bing tracking image
  1. Trailer Lights
  2. Optronics
  3. Tail Lights
  4. Rectangle
  5. LED Light
  6. Red
LED Tail Light for Trailers Over 80" Wide - 8 Function - Submersible - 23 Diodes - Driver Side
Optronics

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

Part Number: STL37RB
In Stock
$51.35
Trailer Lights
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.
By submitting this form, you understand and agree to our Terms of Sale, Website Terms of Use and Privacy Policy.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

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 etrailer.com or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (443)
  • Q & A (0)
  • Photos

Optronics Trailer Lights - STL37RB

Highlights

  • One Light, 8 Functions: Acts as stop, turn, tail, side marker, clearance, and license light for full visibility.
  • Reliable In Any Weather: Sealed, waterproof, and submersible construction keeps electronics protected.
  • Bright, Efficient Output: 23 LEDs provide strong light with low 0.181-amp draw at 12.8 volts.
  • Wide-Angle Coverage: PC-rated design delivers a 180° beam for clear side and rear visibility.
  • Fewer Replacements Needed: LEDs last 50× longer than bulbs and never need filament changes.
  • Simple Surface Mount: 3-wire pigtail and included hardware make for an easy hookup.

Features to know about

Brighter, Longer-Lasting Light: 23-Diode LED Power

When you want a tail light that stands out and stays reliable, this LED design gets it done. It uses 23 diodes to produce bright, even illumination for stop, turn, tail, and license light functions. LEDs last up to 50 times longer than incandescent bulbs and draw less power—just 0.181 amps for the stop/turn signal and 0.047 amps for the side marker at 12.8 volts. That means no weak spots, no burned-out bulbs to replace, and a light you can count on trip after trip.

Built for the Water: Fully Sealed and Submersible

Water exposure ruins most lights, but not this one. The sealed housing keeps moisture out completely, making it fully waterproof and submersible. The circuit board is protected inside so it won’t corrode or short out even after repeated dips in water. Whether you’re driving through heavy rain or backing into the ramp, this light stays clear and bright without letting water sneak in.

All-in-One Coverage: Eight Lighting Functions in One Housing

Simplify your setup with a single rectangular light that handles eight different functions—stop, turn, tail, side marker, side reflex reflector, rear clearance, rear reflex reflector, and license plate illumination. It’s DOT compliant and PC rated for a full 180-degree beam pattern so other drivers can see you from behind or either side. At 7-7/8" long x 3-1/4" tall x 2-7/8" deep, it gives complete coverage without taking up extra space.

Simple Mounting and Wiring: Surface-Mount 3-Wire Design

Installation is straightforward thanks to the surface-mount housing and included hardware. The 3-wire pigtail keeps wiring easy—white for ground, brown for tail lights, yellow for stop and turn signals. Once mounted, it’s a clean fit that looks sharp and performs reliably without extra parts or complicated connections.

Specs

Configuration

  • Configuration: driver side
  • Passenger side: STL36RB (sold separately)

Dimensions

  • Length: 7-7/8"
  • Height: 3-1/4"
  • Depth: 2-7/8"

Dimensional diagram of Optronics STL37RB LED submersible trailer tail light showing length, height, and depth measurements for installation reference.

Electrical

  • Diodes: 23
  • Power draw at 12.8 volts (Stop/turn signal light): 0.181 amps
  • Power draw at 12.8 volts (Side marker light): 0.047 amps

Diagram showing 180-degree light spread pattern of a PC-rated LED trailer light, illustrating 90-degree illumination to each side of centerline.

  • PC-rated light coverage: 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.

Warranty

  • Lifetime warranty on LEDs: Lifetime warranty on LEDs

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

Alternate part: STL-37RB





Customer Satisfaction Score:

Ratings & Reviews

4.8

443 reviews
Review sort icon
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.

by:

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.



by:

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.



by:

Lights performed as advertised. Used them on a boat trailer and they did not leak and short out when submersed in water. Found them also to be much brighter than the lights that came with the trailer. After I see how long they last after repeated submersions, I will consider giving them an excellent rating.



by:

Both products greatly increased the brightness of my taillights which is what I wanted. They have worked since then without fail. The postal service originally lost my order and etrailer didn't hesitate to get another one sent out at no charge. Awesome customer service!



by:

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.....



by:

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 etrailer.com 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 etrailer.com 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.



by:

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 etrailer.com!



by:

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.

Dave profile picture

Dave

10/19/2017

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



by:

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.



by:

Awesome company to do business with will by again



by:

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.



by:

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.



by:

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.



by:

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.



by:

Well I was stranded in California on my way to Idaho with two broken lights. Ordered a set of these for delivery. When they arrived they were poorly packaged together, lenses cracked, split and scuffed. They just threw all the lights in a box with paper. I called to complain and they made me pay for expedited shipping of a replacement set. The product is very cheaply made, thin lightweight and nothing like the Wesbar product I was replacing. Needless to say I'm stuck here wasting my vacation waiting for someone who knows how to pack a box. A little disappointed with Etrailer and Optronics quality.



by:

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. profile picture

Larry W.

8/17/2018

Great



by:

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.

Vern profile picture

Vern

10/2/2018

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



by:

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). :-)

Guy profile picture

Guy

1/6/2018

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 etrailer.com. I imagine youll be hearing from him soon.



by:

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. profile picture

Chris S.

8/23/2016

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



by:

The light matched perfectly and has been working great for the past year! Thank you



by:

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



by:

Perfect fit but didn’t come with the stainless steel hardware pack. Thankfully I was able to use the old ones.



by:

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



by:

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!



by:

With several of the MCL31 clearance I had half or all of the LEDs stop working. I did not at the time realize they had a lifetime guarantee so I just threw them away. When A bunch of the LEDs in both BUL52CBs and about half of the turn/stop LEDs in the STL37RB went out, I contacted etrailer and they happily replaced them, but it took a couple of weeks and I had to pay the shipping. When I replaced all of my trailer lighting, I had thought that I would never have to worry about it again. LEDs should last forwver. That turns out to not be the case and it is a lot harder to change out hard wired LEDs than socketed incandescent bulbs. I wish I could find reliable long lasting LED trailer lighting.


25
25

See what our Experts say about this Optronics Trailer Lights

  • Best Replacement for a Wesbar Tail Light 271594
    Hey Rick. Unfortunately that's correct the Wesbar Tail Light 271594 has been discontinued. Our best option for replacing it is the LED Trailer Tail Light item # STL36RB for the passenger side and item # STL37RB for the driver side. The Wesbar light is about 7" long x 3-3/4" tall x 3" deep. These Optronics lights are 7-7/8" long x 3-1/4" tall x 2-7/8" deep, so they are slightly longer than the old lights but they should fit nicely in the same area. These lights have a Sonically sealed,...
    view full answer...
  • Replacement Tail Light for a Optronics ST-37 LH
    The direct replacement for your Optronics ST-37 LH is the Aero Pro Combination Trailer Tail Light Driver's Side item # ST37RB and passenger side item # ST36RB. These do not have a molded triangle shaped plug so yours must have had that adapter added. It would be easy to swap the connector out when you replace your lights. You'll want to use the Deka Heat Shrink Butt Connector item # DW05744-5. If you're interested in upgrading to the LED equivalent then the correct replacements would...
    view full answer...
  • Passenger Side Light That Matches The Driver Side Optronics LED Tail Light STL37RPG
    Hi Robert! Though we have another option that is extremely similar, the passenger side that matches the Optronics LED Tail Light for Trailers Over 80" Wide - 8 Function - Submersible - 23 Diodes - Driver Side # STL37RPG (part # STL36RPG) was discontinued about a year ago, unfortunately. With that said, the following parts are nearly identical: Optronics LED Tail Light for Trailers Over 80" Wide - 8 Function - Submersible - 23 Diodes - Driver Side # STL37RB Optronics LED Tail Light for...
    view full answer...
  • 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.
    view full answer...
  • 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.
    view full answer...
  • 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...
    view full answer...
  • Optronics LED Trailer Tail Lights with 3-Prong Plug
    For an LED-version of the Optronics light # ST66RPG you can use their parts # STL37RB and # STL36RB. These do not include the 3-prong plug but we offer these, right-angle part # A47PB and straight plug part # A45PB.
    view full answer...
  • Is the TecNiq Seven Function Box Style Tail Light TN62XR a Replacement for a Wesbar 271594?
    No, it is not plug and play Paul but it can be. The TecNiq Contoured Seven Function Box Style Tail Light item # TN62XR passenger side and item # TN42XR driver's side use a 3-Prong PL-3 Plug like item # TN47PV. These lights measure 7-1/2" long x 3-1/2" tall x 3" deep and are commonly used to replace the old discontinued Wesbar 271594 and 271595 lights. You could easily splice the item # TN47PV harness into your existing wiring to make this a plug and play connection. The older Wesbar 271594...
    view full answer...
  • 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.
    view full answer...
  • 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
  • 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...
    view full answer...
    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...
    view full answer...
  • What Size Heat Shrink Tubing Should be Used with LED Trailer Tail Light STL37RB
    You would need the heat shrink tubing for 18 to 14 gauge wire # DW05452 for trailer tail light # STL37RB. On a boat trailer I would not use crimp style connectors like butt connectors because the chance that a wire could pull out due to broken strands is enough of a deterrent for me personally. I would make the splices needed, then use some liquid electrical tape, # SWC50122, and follow that up with the heat shrink tubing. That would ensure a tight, waterproof connection.
    view full answer...
  • Submersible Tail Lights and 4-Way Wiring With Full Length Ground Wires For 15' Aluminum Boat Trailer
    You will need the following components as we do not have a kit with a full length ground wire harness. 4-Way Trailer Harness # A25W2GWB Driver Tail Light # STL37RB Passenger Tail Light # STL36RPG License Plate Bracket # LP10SB
    view full answer...
  • 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...
    view full answer...
  • 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...
    view full answer...
    Image 1 for
  • 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.
    view full answer...
  • 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.
    view full answer...
  • 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...
  • 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.
    view full answer...
  • LED Trailer Tail Lights that Come with a License Plate Bracket and are Submersible
    Optronics trailer tail light # STL37RB does not include a license plate bracket. This is a left hand side light and not all trailers have the license plate on the left side (though it is most common on the left) so the addition of a bracket would not work for all applications so it isn't included. Light kit # TLL16RK might work for you. The license plate bracket is included and the lights are submersible.
    view full answer...
  • 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.
    view full answer...
  • 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.
    view full answer...
  • Is the LED Trailer Light Kit Offered With Longer Wiring Harness
    The trailer tail light kits like part # TL16RK all come with a standard 25' long harness so if you need a longer one you'll need to piece together your own kit. LED Tail Light part # STL36RB and part # STL37RB ThinLine Mini LED Side Marker or Clearance Light part # MCL-91AK 35 Ft 4-Way Trailer Wiring Harness part # A35W42B
    view full answer...


< Previous
12



Do you have a question about this Trailer Light?


Info for this part was:

Employee Patrick B
Expert Research:
Patrick B
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Joshua S
Video by:
Joshua S
Employee Kathleen M
Video by:
Kathleen M
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Laura H
Updated by:
Laura H
Employee Brian T
Updated by:
Brian T
Employee Matthew E
Updated by:
Matthew E
Employee Cole B
Installed by:
Cole B
Employee Robert C
Installed by:
Robert C
Employee Ryan G
Installed by:
Ryan G

At etrailer we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.