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LED Combination Trailer Tail Light - Submersible - 8 Function - 21 Diodes - Square - Driver Side

LED Combination Trailer Tail Light - Submersible - 8 Function - 21 Diodes - Square - Driver Side

Item # STL3RB
Our Price: $28.95
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Shipping Weight: 0.82 lbs
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6-1/8" x 4-9/16" Square. Waterproof LED tail light acts as brake, tail, turn, side marker, side reflector, rear clearance, rear reflector, and license plate light for trailers over 80" wide. Stud mount - includes hardware. 23 Diodes. Great Prices for the best trailer lights from Optronics. LED Combination Trailer Tail Light - Submersible - 8 Function - 21 Diodes - Square - Driver Side part number STL3RB can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (69)
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Optronics Trailer Lights - STL3RB

  • Tail Lights
  • Square
  • LED Light
  • Red
  • 6L x 4-1/2W Inch
  • Surface Mount
  • License Plate
  • Rear Clearance
  • Rear Reflector
  • Side Marker
  • Side Reflector
  • Stop/Turn/Tail
  • Non-Submersible Lights
  • Optronics

6-1/8" x 4-9/16" Square. Waterproof LED tail light acts as brake, tail, turn, side marker, side reflector, rear clearance, rear reflector, and license plate light for trailers over 80" wide. Stud mount - includes hardware. 23 Diodes.


  • Square LED combination tail light serves 8 functions on trailers over 80" wide
    • Stop, tail, turn, side marker, side reflector, rear clearance, and rear reflector
    • Built-in license plate light illuminates trailers license plate
  • Sonically sealed, waterproof housing and lens unit is submersible
  • Built-in reflector removes the need for a separate reflector
  • LEDs make great replacements for incandescent lights
    • Last 50 times longer
    • More efficient - provide brighter light with less power output
    • No bulbs to replace - no brittle filaments
  • Durable plastic housing
  • Red acrylic screw-on lens
  • Compatible with 12V DC systems
  • Stud mounts to trailer with included studs
  • 3-Wire design hardwires to trailer
  • DOT compliant


  • Configuration: driver side
    • Passenger side: STL2RB (sold separately)
  • Dimensions: 6-1/8" long x 4-9/16" tall x 2-7/8" thick
  • Distance between mounting studs (center on center): 2"
  • Diodes: 21
  • Power draw at 12.8V:
    • Stop/turn: 0.268 amps
    • Marker: 0.059 amps
  • Lifetime warranty on LEDs

Optronics STL3 Series LED Combination Tail Light Dimensions

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.

Combination Lights for Trailers Over 80" Wide

Flatbed trailer over 80" wide with combination tail lights

If a trailer is 80" or wider at its widest point, then it requires rear clearance lights in addition to basic trailer lights. These clearance lights indicate the width of the trailer when it is viewed from the back.

To meet these requirements on a flatbed utility trailer where the bed extends past the wheels, you can install combination trailer lights that include the rear clearance function. For proper mounting, the lights must be installed at the widest points on the rear of the trailer - one on each corner.

STL3RB Optronics LED Combination Tail Light for Trailers Over 80" Wide - Submersible - 8 Function - 21 Diodes - Square - Red Lens - Driver Side - Left Hand

Alternate part number: STL-3RB

California residents: click here

Customer Satisfaction Score:

Customer Reviews

LED Combination Trailer Tail Light - Submersible - 8 Function - 21 Diodes - Square - Driver Side - STL3RB

Average Customer Rating:  4.8 out of 5 stars   (69 Customer Reviews)

6-1/8" x 4-9/16" Square. Waterproof LED tail light acts as brake, tail, turn, side marker, side reflector, rear clearance, rear reflector, and license plate light for trailers over 80" wide. Stud mount - includes hardware. 23 Diodes.


works great and was a direct bolt on replacement for my tail light


Easy installation work just fine


Just received and installed this light today. Replaced 7 year old lights on my utility trailer hoping to not have to mess with light bulbs anymore. The light works as it should, it's nice and bright, arrived in a reasonable time frame, was packaged well, and hopefully will last. I have ordered many items from etrailer and have never had a problem.


Awesome product from an awesome store. Product arrived just as described. Packing was great and looks just like I expected them to from the web site. Will get them installed and reviewed further. Hopefully this time, some bonehead won't back into my trailer in the parking lot of the boat ramp. Thanks etrailer for the great service.



A year later and just as good as the day I installed them. Thanks


Great LED Light for Utility trailer use over 80 inches wide. Combination light saves the cost of a stand alone side marker / identification light.



LED lights work great, look good , are very bright and reliable. Very satisfied.


Exact replacement.


These fit Carryon trailers from [tractor store]. They are excellent bright lights. Unfortunately for me they aren't unbreakable, but I eventually cut that too-close Valencia orange tree down. Yes, a chainsaw was the solution to my trailer light "problem".


I bought these as a replacement for ones on a car trailer. The factory ones died after a few months.

The fit and look great.

I have ordered several lights and lenses from etrailer.

In stock, good price and fast shipping .. what more needs to be said.


They work great. LED's are such a good way to go for trailer lights.

Bruce T.


They are working great. I am a big fan of LED light for trailers.


Had a damaged light on my trailer and decided to go with LED this time, so I replaced both sides. Very easy to install. Wires were color coded and matched my harness. Looks and works great. I was not able to find the LED in 80" plus size in local store for some reason. Only could find the 80 and under model. etrailer came through for me. Would buy from them again.


Very well packed for shipping. Looks and feels like a high quality light. It is not as bright as I hoped though. I measured it with a lux meter at one meter distance. Readings were as follows: 200 lux for tail light and 425 lux for brake light. That is more than double my incandescent bulb lights which were poor. Our eye perceives light on a logarithmic scale though so double is not much. The leds have a narrow bandwidth of light which is much more annoying (attention grabbing), which is a big plus. The leds also are instant on, so no more warming up a filament to create a brake light. Overall it's a good light.


The LED trailer lights arrived as promised. It was easy to install and has been a huge improvement over the original lights installed by the trailer's manufacturer.


All ordered items worked great. Love the LED tail lights. Didn't have any problems fixing the trailer thanks to the many technical articles I found on etrailer. Not sure what happened with UPS shipping since I got notified that the parts had shipped on Saturday but didn't get them till Wednesday evening (paid extra for 3 day shipping), but definitely recommend ordering from etrailer.


I just installed and tested them. They installed quite easily.
They are nice looking and bright.
They seem to be well built.
We'll see how these are after a couple years.
My last set were also L.E.D. type (but not this brand).
I thought, barring any accidents, they would last many years.
They didn't.
They did last longer that the incandescent type though.
Vibration seems to be the biggest enemy for trailer tail lights.


My husband has a mowing business and needs his trailer about every day. When a light gets brakes or goes our he needs it replaced as soon as possible, therefore, I need to order a replacement from a company we can depend on.


Great replacement part. The extended side lamp makes it easy to see in side view mirrors looking back. Only wish the grounding wire was internal and tapped into the mounting screw.


Perfect replacement tail light for my t railer.



Its been a year and thousands of miles later, still working as it should. All lights still burning.


Does the job very well. The side marker extends out more than I like, but I understand that this is a design that replaces rear and rear side markers on over 80" wide trailers.


I bought LED lights (tail,stop,turn) for my car trailer. A great improvement over the old lights.


Haven't installed yet but seems to be great quality. I ordered from E trailer via telephone and Marcia went above and beyond answering my questions and even contacting the manufacturer to get the info I needed. Will definitely order from E trailer again!


Sent product to wrong address. Took almost two weeks. Got it in time so I could use for trailer. It was a brake light. So far working.


WIth very few boat launches in sea and salt waters the lamps lost more than 80% of the LEDs. I turned them in for replacement and received the new ones under warranty. Will test again to see if I got a bad batch initially only....


Direct replacement item.
Easy to locate
on line and order.
Quick order receipt and shipping info.
Delivered earlier than expected.
Good follow up - would order from again.


product selection is great


Great product ,the LED's light all the time unlike some others I had that lit when they felt like it.

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • How Waterproof is the Over 80" Wide, Square LED Trailer Tail Light # STL2RB
    The Over 80" Wide, Square LED Trailer Tail Light # STL2RB that you referenced is designed to be a submersible light. What that means is that once you got to the boat ramp you would want to disconnect your trailer wiring from your tow vehicle and then you could back your boat trailer into the water and the lights will be totally fine. The LEDs are sealed so that water would not get to them. This light would be exactly what you need. For the left hand side you would want part # STL3RB.
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  • Version of the License Plate Light part # STL2RB with License Plate Light Below it
    The matching drivers side light to the part # STL2RB which is part # STL3RB has the license plate light underneath it like you need.
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  • Drivers Side Light To Match Passenger Side STL2RB
    The driver's side light that matches the LED Combination Trailer Tail Light part # STL2RB is part # STL3RB. You do not want to flip the passenger side light upside down because it has a license plate light. I recommend to use the driver's side light.
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  • Replacement Trailer Taillights for 2020 Carry-On 6 ftx12 ft Dump Trailer
    I pulled up some pictures of the 2020 carry-on 6ftx12ft dump trailer online and based on what I could see the taillights are the part # STL2RB for the passenger side and # STL3RB for the driver side.
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  • Recommended Replacement Driver & Passenger LED Combination Trailer Tail Lights
    I don't see why you couldn't use the LED Combination Trailer Tail Light # STL2RB upside to replace your driver side light. The only thing that might be weird is how the light will mount to the trailer physically since you're using the passenger light on the driver side, other than that you should be fine. If all else fails, you could always just use the driver side light # STL3RB and not hook up the license light wire.
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  • Replacement Square Multifunction LED Tail Light for Towsmart 1400
    For a replacement passenger side tail light for your Towsmart LED light I recommend using the LED Combination Trailer Tail Light - Submersible - 7 Function - 18 Diodes - Square - Passenger Side # STL2RB because of the high quality you get with Optronics lights (check out all of the 5 star reviews). This light measures 6-1/8" long x 4-9/16" tall x 2-7/8" thick and is submersible, so it would also work on a boat trailer if that is your application. If you also need a driver's side light you...
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  • Optronics Replacement Combination Trailer Lights Passenger and Driver's Side
    Thanks for the picture. I found a great replacement tail light combo for you. I recommend the Optronics LED Combination Trailer Tail Light - Submersible - 7 Function - 18 Diodes - Square - Passenger Side item # STL2RB. And driver's side item # STL3RB. These are 6-1/8" x 4-9/16" Square. They are waterproof LED tail lights that act as brake, tail, turn, side marker, side reflector, rear clearance, rear reflector, and license plate lights for trailers over 80" wide. Stud mounted and they include...
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  • Recommended LED Trailer Lights to Replace Some Incandescent Trailer Lights on Large Trailer
    You absolutely can mix LED and Incandescent lights on your trailer. For your PM444 replacements, I recommend the Optronics Over 80" Wide, Square LED Trailer Tail Light, 7-Function, 18 Diode, Right Hand # STL2RB and Left Hand # STL3RB. The LED lights will draw less power and will also get rid of the bulb replacement hassle you mentioned. In rare cases you may experience hyperflashing with LED lights. If this happens when you install these lights, you can simply add a load resistor...
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  • Troubleshooting Trailer Tail Light Not Working On New Utility Trailer
    What you are experiencing is common with ground connection issues. Before you get new tail lights you will first want to find the ground connection. This is generally a screw or bolt that is mounted to the trailer. It is common for trailer builders to use the mounting hardware for the tail lights to make the ground connection. They often will not actually clean the paint off where the wire connector meets the frame and rely solely on the screw to carry the current. This is generally not...
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  • Does the Replacement Tail Light Lens # AL8RB-1G Go to a Light with License Plate Function
    The Replacement Tail Light Lens for STL2RB and STL3RB # AL8RB-1G is a replacement for both the Optronics Right Hand # STL2RB and Left Hand # STL3RB lights as is indicated by the title. The part # STL3RB does have the license plate light function built-in to it.
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  • Square LED Trailer Lights and 5-Way Wiring Harness for a Wesco Boat Trailer
    Over or under 80 means 80 inches of width. There are certain lighting requirements if the trailer is more than 80 inches wide. Trailers that are less than 80 inches wide can still use lights that are indicated as over 80 inch. Since you need a 5-way wiring harness I recommend getting the lights separately, # STL8RB and # STL9RB, and then getting # A25W5B for the harness. This is a 5-Way wishbone harness. That means that the running light pin has 2 wires for running lights on each side...
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  • Replacement Tail Lights For Peterson Tail Lights With SAE A1ST DOT On Lens
    We have both the Peterson Tail Light Driver Side # PM444L and Passenger Side # PM444 that match what you currently have. Or you can upgrade to LED with the Optronics LED Combination Trailer Tail Light Driver Side # STL3RB and Passenger Side # STL2RB
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  • Tow Dolly Replacement Lights
    For your old car dolly, you may be interested in the Replacement Driver's Side Fender for Roadmaster RM3477 Tow Dolly with Electric Brakes - Metal # RM-922004 and # RM-922005. For similar lights you can use the Peterson Square Trailer Tail Light, 7-Function, Left Hand # 432400 and # 432200. For light from the sides instead of reflectors, you can use the Over 80" Wide, Square LED Trailer Tail Light, 7-Function, 18 Diode, Right Hand # STL2RB and left hand # STL3RB.
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  • Replacement Lights and Trailer Harness for SnowBear Trailer
    To replace the wiring harness on your Snowbear trailer you can use the Hopkins Endurance 4-Way Flat Trailer Wiring Harness - 20' Long # HM48240, which is a nice option since it gives you running light circuits running down both sides; this will make wiring everything in easier. If you also want to replace the lights with LED lights, you will need to swap all lights on the trailer to avoid issues with combining LED and incandescent lights. To replace the tail lights I recommend using the...
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  • Fender and Trailer Light Recommendations for a 7 x 10 foot Utility Trailer
    After looking at all the lights you referenced you should be good for trailer lights on your 7 by 10 foot utility trailer. You might check your local DOT though just to be sure as regulations can vary by area. Single Axle Trailer Fender - 16 Gauge Steel - 13inch to 14inch Wheels # HP69VR Over 80inch Wide, Square LED Trailer Tail Light, 7-Function, 18 Diode, Right Hand # STL2RB Over 80inch Wide, Square LED Trailer Tail Light with License Plate Light, 8-Function, 23 Diode, LH # STL3RB LED...
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  • Options to Replace Square Tail Lights with LED lights for Over 80 Inch and Under 80 Inch Trailers
    If your trailer came with the square Peterson lights then you can use the Submersible LED Trailer Light Kit, # TLL9RK. The Over 80 designation that you see is a federal guideline for trailers that are over 80 inches wide, and extra lighting is required for these trailers. You should check federal and state lighting guidelines if you are not sure that your trailer has the correct lighting installed on it. At this time we do not have an LED version of the Over 80 inch square tail light...
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