam designed for trucks, trailers, RVs and boats.

Built as sealed units with an acrylic lens sonic-welded to a molded plastic housing, these compact backup lights combine corrosion resistance with dual-brightness wiring. They fit into a 4.1" inner diameter cutout and ship as a pair ready to hardwire, offering a straightforward upgrade or replacement for vehicles that need reliable reverse illumination.

How durable and weatherproof are these lights?

The housing and lens are molded and sonic-welded into one sealed assembly, so there are no removable trims that can leak. The materials resist rust and water intrusion, making them suitable for wet or salty environments common to towing and marine use.

• Fully sealed acrylic lens bonded to housing
• All-weather molded plastic resists corrosion
• Designed for use on boats, RVs, trailers, and trucks
• Flange mount reduces exposed seam points

What are the size and mounting requirements?

Each lamp has an outer diameter of 140mm (5.5") and an inner cutout diameter of 105mm (4.1"). Installation requires drilling to match the flange and a hole center spacing of 104mm (4"). The low profile sits about 24mm (0.9") tall from the mounting surface.

• Outer diameter: 140mm (5.5")
• Inner cutout: 105mm (4.1")
• Height: 24mm (0.9") for a slim, flush fit
• Hole distance (center-to-center): 104mm (4")

How do I wire and control the brightness settings?

Wiring is done with three hardwired leads: ground, high-brightness, and low-brightness. Use the white wire for ground, the red wire to activate the maximum output, and the black wire for a lower-intensity setting. This lets you pair the lights with existing brake/reverse circuits or switch them independently.

• White wire = ground
• Red wire = high brightness (full output)
• Black wire = low brightness (reduced output)
• Hardwired leads for permanent, reliable installation

Who is this for? These Partsam lights suit owners who need compact, robust reverse illumination: tow-vehicle operators, trailer and RV owners, boaters mounting stern lights, and fleet managers seeking a sealed, low-profile replacement. They are ideal when you want a durable LED option that resists corrosion, installs with standard drilling, and provides selectable brightness for different driving or docking conditions.