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Optronics LED Trailer Tail Light - Stop, Turn, Tail - Submersible - 10 Diode - Oval - Red Lens
(2267 reviews)
Price: $15.42
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Optronics LED Trailer Tail Light - Stop, Turn, Tail - Submersible - 10 Diode - Oval - Red Lens
Part Number: STL78RB
In Stock
$15.42
Retail:$17.23
You Save: 11%
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- All Info
- Reviews (2267)
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Optronics Trailer Lights - STL78RB
Highlights
- One Light, 3 Functions: Acts as stop, turn, and tail light so you get full signaling in one unit.
- Reliable In Any Weather: Sonically sealed waterproof housing keeps water from damaging LEDs.
- Fewer Replacements Needed: 10 super LEDs draw less power and last longer than bulbs.
- Simple Surface Mount: Built-in flange with 7" x 2-3/4" bolt pattern installs flat, no cutout needed.
- Low Power Draw: Uses only 0.243A on stop/turn and 0.046A on tail for efficient operation.
- Road Legal: DOT approved red lens keeps your trailer compliant and visible.
Features to know about
Brighter Lighting Without the Bulb Hassle: 10-Diode LED System
If you’re done with dim bulbs or replacing filaments, this 7-9/16" x 3-5/16" oval LED light is a definite step up. It uses 10 super-bright LEDs that handle stop, turn, and tail functions in one sealed unit. With a power draw of just 0.243 amps for stop/turn and 0.046 amps for tail at 12.8V, it shines bright while keeping current demand way down. The result is clean, reliable light every time you hit the brakes or flip your turn signal—no bulb changes needed.
Keeping Water Out Where Others Fail: Fully Sealed, Waterproof Design
Water damage is one of the fastest ways to kill a light, but not this one. The housing and red polycarbonate lens are sonically sealed into a single waterproof piece. That means no moisture sneaks in to fog the lens or corrode the diodes. Whether you’re on wet roads or backing into the water, the light stays clear, bright, and protected.
Quick Mounting That Fits Flush: Surface-Mount Flange Setup
No need to cut big holes or fight with odd brackets. This flange-mount light installs flat against any surface using four mounting holes spaced 7" apart horizontally and 2-3/4" vertically (center to center). Just line up your spots, bolt it on, and you’re set. The low-profile 3/4" thick body keeps it tucked in tight so it won’t snag or catch on anything.
Simple Wiring That Just Works: Three-Wire Hookup
The wiring layout couldn’t be easier. Red handles turn signal and brake, black runs the tail circuit, and white is ground. The design makes it easy to adapt to almost any trailer wiring layout without special connectors or adapters. Once wired in, you’ve got dependable lighting that meets DOT standards and keeps your rig visible from every angle.
Specs
Dimensions
- Overall dimensions: 7-9/16" long x 3-5/16" tall x 3/4" thick
- Distance between mounting holes (center to center): 7" long x 2-3/4" tall
- Overall dimensions: 7-9/16" long x 3-5/16" tall x 3/4" thick
- Distance between mounting holes (center to center): 7" long x 2-3/4" tall
Electrical Specifications
- Diodes: 10
- Power draw at 12.8V: Stop/turn: 0.243 amps; Tail: 0.046 amps
Warranty
- Lifetime warranty on LEDs
STL78RB Sealed, 6-1/2" Oval LED Trailer Stop, Turn and Tail Light, Flange Mount, 10 Super Diode 0.243V/0.046A
Alternate part number: STL-78RB
Customer Satisfaction Score:
99% were satisfied with this product
1% of customers were not satisfied
- Product did not meet expectations
- Wrong item was ordered
- Did not arrive in time
Ratings & Reviews
4.8
2267 reviews
by:
Matt G
06/29/2024
Light was the same size as previous one on EZ Loader boat trailer. Easy to install and very bright. Original one made it 10 years and had moisture inside causing most of the LEDs to stop working.
by:
Marvin
10/28/2026
Product arrived as promised they are perfect lights that I ask for ,high quality Led and easy installation,great customer service,
by:
Gail
06/27/2026
Perfect fit. Installation took longer than it should due to very poor previous repair performed at the dealer. Glad I chose, at 73 swf, to do rhe work myself. The first time I have had fully functional tail lights since buying in 2022. Woo hoo.
by:
William
05/31/2026
I just installed the new trailer lights on our Sundowner horse trailer. The lights are of good quality and replaced the original lights no fabrication needed. The wiring matched up well with the existing wiring.
by:
Randall
08/16/2026
Perfect fit, fast delivery,great customer service from ETrailer.
by:
Ronnie
06/10/2026
Great product. An exact copy of what I had installed on my enclosed trailer. It was an easy install with color matching wires. Great quality, easy install and an excellent price point. Can’t go wrong here folks.
by:
Karen
05/09/2026
The lights were easy to install. They are bright lights, very visible in the sunlight.
We installed these on our older dump trailer, replacing the old lights.
They fit perfect, and look and work great.
We installed these on our older dump trailer, replacing the old lights.
They fit perfect, and look and work great.
by:
Scott Cushing
05/16/2025
2018
Grand Design
Solitude Fifth Wheel
Replacing original tailights on 2018 camper.
Scott C.
5/17/2026
After 1 year, lights have worked great! Still bright as when I installed them. No condensation behind the lens or other problems. I would buy again!
Lazer S.
5/18/2026
@ScottC Nice! Glad to hear they are still working well for you! Were the lights you replaced fogging up or just old and worn out?
by:
Javier
03/25/2026
Subaru
Outback Wagon
The Optronics LED lights fit perfectly on my 2021 Keystone Outback. Installation was easy. It took longer to remove the old sealant.
by:
Wayne
03/24/2021
After one of the the incandescent trilights the factory installed on my trailer burnt out I discovered they where sealed and the bulbs could not be replaced,
So I purchased two of these and discovered they are ery nice lights and unlike incandescent lights they don't screw up the turn signal flash rate.
I am now in the process of rebuilding a trailer mounted generator and just ordered 2 more of them for that trailer and I also bought LED marker lights from the same manufacturer.
If you need new or replacement taillights or marker lights LED's are the way to go, long lasting, nice and bright and in my opinion they way they instantly light up get more attention from drivers behind me possibly reducing the chances of getting my trailer rear ended by a inattentive driver.
So I purchased two of these and discovered they are ery nice lights and unlike incandescent lights they don't screw up the turn signal flash rate.
I am now in the process of rebuilding a trailer mounted generator and just ordered 2 more of them for that trailer and I also bought LED marker lights from the same manufacturer.
If you need new or replacement taillights or marker lights LED's are the way to go, long lasting, nice and bright and in my opinion they way they instantly light up get more attention from drivers behind me possibly reducing the chances of getting my trailer rear ended by a inattentive driver.
by:
Kathryn
10/13/2021
The 10-diode tail lights were well made, bright, and easy to install. We also ordered and installed the matching reflector rings, which were also easy to install, look great, and give added safety features.
Kathryn
10/14/2022
Lights are sleek and a perfect replacement. Still doing an excellent jodb! Would purchase again if needed.
by:
Don M.
09/23/2012
Trailer I've got these lights installed, along with a LED tag holder, and LED marker lights. I had also bought the fenders from etrailer they look great, and I get a lot of comments how good all these parts look. Oh and the prices are better then any place I could find.......Thanks etrailer
by:
Dave D
05/30/2017
I bought one of theses lights last year to replace one that had some of the LED's going out. Same manufacturer and same part number. The new light uses a different type of LED (square LED). The old style used an LED that looks more like a small bulb. I have 4 of these on the back of my 5th wheel trailer. The other three started going bad so I just replaced them as well. I have other LED lights inside the trailer that use the same type of LED as the new tail lights. I've had those lights for 6 years with no problems. . I suspect these new lights will last much longer with the new type of LED.
by:
BH
01/29/2017
Wired them in and they light up, blink, and do everything else they're supposed to do. Let me also mention that they are BRIGHT at night. Loading the boat onto the trailer at dusk/after dark they're almost blinding when the pickup driver steps on the brakes. Lol
by:
Darrell
03/05/2026
Perfect replacement for the til lights on my trailer. Thank you etrailer for having what I needed, and the detailed information to know it was the right part to order.
by:
Brian
06/17/2019
Good product. Horizontal bolt hole spacing is the same as a license plate so it conveniently mounts anywhere a license plate would. The LEDs are bright enough as auxiliary running/turn/brake lights and the wiring is simple. The mounting flange is not very strong plastic so you have to be careful not to crank down on the mounting bolts. There is no hardware included and no gasket for the backside, which is a bummer. Otherwise, a very nice product.
by:
Kenneth
10/06/2026
the lights look and work great.
by:
Sean
05/23/2018
I had a hitch carrier in the garage and wanted to add brake lights/turn signals. Since there were no mounting locations for lights, I needed a surface mount option. These fit the bill. They work great and were easy to wire with the harness I bought.
by:
RAM
12/12/2017
Worked great as a replacement for OEM that was no longer available for RV. I also replaced the back side marker lights so the front and back matched.
Pat C did a great job in completing my order with substitution for out of stock resistor.
Pat C did a great job in completing my order with substitution for out of stock resistor.
by:
Phil
10/26/2026
It was an exact match for what was being replaced.
by:
Robert
09/04/2026
replacement on an older truck camper. Fit perfectly!
by:
Brooke
07/24/2022
Very nice product. Installation on my very old utility trailer was easy. I like the slim design compared with my old chunky incandescent lights which were easy to break and not as bright as these LEDs.
by:
Jack
06/10/2018
Quality product well made and designed,
Reasonably priced. Best suited for my application. Also purchased the red reflector snap ring that covers the mounting flange and screws.
Reasonably priced. Best suited for my application. Also purchased the red reflector snap ring that covers the mounting flange and screws.
by:
Chris
03/24/2025
This has been a very good product. The light was easy to order and install. I have not had a problem with it working properly and I expect it to keep working for years to come.
Chris
3/27/2026
After a year the light is still working even with the trailer sitting out in all kinds of weather. This is a very good product.
Gwendolyn Y.
3/27/2026
@Chris Glad the light is still shining bright for you, Chris!
by:
Chantelle
03/09/2026
Part was exactly what we needed. Shipping was quick - Thanks!
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view full answer... - Are Load Resistors Required When Installing LED Lights on a TrailerYou will not need to add any diodes or other modules to prevent hyperflashing or any other bizarre taillight behavior when you install this Optronics Tail Light # STL78RB on your trailer. If you were installing LED tail lights on a vehicle and replacing the lights on the turn signal circuit then you would need a load resistor so that the blinkers would function correctly.
view full answer... - Can LED Trailer Stop, Turn, and Tail Lights be Installed on Guide Posts on a Boat TrailerTechnically you could install LED tail light # STL78RB wherever you wanted. I haven't seen stop, tail, and turn lights on guide posts but I'm sure it can be done. If you just want lights on the guide posts to make them easier to see then there are lights just for that, # CE27656A. They fit on 2 inch diameter posts. You might also be interested in some conspicuity tape such as # 465-4K.
view full answer... - Recommended Optronics Tail Light With 3-Prong Plug AttachedI do have options for you. We have the Optronics # STL78RPG, which is essentially the Optronics LED Trailer Tail Light # STL78RB with a 3 prong attached. We also have the GloLight LED Trailer Tail Light # STL178RFPB. This light is identical in size to the light you mentioned, and will come with the 3 prong plug attached. The only difference is that the # STL178RFPB is a 22 diode instead of a 10 diode, so it will be a brighter light.
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Matt G.
6/30/2025
Submersible light is still working properly. Good product for the price.