Nilight 4" Round Trailer Tail Light Red — Flush-Mount 4" LED Stop/Turn Brake, IP67 Waterproof

Nilight 4" Round Trailer Tail Light is a flush-mount red LED lamp that combines bright stop/turn/brake output with weatherproof durability for trailers, trucks, and specialty vehicles.

Built for towing and work vehicles, this compact 4-inch lamp uses upgraded LEDs and a sealed housing to deliver greater visibility and long service life. The light functions as stop, brake, turn and tail in a single housing, fits a 4.46" mounting hole with 1.87" depth, and connects to a standard 3-prong 12V plug—making it a straightforward replacement or upgrade for trailers, tractors, and trucks.

How bright is this Nilight trailer tail light?

The lamp uses 12 high-quality LEDs arranged to increase output and widen the beam angle, producing up to three times the apparent brightness of many stock lights. High-output LEDs provide a clear, visible signal for stop and turn functions while lower-level tail illumination reduces glare for following drivers.

• 12 upgraded LEDs for stronger, more even illumination
• Three times brighter than many standard trailer lights
• Dual-intensity design: bright for brake/turn, dimmer for tail

What makes it durable in harsh weather?

The housing is highly silicone-sealed and rated IP67 for water resistance, so it can withstand rain, splashes, and temporary immersion. The design also improves heat dissipation around the LED elements, extending operating life in high-use applications.

• IP67 waterproof rating protects against dust and temporary immersion
• Silicone sealing prevents water intrusion around the lens and connections
• Enhanced heat dissipation for longer LED lifespan

How easy is installation and what are the mechanical requirements?

Installation is a simple three-step surface-mount process: place the grommet and lamp into the hole, insert the 3-prong plug, and connect the three wire leads to your vehicle wiring. Confirm the hole size and depth—4.46" diameter and 1.87" depth—to ensure a flush fit before buying.

• Surface-mount design with grommet for secure fit
• 3-prong plug and three-wire lead for standard 12V wiring connections
• Required hole dimensions: 4.46" diameter, 1.87" depth

Which vehicles and systems does this Nilight lamp work with?

Designed for 12V DC systems, this lamp is suitable as a turn, brake, and tail light for trailers, trucks, utility vehicles, tractors, and many specialty vehicles. It’s a universal option when the vehicle has compatible hole size and wiring.

• Compatible with 12V DC electrical systems
• Fits semi-trailers, horse trailers, travel trailers, dump trucks and tractors
• Best used as a direct replacement when hole size and depth match

Who is this for: This Nilight 4" red round trailer tail light is aimed at vehicle owners, fleet managers, and DIY mechanics who want a brighter, weatherproof LED replacement that’s easy to install. It’s ideal for anyone upgrading older incandescent lamps, replacing damaged lights, or standardizing trailer lighting across a fleet—so long as the mounting hole and 12V wiring match the product specifications.