Best 4 Inch Round Tail Trailer Lights (2025 Guide)
The Best Ranked 4 Inch Round Tail Lights Led
Nilight
The Nilight TL-18 is a set of two 4-inch round red LED trailer tail lights designed for trucks, trailers, RVs, and Jeeps. These surface mount lights feature upgraded Piranha LEDs that provide brighter illumination, better heat dissipation, and a longer lifespan. With an IP67 waterproof rating, they are built to withstand harsh weather conditions. Easy to install with a 3-prong plug and compatible with a 12V DC system, these lights enhance visibility and safety on the road.
Key Features:
- Each light contains 12 upgraded Piranha LEDs for higher brightness, better heat dissipation, and extended lifespan
- Produces three times brighter light for turn and brake signals, and lower brightness for tail lights to improve visibility
- Simple surface mount installation with 3-prong plug; requires a 4.3-inch diameter hole and 2-inch depth
- IP67 waterproof rating with silicone sealing to protect against harsh weather
- Compatible with 12V DC systems and works as turn, brake, and tail lights for trucks, trailers, RVs, and other vehicles
Pros
- Bright and highly visible LED lighting enhances safety
- Durable and waterproof construction suitable for all weather conditions
- Straightforward installation with surface mount design and plug-in connection
Cons
- Requires precise hole size (4.3-inch diameter) which may not fit all vehicles without modification
Partsam
The Partsam 6-piece LED trailer tail lights kit includes four 4-inch red round stop, turn, and tail lights along with two white round backup and fog lights. Designed for easy installation with included rubber grommets and 3-prong wire pigtails, these waterproof and impact-resistant LED lights provide bright, efficient illumination for trucks, trailers, RVs, and more. With universal compatibility for 8-16V DC systems, this kit offers reliable signaling and enhanced safety on the road.
Key Features:
- Includes 4 red 4-inch round LED stop, turn, and tail lights, plus 2 white 4-inch round LED backup and fog lights.
- Comes with round rubber grommets and 3-prong wire pigtails for easy, complete installation.
- Waterproof (IP65 rated) and impact-resistant design, sealed to prevent water and shock damage.
- Lights function as stop, turn, tail (red lights), and backup or fog lights (white lights).
- Recessed mount design requires a 4.5-inch hole for installation; grommet ring is about 5 inches with a 4-inch inner diameter.
- Led lights operate on 12V DC with low power consumption, less heat generation, and faster lighting response than incandescent bulbs.
- Universal fit compatible with most vehicles and trailers powered by 8-16V DC, including trucks, trailers, RVs, buses, boats, and utility vehicles.
Pros
- Easy to install with included grommets and wire pigtails.
- Durable, waterproof, and impact-resistant for reliable outdoor use.
- Bright LEDs consume less power and illuminate faster than traditional bulbs.
- Versatile application across a wide range of vehicles and trailers.
Cons
- Not suitable for underwater use despite waterproof rating.
- Installation requires drilling a precise 4.5-inch hole which may not fit all existing mounts.
Partswcgg
The Partswcgg 4-inch round LED trailer tail lights come in a set of four and offer bright, energy-efficient lighting with 24 LEDs each. These waterproof lights function as stop, turn signal, tail, marker, and running lights, making them a versatile choice for various vehicles. Designed for easy flush mount installation, they include rubber grommets and 3-prong wire pigtails for a seamless setup. Suitable for a wide range of 8-16V vehicles, these durable tail lights provide reliable performance and enhanced visibility on the road.
Key Features:
- Set of 4 round 4-inch red LED tail lights with 24 bright LEDs each
- Waterproof design rated IP65 (not for underwater use)
- Multi-function: stop, turn signal, tail, marker, and running lights
- Includes rubber grommets and 3-prong wire pigtails for installation
- Flush mount installation requiring about a 4.6-inch hole
- Compatible with 8-16V DC vehicles such as trucks, trailers, RVs, and utility vehicles
- 12V DC input with low power consumption
Pros
- Bright and energy-efficient LED lighting with multiple functions
- Waterproof design suitable for outdoor use
- Includes all necessary mounting accessories for easy installation
- Wide vehicle compatibility
Cons
- Not suitable for underwater applications
- Installation requires drilling an appropriately sized hole
Konrali
The Konrali 10-pack 4-inch round red LED trailer tail lights offer a reliable and bright lighting solution for various vehicles including trucks, trailers, RVs, and agricultural equipment. Each light features 24 efficient LEDs that consume less power than traditional bulbs while providing superior brightness. Designed for easy flush-mount installation, these waterproof lights come with rubber grommets and 3-prong wire pigtails for secure and convenient wiring. Their durable construction withstands harsh environments, ensuring long-lasting performance.
Key Features:
- Set of 10 waterproof 4-inch round red LED trailer tail lights
- Each light contains 24 bright, energy-efficient LED diodes
- Includes rubber grommets and 3-prong wire pigtails for easy installation
- IP65 rated for protection against dust, water, and corrosion
- Flush mount design with 5.6-inch diameter grommet ring and 1.8-inch thickness
- Wiring: white wire is ground, red wire for stop/turn/brake lights, black wire for tail running lights
- Compatible with 12V DC systems, suitable for trucks, trailers, tractors, RVs, and more
Pros
- Bright and energy-efficient LEDs that outshine incandescent bulbs
- Durable waterproof construction suitable for harsh weather conditions
- Includes all necessary mounting accessories for easy installation
Cons
- Installation requires drilling a 4.5-inch hole which may not fit all vehicles
- Wiring colors may require careful attention to avoid connection errors
Partscgw
The Partswcgg 10-piece set of 4-inch round LED trailer tail lights provides reliable and bright illumination for various vehicles. Featuring 12 red LEDs per light, these waterproof tail lights serve as stop, turn signal, brake, and running lights. Designed for easy installation with included rubber grommets and 3-prong wire pigtails, they fit most 12V DC vehicles such as trailers, trucks, and RVs. Their flush mount design and energy-efficient LEDs ensure durability and visibility on the road.
Key Features:
- Set of 10 round waterproof trailer tail lights, each with 12 red LEDs
- Functions include stop, turn signal, brake, and running lights
- Measures approximately 5-1/8 inch diameter with 4 inch inner light area; requires about 4-1/2 inch hole for installation
- Includes round rubber grommets and 3-prong wire pigtails for easy flush mounting
- Compatible with most 12V DC vehicles including semi trucks, trailers, utility trucks, horse trailers, pickup trucks, UTVs, and more
- IP65 waterproof rating; not suitable for submersion
- White wire is ground, red for high brightness, black for low brightness
- Energy-efficient LEDs that use less current but offer higher brightness than incandescent bulbs
- Responsive customer service with support available within 24 hours
Pros
- Bright and energy-efficient 12 LED lights increase visibility
- Versatile compatibility with a wide range of 12V vehicles
- Complete installation kit included with grommets and wiring pigtails
- Durable waterproof design ideal for outdoor use
- Flush mount design offers a neat and secure fit
Cons
- Not suitable for underwater use despite waterproof rating
- Installation requires drilling precise hole size, which could be challenging for some users
PVerandio
The PVerandio 8-pack of 4-inch red LED trailer tail lights offers bright, energy-efficient lighting with multiple functions including stop, turn, tail, marker, and running lights. Designed for durability and easy installation, these IP67 waterproof lights are perfect for various vehicles such as trucks, trailers, RVs, and UTVs running on a 12V system. With a flush mount design and a 2-year warranty, they deliver reliable performance and long service life.
Key Features:
- Each 4-inch round tail light contains 24 bright, energy-efficient LEDs with excellent heat dissipation and wide-angle illumination for enhanced visibility and durability.
- Multi-functional design acts as stop light, turn signal, tail light, marker light, and running light, compatible with 12V DC systems and rated IP67 waterproof.
- Flush mount installation with grommet ring (approx. 5.3-inch outer diameter, 4-inch inner diameter, 1-inch thickness) and 3-prong wire pigtails for quick and secure setup.
- Suitable for a variety of vehicles including trucks, trailers, tractors, semi-trailers, horse trailers, RVs, dump trucks, buses, and utility vehicles.
- Includes a 2-year warranty and responsive customer support with a commitment to reply within 24 hours for any inquiries.
Pros
- Bright and energy-efficient LEDs with a longer lifespan than traditional bulbs.
- Versatile multi-function lighting suitable for numerous vehicle types.
- Easy to install with flush mount design and clear wiring color codes.
Cons
- Installation requires surface mounting with the provided grommets, which may not fit all existing mounts perfectly.
So, you’ve got your list of products ready, great start. But if you’re like most people, you’re probably wondering: what actually makes one 4 inch round LED trailer tail light better than another? Brightness? Durability? Easy wiring? Truth is, it’s a mix of all these things, plus a little context about how and where you’re using them. Let’s break it down.
Why 4 Inch Round LEDs Are the Go-To Choice
First off, size matters, literally. The 4-inch round shape isn’t random. It’s almost a universal fit for trailers, trucks, and utility rigs. Whether you’re upgrading from old incandescent lights or replacing worn-out LEDs, this size tends to “just work” without cutting or modifying housings. That’s a relief, right?
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But here’s the kicker: LED technology makes a world of difference. Unlike old-school bulbs that burn out or dim after a few months, LEDs run cooler, last longer, and shine brighter. And when you’re towing on a foggy night or backing up near a boat ramp, that extra visibility isn’t just nice, it’s peace of mind.
What Really Matters When Choosing
Not all trailer lights are built the same. Some look good out of the box but fail under the first rainstorm. Others promise “easy install” yet leave you tangled in wires. So what should you be watching for?
- Brightness & Visibility: Not all LEDs are equal. Check lumens, not just marketing hype. The brighter (without blinding), the safer.
- Waterproofing: Trailers face everything, rain, road spray, even dunking if you’re hauling a boat. Look for IP67 or higher ratings.
- Lens Quality: A sturdy polycarbonate lens won’t crack if a stray rock bounces off it.
- Wiring & Connectors: Grommet-mount vs. flange-mount can change the ease of install. Also, sealed connectors beat loose wires any day.
- DOT Compliance: A must-have if you’re driving on public roads. No exceptions here.
These may sound like small details, but anyone who’s ever rewired lights on the side of the highway knows: details matter.
Common Situations Where These Lights Shine (Literally)
Here’s where I’ll go a bit off track, because how you use your trailer changes what you need.
- Boat owners: Saltwater is merciless. Go for marine-grade waterproofing.
- Farmers hauling gear: Dust, vibration, and mud call for rugged housings and vibration resistance.
- Everyday towing: If you’re just pulling a small utility trailer now and then, ease of wiring might matter more than “military-grade toughness.”
Think of it like choosing shoes: you wouldn’t wear hiking boots to the beach. Same with trailer lights.
Installation: Easier Than You Think (Mostly)
Here’s the good news, most modern 4 inch round LEDs use plug-and-play setups. Grommet mounts pop in, sealed plugs connect, and you’re done in minutes. That said, sometimes things don’t go smoothly.
Maybe your old wiring harness isn’t compatible. Or your trailer frame has a bit of rust where the ground connects. Don’t panic, sand the contact, double-check wiring diagrams, and you’ll usually be back in business. A multimeter can be your best friend here.
And if you’re wondering whether you can DIY this without a mechanic? Absolutely. Just take your time, label wires if needed, and remember: black is often ground, but not always. Manufacturers like to switch it up, so read their chart.
Do They Actually Save You Money?
It’s tempting to think of LEDs as “just lights.” But here’s the bigger picture, every time a bulb fails, you lose time. Maybe even risk a ticket. LEDs, on the other hand, are rated for tens of thousands of hours. That means fewer replacements, fewer roadside headaches, and more money staying in your pocket over the long haul.
It’s the kind of upgrade that quietly pays for itself.
Wrapping It Up
So, when you’re looking at those shiny product listings up top, keep these factors in mind: brightness, waterproofing, wiring simplicity, and long-term durability. Whether you’re hauling a boat, moving equipment, or just running errands with a small trailer, the right set of 4 inch round LED tail lights can make your rig safer and your life easier.
Sometimes it’s the smallest gear that makes the biggest difference, and trailer lights definitely fall into that camp.
