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LED Trailer Tail Light - 6 Function - Submersible - 18 Diodes - Rectangle - Red Lens - Passenger

LED Trailer Tail Light - 6 Function - Submersible - 18 Diodes - Rectangle - Red Lens - Passenger

Item # STL56RB
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Optronics Trailer Lights - STL56RB
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6-1/16" x 3-5/8" Rectangle. Waterproof trailer light acts as brake, tail, turn, side marker, side reflex reflector, and rear reflex reflector. Mounts on surface of trailer - hardware included. 3-Wire pigtail. 18 LEDs. Lowest Prices for the best trailer lights from Optronics. LED Trailer Tail Light - 6 Function - Submersible - 18 Diodes - Rectangle - Red Lens - Passenger part number STL56RB can be ordered online at or call 1-636-306-4830 for expert service.
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  • Reviews (245)
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Optronics Trailer Lights - STL56RB

  • Tail Lights
  • Rectangle
  • LED Light
  • Red
  • 6L x 3-1/2W Inch
  • Surface Mount
  • Stop/Turn/Tail
  • Side Marker
  • Side Reflector
  • Rear Reflector
  • Submersible Lights
  • Optronics

6-1/16" x 3-5/8" Rectangle. Waterproof trailer light acts as brake, tail, turn, side marker, side reflex reflector, and rear reflex reflector. Mounts on surface of trailer - hardware included. 3-Wire pigtail. 18 LEDs.


  • Rectangular trailer tail light serves 6 functions
    • Stop light
    • Tail light
    • Turn signal light
    • Side marker light
    • Side reflex reflector
    • Rear reflex reflector
  • 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
  • Durable polycarbonate housing
  • Red acrylic lens over white LEDs
  • Mounts on surface of trailer - hardware included
    • Stainless steel hardware slides along rear channels so that you can adjust the position of the light
  • 3-Wire pigtail
  • DOT compliant


  • Configuration: passenger's side (right-hand side)
    • Driver's-side light (STL57RB) sold separately
  • Dimensions: 6-1/16" long x 3-5/8" tall x 2-1/4" deep
  • Distance between mounting slots (center to center): 2"
    • Hardware size: 1/4-20 x 1" long
  • Diodes: 18
  • Power draw at 12.8 volts:
    • Stop/turn signal light: 0.268 amps
    • Side marker light: 0.059 amps
  • Lifetime warranty on LEDs

Optronics STL56 Series LED Combination Tail Light Diagram

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.

STL56RB Optronics Combination LED Boat Trailer Taillight - 18 Diodes - Red Lens - Right Side

Alternate part number: STL-56RB

California residents: click here

Customer Reviews

LED Trailer Tail Light - 6 Function - Submersible - 18 Diodes - Rectangle - Red Lens - Passenger - STL56RB

Average Customer Rating:  4.7 out of 5 stars   (245 Customer Reviews)

6-1/16" x 3-5/8" Rectangle. Waterproof trailer light acts as brake, tail, turn, side marker, side reflex reflector, and rear reflex reflector. Mounts on surface of trailer - hardware included. 3-Wire pigtail. 18 LEDs.


Put this on my boat trailer and so far one year later still going nice and bright, ready for this year. This trailer goes off road to a remote site boat landing so the lights will take a bouncing on dirt road, no issues. I always install for hardest possible use, I soldier and double shrink wrap then secure the cables.

Still working after 1 year, no issues, still bright.
Gary - 04/13/2022


The red outer lens was not affixed to the tail light. It came right off. I’ve had to glue the lens to the tail light to keep it from falling off. The driver’s side tail light was properly affixed.

These are supposed to be sealed because they are submersible. Customer Service will reach out to you.
-- Etrailer Expert Sierra K - 06/08/2022


The trailer lights are exactly as described. Easy to install. Fast service. Thanks


Exact fit, very bright compared to incandescent lights original to the boat trailer.


I have ordered from you many times before without a issue that I remember but this time one of the lights came without the mounting bolts.

The tail light does come with stainless steel hardware. We will get that sent out to you.
-- Etrailer Expert Heather A - 03/04/2022


I want to thank you for all your help with my trailer you were more helpful than you realize. So this is my trailer for a 22' Flats Cat shallow draft Catamaran. I totally dismantled my trailer and buffed by hand with a wire buffer and sand blasted in some spots and applied multiple coats of some very expensive galvanize paint (Z.R.C.). I installed all new C. E. Smith Carpet (about 80'), seven new LED waterproof lights, new springs, new equalizers, new tongue jack, new wench, new safety chain, new chain brackets, all new SS hardware and a 35' long wiring harness.
I was able to send only one review with a picture of the safety chain and brackets. I'm having a little trouble with the rest..oh some of these items were bought locally or from your competitors, until I found ETRAILER. Your prices were cheaper for the exact same things. Your helpful how to videos were helpful. And Rose, your personal helpful knowledge made my buying experience very pleasant, I actually enjoyed talking to you! Thanks to ETRAILER and specifically to Rose G.


etrailer was there to get a rare lens assembly we were looking for. Thank you etrailer!!


Replaced the jet ski trailer light perfectly! Lighting is much brighter than the stock incandescent bulb in all modes and light disbursement is very good, even from the sides.

A year later and these are still going strong and still very, very bright. Soooo worth it!
Toby - 04/29/2015


The product is working well and the only issue I had was it was four days late arriving.


These lights have been working great. They are substantially brighter than the original ones.


These were replacement for some boat trailer fine and the fit was good

still functioning as it is supposed to..good product and holding up after a year
JS - 08/10/2021


Replaced brand new lights on my duel PWC trailer (ComFab) with these LED lights. Perfect bolt up and what a difference much brighter and don't have to worry about one bulb rendering the light useless. I have used ETrailer many times and I expect to continue using them always fast shipping and fair pricing. Probably the beast thing about ETrailer is the web site you can learn and do anything just by watching the informative videos on this site. I can do pretty much anything but it sure is nice to be able to watch a short video if I get stuck or out of my comfort zone.

I have used these in salt water for the last year they look and work perfect. Quality product worth what spent.
Pat D - 05/22/2014


Thank you for the expeditious response and delivery of the replacement product.


Exactly what I order and got to me 3 days earlier than expected. Perfect service!


cracked lens

I will have our Customer Service team reach out to you.
-- Etrailer Expert Jenny N - 05/19/2022


I mounted these lights on my Kayak trailer and are super bright and easy to install!!!!
You will be very satisfied with these lights


I have not submerged them much so I can't really attest to their durability. After the winter one of them was very dim - only a couple of bulbs were lighting up. After driving around a bit the light started working correctly. Might have been a grounding issue.


Product is as presented on website have not installed yet as it is hunting season. Does not appear that installation will be an issue.


Very bright and also easy to connect. No issues with the lights after a year of use. Highly recommend.

Still no issue and the lights are as bright as when first installed. Great product!
Erik - 08/30/2021


good lights, easy to install and wire up. So easy, even I could do it!
Very easy ordering process, good info provide pre-purchase, and great customer care and follow-up even after the sale.

etrailer will be my first stop for these types of purchases!

they still break if you back into things, but thats why I bought more than I needed. Happy to see that even though i cracked/destroyed the lens, the LEDs proper are colored red as well, so they still work great, even after my abuse. Thanks!
Greg - 03/25/2021


Why did I wait so long !! Don’t make the same mistake! Don’t wIt till you almost lose a finger with conventional transom tie downs.
These things are great!!!!


First, the products are great coming as described and install was pretty easy. Videos also helpful. Make sure you have a good ground to the trailer otherwise the light will not work as designed. I'm glad I called them before I ordered because otherwise I would have ordered two right lights. (I did not see the left light) I might suggest that etrailer add a note to each product description referencing the complementary (right or left) tail light to make a set. This would have gotten me to the correct items without a call. That said, Jonathon in customer service was helpful and identified the correct items. Order received in good shape as expected. I would highly recommend these guys. Good products, fair price, good service.

Working perfectly, very satisfied. Easy ordering and install!
Mario - 05/26/2017


Excellent quality with easy installation. Very reliable after one year operation and several trips to the lake to launch boat. Highly recommended!


Great light. It’s much brighter than what I had before and has done well with submersion in the lake!


These lights are just what I wanted. They fit into the original space(of my 31year old Shore Lande'R trailer) and look like the original lights converted to LED. Form, fit, and function are just right. Anyone having an older trailer go for the slim line lighting as they are only 1 1/2 inches thick and fit up under the small lip many older trailers have.

Great not a problem of any kind with these lights.
James - 04/03/2020

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • Troubleshooting Right Turn Signal Not Working on Trailer
    The type of light assembly (left or right side design) you have mounted on the right side of your trailer should not be an issue in terms of function. The light will still power in correspondence to the circuit it is connected to. If just the right side turn signal is not working, I recommend starting with making sure the light assembly is grounded properly. Depending on its style, it might use a dedicated ground wire or it may simply ground through its mounting hardware. In either case...
    view full answer...
  • Vehicle and Trailer Lights Stop Working when Plugging Trailer Into Vehicle
    If you first turn off the vehicle lights and then plug the trailer in does the same thing happen when you turn the vehicle lights back on? If so then it could be a couple of things; weak ground, short, dirty/corroded trailer connectors or wiring. If it doesn't happen when you turn the vehicle lights on as the last step then there is probably a short, something arcing, when you plug in the trailer. That could cause any fuses, breakers, or relays to trip or blow (and in the case of a circuit...
    view full answer...
  • Replacing Tail Light in 2007 Shorelandr Jet Ski Trailer
    If you have the LED Trailer Tail Light - 6 Function - Submersible - 18 Diodes - Rectangle - Red Lens - Passenger # STL56RB you referenced there is not a bulb to replace. Most boat and and Jet Ski trailers will use sealed units because they are submerged so they won't have a bulb replacement option. You'd need to replace the entire unit because it is not designed to be opened up.
    view full answer...
  • How to Install a Trailer Tail Light with 3 Wires When Trailer Only Has 2 Wires
    The brake lights and turn signals on your 2000 Burro trailer are on the same circuit so the two wires you have are the brake and turn signal on one and running lights for the other. The ground is through the mounting hardware of the light. If you're replacing the lights with a 3-wire light, like part # STL56RB, the white wire is for ground and needs to be connected to a bare surface on the trailer's frame instead of grounding the light through its hardware.
    view full answer...
  • Can LED Trailer Tail Light # STL56RB Install on 2 Wire Trailer
    The trailer taillight part # STL56RB does use three wires to wire to the trailer wiring. The white is ground, the green is stoplight/turn, and brown is running lights. So sometimes trailer wiring only has two wires and that's because the assemblies used can ground through the mounting hardware. So if your trailer only has 2 wires you'd need to run the ground wire of this assembly to the mounting hardware and you'd be set.
    view full answer...
  • Dimensions of Submersible LED Trailer Light Kit # STL56RB
    The submersible LED tail lights that come closest to the dimension you mentioned are part # STL57RB and # STL56RB, which measure 6-1/16 by 3-5/8 inches by 2-1/4 inches deep. You can see these lamps by clicking the provided links.
    view full answer...
  • Are there Replacement Lenses Available for the Optronics Waterproof Light # STL56RB
    I spoke with my contact at Optronics and they do not sell replacement lenses for these lights. These lights are submersible so they are sealed from the factory. There is no way to replace the lens and re-seal it. You will need to replace the Optronics Trailer Light # STL56RB, if you need the left hand side you will need a Optronics Trailer Light # STL57RB.
    view full answer...
  • Is There a Right Hand Version of the Rectangle LED Trailer Tail and License Plate Light # STL57RB
    Yes, the right hand version of the Tall Rectangle Submersible LED Trailer Tail and License Plate Light # STL57RB that you referenced is the part # STL56RB.
    view full answer...
  • Replacement 6" wide x 3-1/2" Tall Tail Lights For Boat Trailer
    I'll start out by saying that you don't necessarily have to use the same sized lights, but it's occasionally helpful when it comes to mounting them. However, if you're not replacing like for like, the odds that your new lights will have the exact mounting pattern or method is unlikely. I'll also add that if your other trailer lights are incandescent, this isn't really a recommended setup. The problem is the amount of power required by each type. LEDs require much less power incandescent...
    view full answer...
    Image 1 for
  • Is There a LED Combination Trailer Tail Light Only 6" Long
    The LED Combination Trailer Tail Light part # STL14RB measures 8" long x 2-7/8" tall which is a standard for this type of light. It is not offered in a version that is 6" long but we do have other similar options which are, the LED Trailer Tail Light part # STL56RB which measures 6-1/16" long x 3-5/8" tall.
    view full answer...
  • Replacement Stop/Turn/Tail Light Option for a Karavan Boat Trailer
    I do have a recommendation for you but at this time we don't have the exact replacement lights for your Karavan trailer. We do have the submersible driver side # STL57RB and passenger side # STL56RB lights from Optronics though that measure 6-1/16" long x 3-5/8" tall x 2-1/4" deep. These feature LED lights, a light for your license plate, and carry the stop/turn/tail light functions. I have attached some photos with dimensions as well as review videos for you to check out.
    view full answer...
    Image 1 for
  • Can Passenger Side Optronics Light Be Used on Both Sides of Trailer
    If you don't have a need for a license plate on your boat trailer then there's no reason you can't use the Optronics LED Trailer Light - Passenger Side # STL56RB (which doesn't include the license plate light) on both sides of the trailer. The license plate light is the only difference between the two assemblies. The "Over 80/Under 80" designations you see on some lights have to do with the trailer's width. A trailer that is wider than 80 inches requires additional side markers and clearance...
    view full answer...
  • Matching Passenger Side for Optronics LED Trailer Light # STL56RB
    Sounds like you are looking for the matching passenger side to match the # STL57RB that you referenced. For that you'd need the part # STL56RB and you'd be set. I attached an install video for these for you to check out as well.
    view full answer...
  • Replacement LED Tail Light For Trailer With 2-Inch Center-To-Center Mounting Holes
    The tail light we offer that comes the closest to the dimensions you referenced is the Optronics part # STL56RB. This is a submersible, 18-diode tail light. The measurements for this light are 6-1/16 inches long x 3-5/8 inches wide x 2-1/4 inches deep. This light offers 6 functions, Stop, Turn, Tail, Rear Reflex, Side Marker, and Side Reflex. The # STL56RB is designed for the passenger side of the trailer. For the driver side you need part # STL57RB. This light has 23 LED diodes and...
    view full answer...
  • Why Isnt There a Replacement Lens for the Optronics Taillight STL57RB
    I spoke with my contact at Optronics and they do not sell replacement lenses for these lights. These lights are submersible so they are sealed from the factory. There is no way to replace the lens and re-seal it. You will need to replace the Optronics Trailer Light # STL56RB, if you also need the left hand side you will need a Optronics Trailer Light # STL57RB.
    view full answer...
  • How Many Lights Are Included In Rectanglular Submersible LED Trailer Tail Light # STL56RB Package
    The # STL56RB is sold individually and is designed for the right side(passenger side) of the trailer. For the left side(driver side) you would want part # STL57RB. This has the same 6 functions as the right hand but also has the license plate light included. It is also sold with one in the package.
    view full answer...
  • Are The Lenses of the Optronics Light # STL56RB Replaceable
    I spoke with my contact at Optronics and they do not sell replacement lenses for these lights. These lights are submersible so they are sealed from the factory. There is no way to replace the lens and re-seal it. You will need to replace the Optronics Trailer Light # STL56RB, if you need the left hand side you will need a Optronics Trailer Light # STL57RB.
    view full answer...
  • Matching Left Side Trailer Tail Light to Go with LED Light # STL56RB
    LED Trailer Tail Light # STL56RB is for the right hand side of the trailer. The left side is # STL57RB. You couldn't mount these lights upside down because they hang from bolt heads and could fall off.
    view full answer...
  • Upgrading Small Utility Trailer Incandescent Lights To LED Trailer Lights
    I think you will be very happy with an upgrade in your lights to the LED Trailer Tail Light - 6 Function - Submersible - 18 Diodes - Rectangle - Red Lens - Passenger, # STL56RB and the # STL57RB for the driver side. You can ground the lights independently to your trailer. Many wiring harnesses have the brown and yellow combination like you mentioned and it is most likely the case that you can connect the brown to brown and yellow to green as you mentioned, however I can't say that it...
    view full answer...
  • Recommended Submersible Trailer Light For Karavan Boat Trailer
    We don't have a light that is 6 x 2-1/4 x 3-1/2 inches, but we do have lights that are 6 1/16 wide x 3-5/8 tall x 2-1/4 deep if the measurements were just given in a different order. Unfortunately trailer lighting companies change their lights from time to time and the dimensions often change with a newer design. I recommend you take this opportunity to upgrade your lights on your karavan boat trailer. I recommend you use the LED Trailer Tail Light - 7 Function - Submersible - 23 Diodes...
    view full answer...
  • Driver Side Trailer Taillight to Match STL56RB
    Along with the passenger-side LED trailer light # STL56RB you can use the mating driver-side light # STL57RB. This is identical except that it also includes the license plate light function. Both of these submersible lights share the higher-efficiency and brighter output of LEDs as opposed to standard incandescent bulb lights that waste power, generate more heat and require replacement.
    view full answer...
  • Will Optronics Submersible LED Trailer Tail Light # STL56RB Fit a 1987 Shorelander Trailer
    Yes, the Optronics Tall Rectangle Submersible LED Trailer Tail Light, part # STL56RB, will work on your 1987 Shorelander trailer. We have gotten back many reviews of these lights working just fine on Shorelander trailers. I will give you the dimensions of the lights so you can make sure they will fit your trailer. The light is 6-1/16 inches long x 3-5/8 inches wide x 2-1/4 inches deep. They have two slots on the back of the light, 2 inches apart, for mounting on the trailer. The light...
    view full answer...
  • Availability Of Replacement Light To Replace LED Tail Light STL57RB With Missing Lens
    I have a complete replacement light for you, but the red cover on the LED Combination Trailer Tail Light # STL57RB you have is not available by itself. Instead you will need to replace the entire light with the # STL57RB for the driver side, and the # STL56RB if you need the passenger side as well. I included videos of the products mentioned for you to take a look at.
    view full answer...
  • Correct Replacement 6 Long x 3-1/2 Tall LED Tail Light Upgrade for Trailer
    The LED Combination Trailer Tail Lights part # STL57RB for driver or part # STL56RB for passenger seem to be a match for what you need as they are 6-1/16" long x 3-5/8" tall and have LEDs. They feature a simple two bolt standard design.
    view full answer...

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