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Combination LED Trailer Tail Light - Submersible - 6 Function - 18 Diodes - Passenger Side

Combination LED Trailer Tail Light - Submersible - 6 Function - 18 Diodes - Passenger Side

Item # OPT39FR
Our Price: $25.35
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Shipping Weight: 0.77 lbs
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6-1/4" x 4-5/8" Square. Waterproof trailer light serves 6 functions: stop, turn, tail, rear reflex, side marker, and side reflex. Stud mount on 2" centers. 2-Wire self-grounding design with 15" leads. Great Prices for the best trailer lights from Optronics. Combination LED Trailer Tail Light - Submersible - 6 Function - 18 Diodes - Passenger Side part number OPT39FR can be ordered online at or call 1-800-496-5010 for expert service.
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Optronics Trailer Lights - OPT39FR

  • Tail Lights
  • Rectangle
  • LED Light
  • Red
  • 6-1/4L x 4-3/4W Inch
  • Stud Mount
  • Stop/Turn/Tail
  • Rear Clearance
  • Side Reflector
  • Rear Reflector
  • Submersible Lights
  • Optronics

6-1/4" x 4-5/8" Square. Waterproof trailer light serves 6 functions: stop, turn, tail, rear reflex, side marker, and side reflex. Stud mount on 2" centers. 2-Wire self-grounding design with 15" leads.


  • Square combination trailer tail light serves 6 functions
    • Stop light, turn signal light, tail light, rear reflex marker, side marker light, and side reflex reflector
  • Built-in reflex reflector removes the need for a separate reflector
  • Sealed, waterproof construction is submersible
  • Durable surface-mount technology (SMT) construction of LED circuit board
    • Better withstands shock and vibration
    • Allows for improved heat distribution
  • LEDs make great replacements for incandescent lights
    • Last 50 times longer
    • More efficient - provide better light with less power output
    • No bulbs to replace - no brittle filaments
  • Molded plastic housing and durable acrylic lens
  • Red lens over white LEDs
  • Stud mount with included hardware
  • 2-Wire pigtail hardwires with 15" leads
    • Self-grounding design grounds through hardware


  • Configuration: passenger's side
    • Driver's side: OPT59FR (sold separately)
  • Dimensions: 6-1/4" wide x 4-5/8" tall x 2-11/16" deep
    • Light face: 4-5/8" wide x 4-5/8" tall
  • Distance between mounting studs (center on center): 2"
  • Diodes: 18
  • Power draw at 12.8V:
    • Stop light: 0.268 amps
    • Side marker light: 0.059 amps
  • Wire length: 15"
  • Lifetime warranty on LEDs

Optronics STL Series Waterproof LED Combination Tail Light Diagram

STL2RGB Optronics Combination LED Trailer Tail Light - Submersible - 6 Function - 18 Diodes - Passenger Side - 15" Lead - Self Grounding

Video of Combination LED Trailer Tail Light - Submersible - 6 Function - 18 Diodes - Passenger Side

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Review of Optronics Trailer Lights - 6 Function LED Submersible Tail Light - OPT39FR

Ellen: Hey everyone. I'm Ellen here at and we're going to be taking a look at the submersible trailer light for your passenger side of your trailer. This gives you six functions in one unit. It gives you your stop, turn, and taillight functions, as well as a rear deflector and side deflector, and then also your ground function, so gives you all those things right in one unit. It is an LED light so it's going to last a lot longer than your typical incandescent lights, and since it's submersible you can use this on a marine trailer or really any trailer that you want to make sure that this isn't going to get any kind of water, dirt, dust, or debris getting in there and causing any issues, so it should be a pretty long lasting, sturdy light that again, gives you all those functions in one unit, and should be pretty easy to mount up, so let's take a closer look.I have this illuminated now, or this would be the taillight function that it has going so whenever you turn on your lights or your running lights, this is what you can expect. Normally it looks like that.

Turn our lights on, and that's the difference. Turn the lights out in the studio. You can see how bright that light is, and we do have that side marker light as well. Then if you hit the brake or you use your turn signal, it gets brighter. Turn the lights back on, turn my light out, and it's kind of hard to see but this is also a reflective surface here going all the way around the light and also has reflectors there on the side so again, gives you all those functions that you need.As far as the wiring goes, it's pretty easy.

We'll just have two wires to connect, so the brown wire will go to your running lights. The green wire will go to your stop and turn signal, and then it will be grounded to the studs that are pre mounted on the back. So that's one thing I really like about this light is that it's pretty easy to mount in place, has these preexisting studs, and it does come with the hardware. You get a flange nut and flat washer to attach it, so you just find a good spot for this. Maybe drill out a couple holes if you don't already have some in your trailer, pop this guy on there, tighten that hardware down, and that's pretty much all you got to do, and then just attach the wiring.There's also a couple slots here to allow that wiring to fit up in that little groove if you want it to be more of a flat or flush mount.

It looks like maybe you could slide something in here, but I'm not really sure what that's intended for, but this would be again the top of the light and it does give you that indicator so you can keep the passenger and driver side separate.They are available. You can find the driver side available here at as well, which is a good idea to get while you're here so that you have those matching lights. They look pretty similar, but again, it does have that indicator to let you know which side is up, and also the difference is that this one does not have the license plate light, so it just gives you those six functions instead of seven.As far as the measurements, give you some numbers to think about here. The total length of the light is right about 6 inches, maybe 6 1/4 with the hardware that's at the end. Top to bottom it's just over 4 1/2, so about 4 and 5/8 of an inch.

Then front to back without the hardware, it's about 2 5/8. With that mounting hardware or the studs on the back, it's about 3 1/2 inches deep. The leads coming off of the light are about 15 inches long, and then between our studs center to center, the distance between those is 2 inches. As far as the diodes here, we do have 18 total diodes. The power draw at 12.8 volts for the stoplight signal is 0.26 amps, for the side marker light is 0.059 amps, so pretty low draw. There is a lifetime warranty on those LEDs and should be a nice light unit for your trailer.Again, if you want to find the driver side light, you can also find that here at That part number is listed on the product page, but it's going to be OPT59FR, so you can find that right here at to match with this one. I hope this has been helpful in deciding if this is going to be the right light for you. Again, I'm Ellen here at Thanks for watching.

Customer Satisfaction Score:

Customer Reviews

Combination LED Trailer Tail Light - Submersible - 6 Function - 18 Diodes - Passenger Side - OPT39FR

Average Customer Rating:  4.9 out of 5 stars   (14 Customer Reviews)

6-1/4" x 4-5/8" Square. Waterproof trailer light serves 6 functions: stop, turn, tail, rear reflex, side marker, and side reflex. Stud mount on 2" centers. 2-Wire self-grounding design with 15" leads.


These lights are hard to kill. I just replaced the 9 year old ones on my 18', 9,990 GVWR flatbed trailer. This is running in MA through road salt, being parked over dirt, constantly wet, and buried under feet of snow for sometimes several weeks at a time. They never completely fail - it's usually just the bottom few LEDs that stop lighting. The only reason I replace these is because they get beat from backing into things in the dark, since they're so low to the ground. Usually the side marker busts off. I had repaired them several times, but now the side marker LED has failed, along with both lenses being in several pieces. Time for a new one I guess. 9 years in harsh conditions isn't a bad run in the 21st Century! They STILL work! Usually stuff is garbage these days, but this is a quality light right here. Very happy with them.

Replacements are doing well! Made an effort to slow down at night time while backing to avoid further damage.
Smithsonite - 10/02/2022


When I was told these were much better then the previous model that was being phased out I was a little bit skeptical to say the least. When I received this today I immediately took the busted one off and put these on as a direct replacement. The quality of the entire light is great, I can't wait to see them at light because they should be easily seen.


Great Quality!


Already installed on boat trailer...nothing but led's for me !


Perfect match to one I already had.


Ijust put them on and plug them in. they are bright and easy to see.



Better than great.








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Info for this part was:

Employee Kathleen M
Installed by:
Kathleen M
Employee Wilson B
Updated by:
Wilson B
Employee Daron K
Edited by:
Daron K
Employee Brian T
Written by:
Brian T

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