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Fusion LED Hardwired Trailer Light - Stop, Tail, Turn, Backup - Round - Red/Clear X Lens - 20 Diodes
Optronics

Fusion LED Hardwired Trailer Light - Stop, Tail, Turn, Backup - Round - Red/Clear X Lens - 20 Diodes

Part Number: OPT37NR
In Stock
$32.99
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4" Round. All-in-one waterproof trailer light serves 4 functions: brake, tail, turn, and backup light. Hardwired and ready to install. Red lens set inside clear lens. Recessed mount with rubber grommet (sold separately). 20 Diodes. Great Prices for the best trailer lights from Optronics. Fusion LED Hardwired Trailer Light - Stop, Tail, Turn, Backup - Round - Red/Clear X Lens - 20 Diodes part number OPT37NR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (43)
  • Q & A (0)
  • Videos (2)
  • Photos

Optronics Trailer Lights - OPT37NR

Highlights

  • One Light, 4 Functions: Provides stop, tail, turn, and backup lights for your trailer.
  • Reliable In Any Weather: Sonically sealed, waterproof housing is fully submersible.
  • Fewer Replacements Needed: LEDs last 50 times longer and use less power than bulbs.
  • Tough Against Vibration: SMT construction resists shock and improves heat control.
  • Easy, Ready-to-Wire Setup: Hardwired design with 8" leads simplifies installation.
  • Road Legal: Meets DOT and FMVSS 108 standards so you stay compliant.

Features to know about

Better Visibility and Safety: 4-Function LED Design

This 4-5/16" round Fusion LED light packs four essential functions—stop, tail, turn, and backup—into one clean, waterproof unit. The outer band of 20 red LEDs powers the brake, tail, and turn functions, while the white center LEDs handle backup duty. It keeps everything bright and easy to see, even in poor lighting. You get dependable illumination that meets DOT and FMVSS 108 standards for visibility and safety.

No More Fragile Bulbs: Long-Lasting, Efficient LEDs

Incandescent bulbs burn out fast and draw more power. This sealed LED light fixes that problem with diodes that last up to 50 times longer and use less current at 12V. The solid-state design means no filaments to break, no bulbs to replace, and steady brightness every time you hit the brakes or shift into reverse. It’s a simple upgrade that just works.

Built for Harsh Conditions: Fully Submersible and Sealed

Water damage ruins lights fast, but this one is ready for the elements. The housing and lens are sonically sealed into a single waterproof piece that’s fully submersible. Whether it’s backing into water or traveling through driving rain, moisture stays out. The durable polycarbonate build holds up against vibration, impact, and corrosion.

Simple Setup: Hardwired and Ready to Mount

Installation is straightforward thanks to the color-coded wiring—black for tail, red for stop/turn, brown for backup, white for ground—and an 8" lead length that gives you room to work. It’s designed for a recessed mount using a rubber grommet (sold separately) to create a clean finish. Once it’s in place, you’ll have a reliable light that looks sharp and performs consistently over time.

Specs

Electrical

  • Wire configuration: Black: tail, Red: stop/turn, Brown: backup, White: ground
  • Voltage: 12V

Dimensions

  • Overall diameter: 4-5/16"
  • Depth: 1"
  • Wire length: 8"

Lighting

  • Diodes: 20

Warranty

  • LEDs: Lifetime warranty

STL314MGHB Optronics Fusion Hardwired 4" Round Combination LED Trailer Taillight - Red/Clear X Lens - Weathertight Plug - Black Grommet





Video of Fusion LED Hardwired Trailer Light - Stop, Tail, Turn, Backup - Round - Red/Clear X Lens - 20 Diodes
Video Thumbnail Video Player Dialog

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Fusion LED Hardwired Trailer Light Review

Hello, everybody. This is Jeff at etrailer.com. Today we're gonna take a look at this Optronics Round Fusion LED Hardwired Stop Tail Turn and Backup Trailer Light with the Red and the Clear X Lens. Now, this is a round trailer tail light. Has a nice, smooth, bright red exterior which will serve four functions. And we do have this plugged into some 12 volt power so I can show you those functions.

So if I turn the power on, you'll be able to see, you'll get your tail lights. Go ahead and turn off the overhead. There's your tail light function. And then, when you apply your brakes, you'll be able to see how that gets a lot brighter when your brakes are applied. And then, when you hit your turn signals, you can see that your turn signals will cause that to get brighter and flash.

And the last one I wanna show you is that center X lens. That is actually your reverse light or backup light. And if we hook that one up, you'll be able to see that when you go into reverse, you'll get the X lens all lit up and it's all white LEDs. There is a total of 20 LEDs on this. And again, there's your backup.

So we'll go ahead and turn back on our overhead lights. Go ahead and turn off our power. Now, this is an sonically sealed waterproof housing and lens unit, which makes it submersible. Does use durable SMT technology, which is the construction of the LED circuit board that'll better withstand shock and vibration, and allows for improved heat distribution. And as we mentioned, this uses LEDs, which make great replacements for incandescent lights.

They'll last about 50 times longer. LEDs are more efficient, 'cause they'll provide brighter light with less power output. And the big thing is there's no bulbs to replace or brittle filaments that are gonna break, and you do get a lifetime warranty on the LEDs. We mentioned it's a red lens that's set inside with this white X lens on it. So the red lens has the red LEDs for the tail light, and the clear lens has the white LEDs for the backup light. Now, to install this, it is a recessed grommet mount design. The grommet will go right around here. Now, the rubber grommet is not included. We do sell that separately on our website. It's part number A45GB. Now, this is hardwired and ready to install. You can see the wire length is about eight inches. And the wire configuration, the black wire is your tail. Your white wire would be your ground. Your red wire is your stop and turn. And your brown wire is for the backup. This is a 12 volt light. Last thing I'm gonna do is just give you the overall dimensions on it. So the diameter, from one end to the other, is four and a quarter inches. And the depth of it front to back is right about one inch deep. But that should do it for the review on the Optronics Round Fusion LED Hardwired Stop Tail Turn and Bckup Trailer Light with the Red and the Clear X Lens.

Ratings & Reviews

4.9

43 reviews
Review sort icon
4" Round. All-in-one waterproof trailer light serves 4 functions: brake, tail, turn, and backup light. Hardwired and ready to install. Red lens set inside clear lens. Recessed mount with rubber grommet (sold separately). 20 Diodes.

by:

Good products exceptional service



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Bright light for tail, brake/stop, and back up are an excellent upgrade to the trailer.



by:

This product is the missing link of the trailer market. There is no equivalent.

Shipping to Canada was fast and hassle free.

I strongly recommend the product and the seller.



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Great Lights, Diodes all remaining bright, Would Highly recommend



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One of the best trailer light kits I've ever had. Perfect fit for my trailer. Being able to have back-up lights now is a game changer and long overdue.
Very well made and I have no reservations that these lights will last a long time. I like the fact that they aren't overly bright while in running mode. Don't want to give an impression that brake lights are on until they are. When they are applied and ON there is no mistaking. Wonderful lights. Affordable and well made.



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I bought a similar product on eBay and this one is much brighter, well worth the extra money!



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Good all-in-one lights replaced my old old incandescent lights. Really visible. Works great. Plastic housing seems like it could be susceptible to damage.



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These work great and fixed the problem with my truck and its trailer management system. I was having issues with a cheaper set I ordered from another site. My truck's fancy trailer management system would think there was a fault and cut power to the trailer lights. I replaced the lights with these and so far so good. Thank you!



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Lights worked perfectly and it was very easy to I stalled.



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You always have what I’m looking for. Good product, and got it quickly



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Great product. Easy to install. Definitely recommend this product.



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Great quality light. Replaced old incandescent lights with these LED lights on my boat trailer. They are much brighter.



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Had to wing it since the wires weren't all the same color, but it appears this was the exact part I needed!



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Wires not identified you have to go to website to confirm which wires are what. Other lights I have purchased were tagged



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Exactly what I was looking for & super fast response along with shipping



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Great upgrade in brightness for my 2019 Keystone Cougar. Wiring was accurate. Always the only issue for me is clean caulking...but that's a me issue



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Added this to our Arcimoto that we converted to a flatbed. The electronics is driven by Pulse Width Modulation coding in an MRS Module and we don’t have the code. So we had to buy these with less draw (due to less LEDs). They work perfectly. The backups work perfectly (which it had none but the wiring was there). Probably the best lit Arcimoto in the world :) High quality. Fit in the grommet and bracket from another set of lights that had too much draw - so that shows these are very standard size. Pics show no backup, then backup. They are bright!



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These are a perfect replacement for the old lights on my Aliner. Had them wired up in not time. The only thing that presented a problem is that they mount flush. This means that the wires have to line up with wiring holes on a camper. With an Aliner there is one hole for each side, but they are offset to the right. My solution for this is to make risers with cutaways for the wires to run in to the offset holes. I'm using plastic cutting board material to make the risers.



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Great price, good quality. Worked great to rig up my RV receiver hitch toolbox with lights.



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Quick shipping and everything arrived in great condition. These are going to look great on the back of my 2005 Jeep TJ



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Love the super crisp color temperature and brightness and the reverse light. I've used a ton of Optronics products over the years and have never had one fail. I think these might be my favorite trailer lights yet!



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Awesome tail lights! Bright for brake lights and bright for reverse lights backing up



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Awesome tails much nicer updated look on my service truck


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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Dustin K
Video Edited:
Dustin K
Employee Wilson B
Updated by:
Wilson B
Employee Amanda K
Updated by:
Amanda K
Employee Justice A
Written by:
Justice A

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