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Optronics LED Trailer Tail Light - Stop, Turn, Tail - Low Profile - Submersible - 10 Diodes - Oval
Optronics

Optronics LED Trailer Tail Light - Stop, Turn, Tail - Low Profile - Submersible - 10 Diodes - Oval

Part Number: STL78RLPB
In Stock
$25.49
Retail:$39.66
You Save: 36%
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In Use/Installed

7-9/16" x 3-5/16" Oval low-profile lens. 3-Function, waterproof LED light acts as brake, tail, and turn signal. Surface mount with built-in flange. Accepts industry standard PL-3 plug. Great Prices for the best trailer lights from Optronics. Optronics LED Trailer Tail Light - Stop, Turn, Tail - Low Profile - Submersible - 10 Diodes - Oval part number STL78RLPB can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (2202)
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  • Videos (2)
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Optronics Trailer Lights - STL78RLPB

Highlights

  • One Light, 3 Functions: Acts as stop, tail, and turn signal for clear rear visibility.
  • Reliable In Any Weather: Sonically sealed housing keeps water out even when submerged.
  • Fewer Replacements Needed: LEDs last up to 50 times longer with no fragile filaments.
  • Simple Flat Mounting: Surface design with built-in flange means no hole cutting required.
  • Low Power Draw: Uses only 0.243 A for stop/turn and 0.046 A for tail at 12.8 V.
  • Easy Wiring Setup: Accepts industry-standard 3-prong PL-3 plug for quick connection.

Features to know about

Brighter, Longer-Lasting Lighting: 10-Diode LED Tail Light

Rectangular red trailer tail light with clear license plate light section and durable plastic housing, shown for product identification and trailer lighting replacement parts.

This low-profile oval light delivers bright stop, turn, and tail signals using 10 LEDs that last up to 50 times longer than old-school bulbs. Each diode runs cool and efficient—drawing just 0.243 amps on stop/turn and only 0.046 amps on tail at 12.8V. No filaments to break, no bulbs to swap, just a clean red light that stays bright every time you hit the brakes. It’s dependable visibility that won’t fade or flicker with use.

Water and Weather Are No Problem: Fully Submersible Design

When water exposure is part of the job, this light is built to handle it. The housing and lens are sonically sealed into one waterproof piece, so there’s no path for water to get in and damage the LEDs or circuit board. Whether it’s rain, washdowns, or full submersion, the sealed construction keeps everything protected and working like new.

Smooth Fit Installations: Surface-Mount with Built-In Flange

Amber rectangular LED trailer light with clear lens and two-wire plug connector, shown from a side angle to highlight compact, weatherproof design for trailer lighting applications.

Installing this light is simple thanks to its flat-mount design. The built-in flange lets you secure it right against the trailer surface—no need to cut holes or recess it. It measures 7-9/16" long by 3-5/16" tall and only 9/16" thick, giving you a clean look without bulky protrusions. Just mount it flush, connect your plug, and you’re done.

Quick Wiring Setup: Standard PL-3 Connection

Wiring is straightforward with the industry-standard PL-3 connection. It accepts a 3-prong plug (sold separately), so you can tie into existing trailer wiring without splicing or guessing at connections. That means fewer tools, faster setup, and a plug-in fit that’s reliable for the long haul.

Specs

Dimensions

  • Overall dimensions: 7-9/16" long x 3-5/16" tall x 9/16" thick

Electrical

  • Power draw at 12.8V (Stop/turn): 0.243 amps
  • Power draw at 12.8V (Tail): 0.046 amps

Lighting

  • Diodes: 10

Warranty

  • Lifetime warranty on LEDs

STL78RLPB Optronics LED Trailer Tail Light - Stop, Turn, Tail - Low Profile - Submersible - 10 Diodes - Oval - Red Lens





Video of Optronics LED Trailer Tail Light - Stop, Turn, Tail - Low Profile - Submersible - 10 Diodes - Oval
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 Ultimate Overview of the Optronics LED Trailer Tail Light-STL78RLPB

Hi, everyone. Aiden here with etrailer.com. And today we're gonna be taking a look at this low profile Optronics LED detail light. Let's get started. Like the name suggests, this is going to be very low-profile. Compared to some of the other options that mount in a similar fashion, this sticks up far less than the other options, even some other options from Optronics.

So if you want that low profile look, this is a great way to go. You're gonna get all your typical taillight functions such as your running light like we see here, our turn signals, and our brake lights. And those LEDs are going to be much more power efficient, last a lot longer and be a better alternative to maybe the incandescent bulbs you have on your trailer. It's all gonna work out really well. And it's gonna be plenty bright for others to see on the road.

Now, everything from the lens to the outer flange here, is going to be a nice polycarbonate construction. It's going to be fairly impact resistant. So if there are any rocks or anything flying up on the road that might hit this, I don't think you'll have to worry about it. This outer flange here also contains our four mounting locations. We just had two existing holes in the top and bottom our trailer today.

And you will need to pick up your own mounting hardware so you can mount it however you see fit. Just make sure you pick up that hardware that you need. Everything is sonically sealed. So that means it's going to be water resistant and even submersible. So if you do plan on putting this on something like a boat trailer, where it's gonna be in and around water, you're not gonna have to worry about it.

As far as installation goes it is gonna be pretty straightforward. Like I mentioned before, you will need your own hardware, or just reuse your old hardware depending on what you're replacing. And because it has that industry standard PL3 plug on the back, it's a whole plug-and-play system. If you don't have that plug on your trailer already, you can pick that piece up here on our website and install it onto the trailer end. But otherwise, let's check out how we did the install. We'll start our installation off by removing our old light. The one we have here is just attached with this grommet piece here. So I'll get a plastic trim panel tool and use that to pry up around the edges until we can get that out of the housing here on the trailer. Kind of working our way around like this. Once we have it removed, we can come around back to our PL3 plug and unplug it and then go and grab our new light. Now we can take our new light, and since it has that PL3 plug already on it, we can just plug it into our existing system. Now, if you don't have this on your trailer, you maybe had something that was hardwired before, you can pick up this piece separately and install it. Otherwise, you can just plug that in. And then we can add all the wires in here and mount up our light using the existing holes we have on our trailer on the top and bottom. You will need to pick up your own hardware. Luckily, we've got some on hand here. So just use that to attach the light here. Once everything is attached and plugged in we can go ahead and test our lighting functions. Starting with our taillights, our turn signal, and the brake lights. Once we've verified that everything on here is working we can go ahead and hit the road. And that'll do it for our look at this Optronics low-profile LED detail light. Thanks for watching..

Customer Satisfaction Score:

Ratings & Reviews

4.8

2202 reviews
5 Stars
(1901)
4 Stars
(205)
3 Stars
(46)
2 Stars
(19)
1 Star
(31)
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7-9/16" x 3-5/16" Oval low-profile lens. 3-Function, waterproof LED light acts as brake, tail, and turn signal. Surface mount with built-in flange. Accepts industry standard PL-3 plug.

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As expected!



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Just what I need fast delivery



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All good



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They look great



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Will be ordering more



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Delivered very quickly



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These lights are well made and looks gr eat!



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Works great



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still working fine.



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These work also.



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Great product at a Great price.



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Excellent product. Highly recommend. Received in two business days. Tracking information is a valuable tool.
Mathew was very helpful.



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Fast shipping, just as described, just what we needed to get our customer back on the road.



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They had a hard to find trailer light that was an exact match to my boat trailer



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As usual, Etrailer for the win! Truck light went out, we went to 6 different stores with no luck but found it at Etrailer. Exact match and lightning fast delivery. Thanks!



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These were OK. They are not as bright as the OEM tail lights that came on the travel trailer.



by:

etrailer.com always has what I am looking for. These LED lights are perfect for my trailer, and an exact replacement.



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They are a perfect replacement for the lights that came originally on the trailer. So easy to install and plug in. Thanks to etrailer for being the only site where I was able to find them. And etrailer customer service was excellent in shipping them immediately and quickly. Also, their customer service both directly after ordering and after receiving the lights was exceptional with emails keeping me informed of the order and asking whether they could be of more help after the lights arrived.



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They helped me find the exact item I needed! Great communication and service!



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This product was exactly as described and worked perfectly. The assistance I got from eTrailer was incredible! Original order was lost by USPS and they resent the product and took on the onus of tracking down the lost package. Highly recommend this site!



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Great service ,person who took my order got the exact part i needed


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See what our Experts say about this Optronics Trailer Lights


Info for this part was:

Employee Jameson C
Expert Research:
Jameson C
Employee Jacob T
Video Edited:
Jacob T
Employee Cole B
Installed by:
Cole B
Employee Aidan B
Installed by:
Aidan B
Employee Daron K
Edited by:
Daron K
Employee Brian T
Written by:
Brian T
Employee Noah M
Updated by:
Noah M
Employee John S
Video by:
John S

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