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Optronics LED Trailer Tail Light - Stop, Turn, Tail - Submersible - 10 Diode - Oval - Red Lens
Optronics

Optronics LED Trailer Tail Light - Stop, Turn, Tail - Submersible - 10 Diode - Oval - Red Lens

Part Number: STL78RB
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$13.94
Retail:$30.15
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Trailer Lights STL78RB - Submersible Lights - Optronics
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7-9/16" x 3-5/16" Oval. 3-Function, waterproof LED light acts as brake, tail, and turn signal. Durable polycarbonate housing and lens. Surface mount with built-in flange - hardware not included. 3-Wire design. Great Prices for the best trailer lights from Optronics. Optronics LED Trailer Tail Light - Stop, Turn, Tail - Submersible - 10 Diode - Oval - Red Lens part number STL78RB can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (711)
  • Q & A (0)
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Optronics Trailer Lights - STL78RB

  • Tail Lights
  • Oval
  • LED Light
  • Red
  • 6-1/2L x 2W Inch
  • Surface Mount
  • Stop/Turn/Tail
  • Submersible Lights
  • Optronics

7-9/16" x 3-5/16" Oval. 3-Function, waterproof LED light acts as brake, tail, and turn signal. Durable polycarbonate housing and lens. Surface mount with built-in flange - hardware not included. 3-Wire design.


Features:

  • Red, oblong light functions as stop, turn, and tail light
  • Sealed, waterproof housing and lens unit
  • Corrosion resistant
  • 10 Super LEDs (Light Emitting Diode)
  • Flange mounts with four mounting holes in the center of each side
  • Wiring design contains lead wires and a ground wire to mount to all surfaces
  • Wire functions:
    • Red: Turn signal and brake
    • Black: Tail light
    • White: Ground


Specs:

  • 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
  • Diodes: 10
  • Power draw at 12.8V:
    • Stop/turn: 0.243 amps
    • Tail: 0.046 amps
  • Lifetime warranty on LEDs


Optronics STL78 Series Combination Trailer Tail Light 6 Inch Oval Sealed LED Light Surface Mount Diagram

Sonically Sealed, Waterproof Trailer Light

The waterproof construction of this light makes it ideal for use on trailers that may be submerged, like a boat trailer. The housing and lens are sonically sealed together to create a single unit, which means that water will not get into the light and damage the diodes or circuit board.


Surface-Mount Light

Surface mount light

Surface-mount lights install flat against the surface of the trailer, so a hole does not need to be cut into the trailer for the light. This type of light is installed using a flange or bracket that has mounting holes. And mounting hardware is used to secure the light to the trailer.



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




California residents: click here


Customer Satisfaction Score:


Customer Reviews

Optronics LED Trailer Tail Light - Stop, Turn, Tail - Submersible - 10 Diode - Oval - Red Lens - STL78RB

Average Customer Rating:  4.8 out of 5 stars   (711 Customer Reviews)

7-9/16" x 3-5/16" Oval. 3-Function, waterproof LED light acts as brake, tail, and turn signal. Durable polycarbonate housing and lens. Surface mount with built-in flange - hardware not included. 3-Wire design.

by:

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:

Very clean installation on my home-built e-tricycle carrier. Works perfectly. Nice and bright!



by:

Wasn't sure if this was the exact same light as the one that I had since my trailer light was totally destroyed. It did look like the one that was still in place. So I ordered it and it was shipped very quickly and it was an exact match to the one that was still attached. Thank You for having the exact replacement it's all installed and ready for my next trip

Etrailer Expert

Brooke M.

5/20/2024

Thats awesome to hear! Where are you all headed next?



by:

Exact replacement fit for my Homesteader trailer. Even the screw holes lined up.



by:

I bought these to replace similarly-sized ones that came OEM on my trailer and stopped working after water had somehow found a way inside the case. These have been wonderful. Easy to install and they just work



by:

Customer service was Awesome and light works Great Thank you



by:

AAron H. Was extremely helpful to me ensuring that the item I needed was available to be shipped out and received my order in 2 days. He is very personable and pleasant to deal with. I would order other items from etrailer as I have in the passed. Very good prices and items received quickly. I recommend them to everyone. Always a great experience.
I would definitely order again from Aaron H.!!!!



by:

Nice design and quality material make this replacement tail/brake light an easy upgrade. Best part is changing over to LED lighting..using less battery juice and eliminating incandescent bulb failure…Txs



by:

Service was Good and Light works Good



by:

Been dealing with this company for several years. As usual, great service and products.

Wcc

10/8/2024

Still working great.



by:

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:

This product was a perfect replacement for OEM. Installation was simple. Ordering process and delivery by eTrailer was spot on. I will definitely continue to utilize eTrailer for my future trailer repair and upgrade projects.



by:

These are good quality lamps at a great price. They're simple to install. A year later and they are still working as expected.



by:

It came when promised and the product performed perfectly

Etrailer Expert

Heather A.

9/24/2024

Roger that looks amazing! Thanks for the video.



by:

After figuring out what wires were what on my trailer and the lights everything works as it should.

Donald

2/17/2024

After a year everything is still working as it should.



by:

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.



by:

Great light, perfect fit on my trailer.



by:

As described, they arrived quickly and were easy to install. They could be a bit brighter, but I am sure there is a standard for that, which I may not be aware of.



by:

Great product and OEM replacement on my Sundowner 777 gooseneck horse trailer



by:

Easy install looks great on my trailer without needing to cut the oblong holes for the light. Only need to drill a small hole for the wires and the mounting screws.



by:

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:

Now that I'm finishing up on my Teardrop 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:

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:

After a year of use they still work great, and all the bulbs are still lighting up.



by:

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


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Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • Is There a Gasket for the Optronics LED Trailer Tail Light STL78RB?
    No, I am sorry Randy there is not. The Optronics LED Trailer Tail Light item # STL78RB has a built in flange but we do not have a gasket for it.
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  • Recommended Optronics Tail Light With 3-Prong Plug Attached
    I 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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  • Do Optrionics LED Trailer Light # STL78RB Come as a Set or Sold Individually?
    The Optronics LED Trailer Tail Light - Stop, Turn, Tail - Submersible - 10 Diode - Oval - Red Lens # STL78RB is a single light. If you want a set, you will need to change the quantity box on the product page when ordering. I've attached a photo of the dimensions of the light as well as the mounting hole locations to assist. You may also be interested in the accent ring # A78CB or reflector # A78RXB which snap on to cover the mounting screws.
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  • What Light Assembly Does Snap-on Reflector Ring # A78RXB Fit
    Although the Snap-on Reflector Ring, # A78RXB, will not fit the STL178 series lights like the Optronics GLOLight LED Stop/Turn/Tail Light # STL178RFPB, I do have a solution for you. Take a look at the Sealed, 6-1/2" Oval LED Trailer Stop, Turn and Tail Light, # STL78RB. This light was designed to be used with the reflector ring. I spoke with my contact at Optronics and they do not offer a reflector ring for the STL178 series lights. The lights look incredibly similar but the light you...
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  • Components Needed to Build a Trailer From Scratch with the Timbren Axle-Less System
    I would be happy to help you put together the components you need to build your own trailer and do my best to keep the weight down. You are off to a good start with the Timbren Axle-Less Trailer Suspension System - Spindle w/Brake Flange item # ASR1200S04. These weigh around 50 lbs. However, the brakes you linked item # 23-48 are for 7" hubs and we do not have any that will fit the Timbren systems so you will need to go up to 10" hubs and drums. I recommend the Dexter Trailer Hub and...
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  • Is the Optronics Light part # STL78RB Sold Individually or Separately
    The Sealed, 6-1/2" Oval LED Trailer Stop, Turn and Tail Light # STL78RB that you referenced is sold individually.
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  • Picture Request for the Snap-On Reflector Ring Installed on a Optronics 6-1/2 inch Oval Light
    I went out in to our warehouse and pulled a Optronics Trailer Light # STL78RB and a Snap-on Reflector Ring for STL78RB Series LED Lights # A78RXB to show you what they look like together. I attached a picture and a video I shot also.
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    Image 1 for
  • Amber Version of LED Stop//Tail/Turn Wesbar 273564
    Yes we do. You would want the part # STL22AB for an amber version of the light part number you listed. Another option is the part # STL72AB or part # STL70AB.
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  • Is the Optronics LED Trailer Tail Light item # STL78RB DOT Approved?
    Since the Optronics LED Trailer Tail Light item # STL78RB is red it can be used as a third brake light. This light is DOT approved and can also be used as a rear turn signal. To use it only as a third brake light you will want to wire the black tail light wire and the red stop/turn light wire to one circuit. The white wire is ground. If you are needing to add a turn signal on the side of your trailer you will want to use an amber light like the item # STL78AB. I have linked a review video...
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    Image 1 for
  • Availability of LED-Type Oval Trailer Stop/Turn/Tail Light
    We do offer many high-efficiency LED-type trailer stop/turn/tail lights in the 6-1/2 x 2-1/4-inch size of the Optronics # ST70RBTK that you referenced. All can be seen on the linked page. All lights shown are submersible. You can choose from either recessed mount lights like # STL22RB or surface mounts like # STL78RB.
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  • Can Clearance Lights be Installed on Side of Trailer as Additional Turn Signals
    The DOT rules are typically that if the turn signal is facing the side of the trailer it needs to be amber in color like the part # STL78AB and then if facing the rear it can be amber or red like part # STL78RB. However, if the light also carries the stop light circuit it would have to be red. You would need to check with your local DOT to confirm this, but in the meantime I attached a help article on trailer lighting options as well. To do what you are looking to do would require you...
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  • Optronics Oval LED Light Recommendation to Replace an Older Style Optronics Light
    I do have a solution that should work for you, but we do not carry any Optronics lights with the style connector you have. You could get a Optronics Trailer Light # STL78RB that you referenced, and to install it you would just want to cut of the connector that is on your trailer and then wire the the three wires to the wires of the # STL78RB. The white wire of the # STL78RB will run to the ground wire of your trailer wiring, the red will run to the turn signal/brake wire and the black...
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  • Can LED Trailer Stop, Turn, and Tail Lights be Installed on Guide Posts on a Boat Trailer
    Technically 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.
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  • Comparing Oval 6-1/2" Trailer Tail Lights Red or Clear Lens
    In regards to using a trailer tail lights with clear lens like part # STL88RCB or red lens like part # STL78RB, this will come down to local laws and regulations concerning trailer tail lights. There are certain areas where using a trailer tail light with clear lens is illegal but this is not true for all areas so you will need to check ahead. That said, you would most likely not run into any trouble using either although the red lens is much more common.
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  • How Does the Optronics Trailer Lights # STL78RB Wire to the Passenger Side of a Trailer
    On the right side of your trailer the green wire should be the right turn/stop signal and the brown should be the running or taillights. So basically the brown of your trailer should run to the black of the light, the green of your trailer should run to the stop/turn signal, and the white should run to the white. If that is how you wired it up on your trailer and you are still having problems when the headlights are on that would indicate you have a ground issue. What you will want to...
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  • Picking Out Replacement Trailer Taillights for 2009 Cargo Pro Trailer
    I tried pulling up pictures of your 2009 Cargo Pro Trailer on Google and from what I was able to find it looks like your trailer uses taillights like the # TLL12RK which are a recessed mount that come with a grommet. So for a single light you'd want the part # STL72RB with the grommet # A70GB and if you need a pigtail harness part # A47PB. If you have something different email be back a picture and I'll see what is the best match for it.
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  • Clearance Light Recommendation that Can Be Used for Running Light and Stop Circuit
    In order for a side marker light to be used as a blinker and a running light it will need to be a dual intensity bulb that has a dimmer output for running lights and a brighter output for the blinker circuit. Most clearance lights only have a single intensity so you would have to go with either a different light for the running lights or swap to a light that can do both. Something like the part # STL78RB would work.
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  • Availability of 6 Inch Long Oval Red and White Light Assemblies
    The closest options we have available to what you are looking for are the Red GloLight LED Trailer Light # STL111RB and the White GloLight LED # BUL111CB. Both light assemblies can be paired with the PVC Grommet # A70GB and feature a sonically sealed, waterproof housing and lens that is submersible. The red light assembly can be used with the 3-Wire Pigtail # A47PB and the white assembly will work perfectly with the 2-Wire Pigtail # A49PB. The light assemblies measure 6-1/2 inches long,...
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  • Recommended Lights for Aluminum Cargo Carrier on a 2012 Mercedes-Benz ML550
    What I recommend installing is the Optronics LED Trailer Tail Light # STL78RB on either side of your cargo carrier. Then for your connector use the Wesbar Wishbone Wiring Harness # 002402 with the Hopkins Adapter # 47345 so it is compatible with the 7-Way on your 2012 Mercedes-Benz ML550. The wiring configuration for the Wesbar wishbone is as follows: White - ground wire Yellow - left turn/brake light Green - right turn/brake light Brown - tail lights For extra wiring use the Bonded 4...
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  • Troubleshooting Trailer Running Light Circuit Not Functioning on One Side of Trailer
    Since your running light issue is only on one side of the trailer that indicates that the issue is on the trailer wiring. Most likely you have an insufficient ground on the light assemblies on that side of the trailer. If you can fix/improve the ground on that side of the trailer you will fix the issue you are having. A lot of trailer lighting assemblies ground through the mounting hardware of the light so make sure your lights are mounted to a clean metal surface. You can also run jumper...
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  • Recommended LED Tail Lights For 2017 Alto Safari Camper Trailer
    I understand why you want to add additional lights on your camping trailer. I recommend part # STL78RB. This is an oval 6-1/2 inch LED light with the stop, turn, and tail light function. LED lights require much less power than incandescent lights. These are surface mount lights that have an overall measurement of 7-9/16 inches long, 3-5/16 inches wide, and 3/4 inches deep. This is a three-wire light. The wires have the following functions: Red for turn signal and brake, Black is for tail...
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  • Troubleshooting Trailer Left Turn Signal Light That Does Not Blink
    Its usually easiest to disconnect the trailer from the vehicle and test the trailer functions directly by connecting 12V power from the vehicle (or another) battery right to the various circuits on the trailer plug. This way of testing isolates the trailer from any issues that might be present in the vehicle wiring, such as a mis-wired connector. If you do this and the trailer light does not do what it is supposed to do, then check both your main trailer connector ground and the problem...
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  • 4-Pole Trailer Wiring Functions & Wiring Installation for Optronics Oval LED Trailer Light STL78RB
    In standard 4-pole trailer wiring there are actually three active lighting circuits plus a ground. The tail light (or running light) function is carried on the (usually brown) wire that is next to the ground pin. Please refer to the linked photo of a trailer-side 4-pole connector that shows these circuit/function assignments. The next pin over, the one for the yellow wire, typically carries the LEFT stop and turn light functions which are combined onto this one wire; and the RIGHT stop...
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    Image 1 for
  • Are Load Resistors Required When Installing LED Lights on a Trailer
    You 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.
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