Nilight 4" Round Trailer Tail Lights 4-Pack 24-LED Red — IP67 Waterproof, Dual-Brightness

These compact round lights combine bright SMD LEDs, dual-brightness operation and a sealed IP67 housing to deliver clear signaling and long service life for trailers, trucks, tractors and other 12V vehicles. Each lamp uses a high-transparency lens and efficient heat management to keep output steady under road vibration and wet conditions. The set includes four matching fixtures and simple three-wire plugs for a flush-mount installation into a 4.57" diameter opening.

How bright are these lights and what makes them visible?

Each light contains 24 high-output red SMD LEDs paired with a clear lens to boost visible intensity. The LEDs are arranged and thermally managed to maintain brightness without rapid dimming, improving visibility for following drivers.

• 24 SMD LEDs per lamp for concentrated, uniform light
• High-transparency lens to maximize output
• Improved heat dissipation for consistent performance
• Distinct brightness levels to signal braking versus running

Can one light handle running, braking and turning signals?

Yes — each unit supports two brightness settings so it can act as a steady running light and switch to a brighter mode for brake or turn signals. The change in intensity is clear to motorists behind, helping communicate your vehicle's actions.

• Low brightness for continuous tail/running light use
• High brightness for brake and turn indications
• Quick intensity change visible to following traffic
• Works with standard 3-wire trailer wiring (12V DC)

What are the installation requirements and mounting details?

Installation is designed to be straightforward for a flush mount: cut the recommended hole, fit the rubber grommet, insert the light and connect the three-prong plug to your trailer wiring. The housing depth and plug style simplify fitting into common trailer side and rear panels.

• Required hole diameter: 4.57 inches, depth: 1.89 inches
• Flush-mount design with supplied grommet for a snug fit
• Three-wire lead and 3-prong plug for quick connection
• Compact form factor fits many trailer and truck panels

How durable and weather-resistant are these lights?

The lenses and housings are ultrasonically sealed to meet an IP67 waterproof rating, keeping moisture and dust out when the rear plug is firmly seated. That sealing plus robust LED components help the lights withstand harsh weather and road spray without corroding or failing prematurely.

• IP67-rated sealing protects against water immersion and dust
• Ultrasonic lens-to-housing bond prevents leaks
• Durable construction resists vibration and road debris
• Suitable for heavy use on trailers, trucks and boats

Who is this for? These Nilight 4" round tail lights are ideal for owners and fleet managers who need reliable, bright signaling for 12V trailers, pickups, RVs, horse trailers, dump trucks and similar vehicles. They suit DIY installers who want a neat flush-mount finish with quick plug-in wiring, and anyone who needs weatherproof, long-lasting tail/stop/turn lamps that improve roadside visibility without complex rewiring.