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LED Tail Light for Trailers Over 80" Wide - 8 Function - Submersible - 23 Diodes - Driver Side

LED Tail Light for Trailers Over 80" Wide - 8 Function - Submersible - 23 Diodes - Driver Side

Item # STL37RB
Our Price: $42.94
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Shipping Weight: 0.92 lbs
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7-7/8" x 3-1/4". Waterproof light acts as brake, tail, turn, side marker, side reflex reflector, rear clearance, rear reflex reflector, and license plate light for trailers wider than 80". Surface mount. 3-Wire pigtail. PC Rated. Great Prices for the best trailer lights from Optronics. LED Tail Light for Trailers Over 80" Wide - 8 Function - Submersible - 23 Diodes - Driver Side part number STL37RB can be ordered online at or call 1-800-940-8924 for expert service.
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Optronics Trailer Lights - STL37RB

  • Tail Lights
  • Rectangle
  • LED Light
  • Red
  • 8L x 3W Inch
  • Surface Mount
  • License Plate
  • Rear Clearance
  • Rear Reflector
  • Side Marker
  • Side Reflector
  • Stop/Turn/Tail
  • Submersible Lights
  • Optronics

7-7/8" x 3-1/4". Waterproof light acts as brake, tail, turn, side marker, side reflex reflector, rear clearance, rear reflex reflector, and license plate light for trailers wider than 80". Surface mount. 3-Wire pigtail. PC Rated.


  • Rectangular trailer tail light provides stop, turn, tail, and license light functions
    • Built-in side marker and rear clearance light with reflex reflectors
  • Sealed, waterproof construction is submersible
    • Light is designed specifically for boat trailers
  • 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
  • Plastic housing
  • Red acrylic lens
  • Mounts on surface of trailer - hardware included
  • 3-Wire pigtail
    • White wire is for ground
    • Brown wire is for the tail lights
    • Yellow wire is for the stop and turn lights
  • PC rated light produces a 180-degree beam pattern
  • DOT compliant


  • Configuration: driver side
    • Passenger side: STL36RB (sold separately)
  • Dimensions: 7-7/8" long x 3-1/4" tall x 2-7/8" deep
  • Diodes: 23
  • Power draw at 12.8 volts:
    • Stop/turn signal light: 0.181 amps
    • Side marker light: 0.047 amps
  • Lifetime warranty on LEDs

Optronics STL37RB LED Combination Tail Light Dimensions

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 circuit board is sealed, which means that water will not damage the diodes or circuit board.

PC-Rated Lights

Diagram of light spread for PC rated light

A PC-rated light produces a 90-degree angle of light to either side of its centerline for a total of 180 degrees of coverage. This beam pattern can be clearly seen when you are standing directly in front of the light, as well as when you are standing on either side of the light. When properly installed, this type of light can function as both a front clearance light and a side marker light or as a rear clearance light and side marker light.

STL37RB Optronics Combination LED Taillight for Trailers More Than 80" Wide - Red Lens - Left Side

Alternate part: STL-37RB

California residents: click here

Customer Satisfaction Score:

Customer Reviews

LED Tail Light for Trailers Over 80" Wide - 8 Function - Submersible - 23 Diodes - Driver Side - STL37RB

Average Customer Rating:  4.9 out of 5 stars   (579 Customer Reviews)

7-7/8" x 3-1/4". Waterproof light acts as brake, tail, turn, side marker, side reflex reflector, rear clearance, rear reflex reflector, and license plate light for trailers wider than 80". Surface mount. 3-Wire pigtail. PC Rated.


Product is well built, the packages got here a day ahead of schedule which helped me get the units installed in my boat trailer ahead of a trip I was planning to take. The lights fit tightly in a custom molded area of my fenders. The website directed me to these LED lights as a replacement for the old 1057 bulb type lights.


LED trailer tail lights are the only way to go for good lighting! I’ll definitely come back to ETRAILER for my future trailer supplies!


It was a direct replacement for a damaged tail light and works perfectly.


In use over a year now with no issues. Nice and bright on my boat trailer that I use 40 plus times a year.


Perfect fit for my trailer. Nice bright lights. Thanks for a great product.


This light was a direct replacement for the left side of my 23 foot trailer. Light was ordered, shipped, and installed in 3 days. Worked perfectly.
Just a word to the wise though. Even though the light is rated submersible, one should always disconnect the trailer power cord before launching boat, and wait 15 minutes after recovery before reconnecting. Just good practice.

Chris S.


Yes, the lights still work great. Thanks for asking.


LED lights are bright. The lights fit well onto my boat trailer.
Hopefully they will outlast other sealed lights previously installed.
Submersible lights should last a long time. I hope these do and don’t leak water.
Time will tell, as they have not been tried by me.



Lights are working very well on the boat trailer. No failures which is good.


OK, so I broke one of these cool Aero LED lights on my utility trailer. Ground guide said, "C'mon back!," so I did. Bummer. The good news is etrailer always comes through and at a good price and fair shipping rates, so I'm already (legally) back on the road. It's nice to find a company that does more than say they care: etrailer delivers. I'll be back (but I hope not TOO soon). :-)



I sold that trailer to a friend a few months ago, but I saw it just last week. We used it to haul some landscaping materials, and I noticed it had another broken light, so I told him about I imagine youll be hearing from him soon.


Replaced the original tail lights on my boat trailer. Exact match for size, mounting. Wired easily, so much brighter.

Joe R.


Super - no more bulbs getting wet and blowing


Product was as described on web site. Exact replacement and easy to install. Best price of any I looked at on line and you were lower than all others (including the shipping) than any other price for just the light.
I will definitely buy from you again when I need trailer parts.

Larry W.




Great replacement light for older Ranger Boat Trailers. Before the round led lights for the fiberglass fenders there was a Wesbar #105826. Can't find them anymore so etrailer recommended these lights as a replacement. They fit in the fender pretty well. I did have to drill new holes for the mounting bolts lower than the original, no biggie. The visibility is vastly superior to the old incandescent bulbs. You'll probably wonder why you hadn't changed them out sooner as I did. Ordered a pair, first shipment had one broken in it, etrailer sent me a new one quickly and emailed a return label. Communication was quick and pleasant. Highly recommend these folks, have dealt with them previously and will again in the future.


I recently ordered this light to replace one that had been damaged by water intrusion on my boat trailer. The original light that came with the trailer (same as the one I ordered from etrailer) lasted about about three years. The trailer is used primarily in a salt water environment and water got inside the light through the clear lens for the license plate light on the bottom. Once water got inside it damaged the LED's as well. The light without the license plate light worked fine until I switched it out. Overall, I think these lights are good in a fresh water environment and will last much longer than they will with salt water use. These light are bright and should look good on any trailer.


Before purchasing these lights for my boat trailer, I had gone through two sets of lights with incandescent bulbs trying to find lights that wouldn't fill with water and cause damage to the bulbs and sockets. After a year of use, these lights still never leak when the trailer is put in the water. And the brightness of the LEDs is a huge improvement over the incandescents they replaced.


This was a perfect match for my trailer. I carefully hooked it up and it is working fine.



For some reason these were hard to find but they match the trailer so I was glad I didnt have to replace both. Taillight has been working fine.Thanks for checking in.


I recently purchased this item to replace the incandescent version of this light that no longer worked. Installation was quick and easy. The lights are extremely bright and I can easily tell from the driver seat of my truck that they are working. In addition to this light, I also purchased the STL36RB for the passenger side so that I'd have LEDs on both sides of my trailer. I recommend making the jump to LED if you need to replace your old lights.


Bought a brand new trailer and from the get go some of the regular lights were intermittent. Finally had enough and ordered LED's to replace them all; have not had a single light issue over a year later. All were direct drop in replacements, fit and look great. Thanks!


I upgraded to this light set 5 years ago and have been very satisfied with their appearance and performance. They are very bright and distinguished just as many vehicles LED brake lamps are. They are a solid red and do not project the pinkish appearance that some LEDs I examined appeared. The LED's are well sealed into the lenses which prevent water from intruding even if the primary black housing gets cracked from an external force such as a car jack in my case. I purchased this LED lamp because I bumped the fixture with my car jack and broke the side lens, however, the main LED housings remained sealed, intact, and fully operable. I am rather finicky, thus purchased the replacement. If you are looking to upgrade to an LED trailer light, I highly recommend this product and series as they are easy to install (it took me about 5 to 10 minutes), do not fade or weather over time, and are very resilient. I looked at many sites to buy them from, but had the best price, shipping was very fast, and the product was well packaged in the box for its journey to my home. Buy them, you will not be disappointed! Thank you for providing a great product at a great price! They are already installed, look great and as if it was never replaced as compared to the other LED tail lamp, and are ready to go.


Order these boat lights for a friend of ours boat trailer, they arrived sooner than we expected was so easy to install and works great, looks awesome, very pleased.

I called first to see if they carried these taillight and the employee was so nice and helpful, she offered to send a e-mail with the link to order the tail lights, very polite and concerned about our purchase.

We would definitely recommend this company and very impressive with the employees that helped make sure we got the right items we needed.

If I could give them l0 stars I would. Thank You.....


Prompt delivery and it fit my trailer exactly. Had to use my original mounting bolts because I didn't discover the new ones hidden in the bubble wrap until I was discarding the shipping box. (not a big problem)
May I suggest including wire connectors with the light. A trip to the hardware store would be avoided.


Thought I had a problem after the trailer was idle for a few months, but it turned out to be a loose grounding wire. Satisfied.



The trailer has been outside.all year and the.lights still work great.


Awesome company to do business with will by again


Product was exactly as described in all the detail - a brand new genuine Optronics taillight. Ordering was easy and delivery was prompt. I would use again.


The LED light housing and components are well made a easy to wire up. So much brighter than the standard bulbs I currently have now and LED lasts much longer. I like it enough; I'm replacing and converting all my lights to LED.
Nice product.


These lights are fantastic, they are brighter than the standard boat trailer lights, able see license light reflection in sun light, and finally they have supplied S.S. nuts and bolts. No rust!!

I would have rated these 5 star if the nuts and bolts would have been standard size instead of metric. Just took extra time to find mm socket to fit!!


Bought the entire waterproof LED kit from Etrailer previously and was pleased with it. Accidentally busted the drivers side on the last use. Thankfully Etrailer made it easy to find the exact replacement light (without having to buy the whole kit again) and it shipped quick. Already got it replaced and you cant tell the difference.

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • Will Optronics LED Trailer Taillights STL37RB and STL36RB Fit Shorelandr Trailer
    We've seen Shorlandr trailers use the LD tail light part # STL37RB and # STL36RB for the other side so we know it will fit and work great.
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  • LED Trailer Taillight Recommendation for a 3110 Feather Lite Car Trailer
    I looked up pictures of the taillights that are on the 3110 Featherlite trailers and for the LED version of them you would want the part # STL36RB and # STL37RB. It looks like the spare tire mounts for your trailer are something you would have to get from Featherlite though as they aren't like anything we carry.
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  • Replacement Rear Trailer Light Assembly Passenger Side
    The replacement light assembly that you will need is # STL36RB. This assembly is for the rear right side of the trailer. For your information, the other side or left side of the trailer is # STL37RB.
    view full answer...
  • Right Hand Taillight Recommendation to Match the part # STL37RB
    The Left Hand Optronics Light part # STL37RB is sold individually. For the matching right hand side light you would want the part # STL36RB.
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  • Matching Left Hand Side Light to Go with Trailer Light # STL36RB
    The matching left hand light to go with the # STL36RB is the part # STL37RB.
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  • Optronics LED Trailer Tail Lights for 1999 Bass Tracker Boat Trailer
    Since you want to use the Aero Pro Submersible LED trailer tail lights on your Bass Tracker trailer you will want to order part # STL36RB for the right-hand or passenger side and part # STL37RB for the left or driver side. The driver side light matches this design but it has additional LEDs for the extra functions it provides, such as license plate illumination.
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  • Replacement Lens or Replacement Tail Lights for 1997 Jayco Eagle 12 UDK
    The correct replacement lens may or may not be available. We don't have any information on the correct lens cover, so I've linked the page to your options. If you take some precise measurements we may have something compatible. Often the lights used get replaced by the manufacturer over a couple of years so you may need to do full replacements. I recommend the LED Tail Light for Trailers Over 80" Wide - 8 Function - Submersible - 23 Diodes - Driver Side # STL37RB and Passenger # STL36RB.
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  • Is there an LED Replacement Available for the Low Profile Submersible Boat Trailer Lights
    There is an LED version to replace the whole light on your trailer, you could use the Over 80 inch, Rectangular Submersible LED Trailer Tail Light, # STL36RB and STL37RB. The part you were looking at is not available in an LED version. I have added a link to all of our LED trailer lights. You can use the icons at the top of the page or the filters on the left hand side to search for LED lights that may suit your need.
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  • Will You Need to Re-Wire a Boat Trailer In Order to Switch to LED Lights
    No, you should not need to rewire your whole trailer just to switch to LED lights. Unless you get into doing the swap and discover your wiring is damaged, it should be as easy as mounting the new lights and wiring them in. The LED Tail Light # STL37RB (driver side) and LED Tail Light # STL36RB (passenger side) are great choices to replace your Wesbar 105826 lights. These lights are submersible and splice into your wiring in place of your old lights.
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  • If Trailer Light # STL36RB is the Right Hand Light, What is the Compatible Left Hand Trailer Light
    The compatible left side trailer light you are looking for is the Over 80 inch, Aero Pro Submersible LED Trailer Tail and License Light, 2 Wire, 8-Function, 23 Diode, # STL37RB. This is the same light just for the left side. It has the same functions and specs as the right side light that you have referenced with the exception that the left side light has 1 additional function and diodes for the license plate light.
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  • Number of Diodes in Optronics Trailer Taillights STL16RB/STL17RB and STL36RB/STL37RB
    The trailer taillights part # STL16RB and # STL17RB have 18 diodes and the tailligths part numbers # STL36RB and # STL37RB have 17 diodes so they are very similar.
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  • Replacement Trailer Lights for Boat Trailer With Optronics ST36/37 Series Lights
    It sounds like you want to use the Miro-Flex LED Combination Trailer Tail Light - 8 Function - Submersible - 18 Diodes - Driver Side # STL27RB and Passenger Side # STL26RB as replacements for your current lights. That is perfectly fine, and the wires should match up. These are, however, a little longer and shorter when compared to your current lights. If you would like a direct replacement that matches the size of your current lights you can use the # ST37RB and # ST36RB. If you're looking...
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  • LED Replacement Lights for a Boat Trailer with Wesbar 105826 Tail Lights
    For an LED replacement that is nearly identical to the Wesbar 105826 light you can use # STL36RB for the right side and # STL37RB for the left side. There are also versions that have a plug instead of just bare wires. For the right side use # STL36RPG and for the left use # STL37RPG. I have linked a couple of review videos for you as well.
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  • What 3-Prong Harness is the Rectangular ONE LED Trailer Tail Light Designed to Work With
    I do have an option for you but the ONE LED Trailer Tail Light part # STL0067RPG is designed to work with a factory installed three-prong connector which we don't offer separately. These are installed at the boat trailer factory to make changing out the taillights easy. Therefore, if you don't already have this you'll need to go with a hardwire version instead for which I recommend the LED Tail Light part # STL37RB for driver or part # STL36RB for passenger.
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  • Replacement LED Trailer Tail Lights for a Sunnybrook 5th Wheel Trailer
    We have many, many LED tail lights that you could potentially use on your trailer. I have included a link to the options for you off to the right. A light like # STL90RB for example will mount to the surface of the trailer using the 4 mounting holes located around the perimeter. We also have light # RVSTL60 that mounts in a similar fashion. You would take the lens off to access the mounting holes but it, too, mounts on the surface. There are so many options available that if you are looking...
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  • Replacement Tail Light Options for 2002 Pro Craft Boat Trailer
    My technical contact at Wesbar informed me that the submersible light that you have was discontinued a while back so replacement lenses are unavailable. Replacing your tail lights is going to be your best option. The Wesbar Submersible Right Hand Tail Light # 403076 that you referenced is the closest they currently have to the one that you have on your 2002 Pro Craft boat trailer. If you need the left hand light as well, it is # 403026. Another option is the Optronics Aero Pro Submersible...
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  • Do You Have a Replacment Lens for Optronics Light part STL37RB
    I spoke with my contact at Optronics and they do not have a replacement lens for the LED STL37RB or part # STL36RB. They do have them for the incandescent version, part # ST37RB or part # ST36RB. If you have the incandescent lights, the replacement lens is part # A39RB.
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  • Replacement Lens Recommendation for LED Trailer Light STL37RB
    We don't have an exact replacement for the # STL37RB but we do have a replacement lens for the incandescent version of this light. For that you would need the part # A39RB.
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  • Replacement Lens for Optronics ST-36-RH Tail Light
    From what I was able to find out with my research is that the ST-36-RH that you've got is the same light as our Optronics LED Tail Light # STL36RB; the replacement lens for the STL36RB can be found using part # A39RB. With that said, Optronics does make changes to their lights from time to time so I've provided a diagram that shows the dimensions of the current STL36RB that you'll want to make sure your current light conforms to. They should be fairly similar, but the important dimensions...
    view full answer...
    Image 1 for
  • Wire Functions of Optronics LED Tail Light STL37RB and STL36RB
    The replacement light I believe you are talking about is the LED Tail Light for Trailers Over 80" Wide - Driver Side # STL37RB. The brown wire for this light is the tail lights, while the yellow wire is for stop and turn lights. It also has a white wire, which is of course for ground. You will need to match those up to the functions of your trailer's red and black wires; the easiest way to do this is plug in the trailer to the vehicle, have someone activate the functions and you can find...
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  • Comparing Optronics Aero Pro and Glolight Trailer Tail Lights
    There would be a noticeable difference if you had both the Aero Pro light # STL37RB and the Glolight, # STL117RB right next to each other. You would notice that the Glolight seams to actually sort of glow rather than just light up. This is due to the top and bottom bars that light up solid. Both lights are going to be plenty bright. Light # STL37RB has 23 diodes which will be very bright as you can see in the picture submitted by reviewer Becky P. She is using tail lights # STL37RB and...
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    Image 1 for
  • How to Waterproof Trailer Light Connectors on a Nitro Boat Trailer
    What you can do is apply something like Liquid Electrical Tape, # SWC50122, which will insulate, seal, and waterproof electrical connections. I would still recommend wrapping any connections with actual electrical tape as well for extra protection. Another option is to use heat shrink tubing which is usually available just about anywhere tools and/or automotive parts are sold. With this you would first place the tubing around one of the wires before making the connection. Then use a butt...
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  • Waterproofing Trailer Taillight Assembly Connections on a Boat Trailer
    What you can do is apply something like Liquid Electrical Tape, # SWC50122, which will insulate, seal, and waterproof electrical connections. I would still recommend wrapping any connections with actual electrical tape as well for extra protection. Another option is to use heat shrink tubing which is usually available just about anywhere tools and/or automotive parts are sold. With this you would first place the tubing around one of the wires before making the connection. Then use a butt...
    view full answer...
  • Replacement Light, Lens, and Mounting Bracket for Optronics ST37 LH Tail Lights
    If you would like an incandescent replacement, the correct lights are the # ST37RB for the driver side and # ST36RB for the passenger side. If you would like to switch to LED you can use the # STL37RB and # STL36RB. For the replacement lens you need the # A39RB. The replacement side marker lens is the # A37RB. The only mounting bracket we carry that could work is the # CE26057G. The mounting holes on this bracket match the lights with a center to center measurement of 2". However, it is...
    view full answer...
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