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Optronics LED Transit Tail Light - Stop, Tail, Turn - Submersible - 31 Diodes - Red Lens

Optronics LED Transit Tail Light - Stop, Tail, Turn - Submersible - 31 Diodes - Red Lens

Item # STL90RB
Our Price: $35.47
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Shipping Weight: 0.88 lbs
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Optronics Round Trailer Lights - STL90RB
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7" Diameter round. 3-Function, waterproof transit light acts as brake, tail, and turn signal light. Durable polycarbonate housing and lens. Surface mount with mounting gasket (sold separately). 3-Wire design. Great Prices for the best trailer lights from Optronics. Optronics LED Transit Tail Light - Stop, Tail, Turn - Submersible - 31 Diodes - Red Lens part number STL90RB can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (228)
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Optronics Trailer Lights - STL90RB

  • Tail Lights
  • Round
  • LED Light
  • Red
  • 7 Inch Diameter
  • Surface Mount
  • Stop/Turn/Tail
  • Submersible Lights
  • Optronics

7" Diameter round. 3-Function, waterproof transit light acts as brake, tail, and turn signal light. Durable polycarbonate housing and lens. Surface mount with mounting gasket (sold separately). 3-Wire design.


  • Round LED trailer transit light serves 3 functions
    • Stop light
    • Tail light
    • Turn signal light
  • Sonically sealed, waterproof housing and lens unit is submersible
  • 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 lens and housing
  • Red lens over clear LEDs
  • Compatible with 12V DC systems
  • Surface mount to trailer with included mounting gasket
  • 3-Wire design hardwires to trailer


  • Dimensions: 7" diameter x 1-7/16" thick
  • Distance between mounting holes (center on center): 6-1/4"
  • Power draw at 12.8V:
    • Stop/Turn Signal: 0.243 amps
    • Tail light: 0.046 amps
  • Lifetime warranty on LEDs

Manufacturer Cross Reference
Light will work as an exact replacement for:
Uni Bond # LED7007R

Optronics STL90 Series LED Transit 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.

STL90RB Optronics LED 12V Transit Tail Light - Stop, Tail, Turn - Submersible - 31 Diodes - Red Lens

Alternate part number: STL-90RB

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Optronics LED Transit Tail Light - Stop, Tail, Turn - Submersible - 31 Diodes - Red Lens - STL90RB

Average Customer Rating:  4.9 out of 5 stars   (228 Customer Reviews)

7" Diameter round. 3-Function, waterproof transit light acts as brake, tail, and turn signal light. Durable polycarbonate housing and lens. Surface mount with mounting gasket (sold separately). 3-Wire design.


Great replacement for a set of older incandescent style lights. Far far brighter, super easy install, larger size let me pretty well cover the existing holes from the old rectangular lights. Does have a license plate holder but those are usually pretty brittle anyhow. I just got a flush mount plate bracket which looks better.


Etrailer has been a huge help for our lighting needs.


Wow very nice quality. Very bright and looks great on my vintage Shasta. Also Etrailer customer service is wonderful!


These lights have been an outstanding upgrade from the original incandescent brake/turn/tail/reverse lights on my department's 1992 water tanker. The diodes in the lights are really bright and can be seen clearly at nighttime or during the day. 10 out of 10, would recommend!


Perfect replacement and nice and bright


Original 'top hat' tail/brake/signal lights for my little Scamp camp trailer are not available so I searched for a comparable light in LED & found these. They're the same diameter & the mounting pad & simple wiring made it easy to replace the 'long gone' originals with bright, easily seen lights that many folks think are factory.

Ted B.


Harvey, You did exactly what Im trying to do, replace the tail lights on my 13, scamp.But the lights above dont say anything about signal lights in the product description, even called.No was what I was told. Did you wire these so you can have signal lights ? TED

Patrick B.


These will in fact work with turn signals, we are in the process of updating the page. There are 3 wires on the back of the light. White = Ground Black = running/tail lights Red = brake and turn signals Check out the link to the Expert Answer page for more information.


very happy with the product and how quick it arrived


I looked all over the web for this type of light.
The 7" round LED makes it very noticeable.
As far as safety the light is great.
Ordering and shipping was very easy.
I will be recommending this site to anyone who is needing parts.

Lonnie L.


They are great. Very visible.


Just what I needed for an old 30ft New Flyer. Also works on Opus Optimas (if anybody has any of those horrible things still around) Good light from a good company. I chose fast shipping and they actually packaged it and shipped it out right away. Thanks George!



They are still going strong! Im very happy with them and that you guys stock them in 24 volt. I wish you also had the flanged four inch amber ones in 24 volt too. The manufacturer of our vehicles marks things up so much its ridiculous. Anyway, thanks for the good products, prices, simple website.


Fit the size and mounting holes on my 1969 Airstream Caravel perfectly. A great replacement for the old beat-up and corroded lights. All four functions (turn, stop, run, brake) work great with my completely new trailer wiring job. I hooked them up temporarily to validate all my wiring and then took them off until the restoration and polishing is complete so that they don't get ruined.


I bought two of the lights to use on my 2005 Forest River Cardinal 5th wheel. Trailer had the original equipment 7 inch lights. This light fit perfect in the same holes. I did have to rewire the light but that was easy since these lights have instructions on the back to tell which wire is brake, ground, or tail. It comes with a water proof dense foam gasket. This is a nice bright light.

I still have two of the old lights as my trailer has 4 in the back. I am a cheap fellow and will use these lights whenever another old one bites the dust.

Be advised the factory used caulk and screws to install the light. They did not want to come off after 15 years. TIP: I used a heat gun moving it all the way around the circumference of the light for about 2 minutes. I waited about 5 minutes and then made a steel widget to pry off the lights. They came off much easier with the heat.


These work great. These replaced the original round tail lights on an 80's Scamp camping trailer. Other cars can now see my lights!


Great quality.
Great price.


Good product


The lights are great easy to install and looks GREAT too, Super Bright!


A large bright combined stop/turn/tail light designed to be mounted on flat surface. Looks to be good quality. We mounted it on a bracket and using it as a removable tow light for our Jeep.


These LED lights look well made and I'm sure they will be very bright and durable.
I'll provide more feedback and pictures when they are installed on my 1970 Boler trailer.
The only reason I didn't give them 5 stars is because I haven't installed them yet.


The lights look great and they perform as described. This was quite a relief since I had ordered my first set of lights from an Amazon Supplier that were defective (all four of four were defective). I had spent several hours trying to troubleshoot what I was doing wrong finally to realize that the brand new lights I had purchased from the other supplier were all bad.
I appreciate the quality of your product. They look great on my motorhome.


They work for me. They really brighten my stop and taillights. Installation was easy and they fit.


After a year owning an LED 3rd brake light, it still works fine. No water seepage, all is well??????


These work great. Received my order in a timely matter. Great company to work with.


Exactly what I wanted! I'm using them to replace the rear tail lights on my 1966 Nomad- I wanted a super bright large round tail and etrailer delivered!!! I didn't want to put in months of work and $1000's of dollars to hav someone rear wnd me.
Awesome product!


Installed the LED taillights on my fifth wheel camper, what a difference they made. They are real bright and very good looking on my camper. Thanks for a great product, fast delivery also.


We wanted to update the look of our old school buses with new LED bulbs. It was easy to change out the fixtures. Great improvements versus the incandescent bulbs. We had the new LEDs running within 30 minutes.


We have been working on our travel trailer to sell and the one thing everyone wants is the bright optics tail light. I found this one that fits our old trailer and it was shipped immediately!

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • No Trailer Turn Signals After Installing New Tail Lights
    The first step for troubleshooting the trailer turn signal lights is to test the vehicle side connector. If you are not getting any power on this circuit then you will need to check the fuse box for any blown fuses. If you have an aftermarket trailer wiring harness then test the turn signal wires before and after the converter box to ensure the signal is both entering and leaving. Finally, check the ground for the vehicle side trailer connector. If you do get power to the vehicle side...
    view full answer...
  • What Color Wires Circuits are On Optronics LED Light # STL90RB
    On the Optronics light # STL90RB the black wire is for the stop/turn circuit so that is where you'd run your blinker circuit to. The black wire gets the running light circuit and white is ground. You would need to identify all 4 of your wires to determine how to run them to the light. It's very possible that two of the wires are grounds.
    view full answer...
  • Can the Optronics Trailer Light # STL90RB be Used as a Taillight/Stop Light/Turn Signal
    Yes, this Optronics Trailer Lights # STL90RB can be used as a combined trailer tail light that can function as a taillight, a turn signal and a brake light. It has dual intensities so that it could be used as a tail light and then when the blinkers or brakes are applied the brighter filament will illuminate. When you wire this into the wire of your trailer the white wire will need to be attached to a good clean metal surface. The black wire will be run to the tail light circuit of your...
    view full answer...
  • What Wire Gauge is Optronics Transit Tail Light STL90RB?
    I spoke with a representative of Optronics who did not have that information for the wire gauge on Transit Tail Light # STL90RB, though based on similar lights I can tell you that it is very likely to be 18 or 20 gauge wire. This is a surface mount LED light that measures 7" diameter x 1-7/16" deep and can be used as a stop, turn, or tail light. I've added a link to a video review of this light for you to check out as well.
    view full answer...
  • Will Optronics LED Transit Tail Light Fit Reflect-O-Lite 110 Mounting Holes on 1963 Airstream Bambi
    The only way to confirm if the Optronics LED Transit Tail Light # STL90RB mounting holes will line up with the Reflect-O-Lite 110 holes is to measure what you currently have. The mounting holes on the Optronics light are 6-1/4" apart center to center. If this is the same as your measurement then the light will work well as a replacement.
    view full answer...
  • LED Trailer Tail Light Lights up Wrong LEDs on One Side when Brakes are Applied
    Take a look at the video I have linked to the right that shows how the LED trailer tail light # STL90RB is supposed to light up. The outer LEDs light up bright when the brakes are applied. If this is how your lights are lighting up then they are functioning normally. But it sounds like you have one that is functioning normal and one that is functioning opposite of how it should be. The center of the light is the running light and the outer LEDs are the brake and turn signal. On the...
    view full answer...
  • What are the Wire Functions for Optronics Transit LED Stop/Turn/Side Marker/Tail Light # STL90RB
    On Optronics tail light # STL90RB, the red wire is for brake and turn signals and the black wire is for running lights. And like you said the white wire is the ground wire. Trailers have what is called a combined or 2-wire system. This means the brake lights and turn signals are on the same circuit on each side. I have linked a video review of this light for you.
    view full answer...
  • Possible LED Replacement for Glo Brite Trailer Clearance Light
    I looked up the Glo-Brite light you mentioned. Light # STL90RB is almost exactly the same. It has the same 7 inch diameter and the same 6-1/4 inch hole spacing. It is a little deeper by about 7/16 inches. It also has more diodes, 31, compared to the Glo-Brite with 17. As far as fitting in its place though # STL90RB is the way to go.
    view full answer...
  • Optronics Transit Tail Light # STL90RB Works When Truck is Off, But Turns Off When Truck is On
    The White, Black, and Red wires on the Optronics Transit Tail Light # STL90RB will connect to the following functions: White - Ground Black - Tail Red - Stop/Turn You can test the wiring functions on your trailer by just touching the ends of the Black or Red wire with the wires that were hooked up to your previous light. If you do not have the White wire properly grounded then that is most likely your problem. If one of your wires doesn't connect to a ground then you will want to make...
    view full answer...
  • Distance Between Mounting Holes of Optronics Trailer Light # STL90RB
    The distance between the mounting holes of the Optronics trailer light # STL90RB is 6-1/4 inches so you could easily compare that to what you have now and know if this will fit and work. I also attached a link to our return policy page as well.
    view full answer...
  • Is Optronics LED Transit Tail Light a Single Light or a Pair of Lights
    The Optronics LED Transit Tail Light # STL90RB is a single light; for a pair of them you would need to insert "2" in the "Quantity" box on the product page. I have added a link to a video review for you to check out as well of the Optronics LED Transit Tail Light # STL90RB.
    view full answer...
  • Replacement Multi-Function LED Trailer Light for Glo-Brite 9852-88
    I have a solution for you, but we do not carry Glo-Brite lights, so replacing it with the same brand will not be something I can offer you. Instead, to replace your Glo-Brite 9852-88, I recommend using the Optronics LED Trailer Tail Light # STL72RB. This is also a 10 diode LED light with stop, turn and tail light functions like the light you're replacing and also measures 6-7/16" long and 2-1/8" wide like your Glo-Brite light. The Optronics brand is synonymous with high quality craftsmanship...
    view full answer...
  • How to Wire 3-Function Reverse/Turn/Stop Light in Vehicle with Combined Stop/Turn Wiring
    In order to install your 3-function lights on your 1997 Dodge Ram 3500 that has combined stop/turn wiring you will need a vehicle-to-vehicle taillight converter, part # 118158 from Tow Ready. This converter separates the combined stop/turn functions into separate signals that run on separate wires. This converter will work only on incandescent lights, but not with LEDs. Your vehicle running/tail light wire will bypass the converter and go directly to the wire on your lights that operates...
    view full answer...
  • LED Lighting Options for a Honda Trailer With Incandescent Surface Mount Lights
    I checked all of the lights that we have available at this time and there are two lights that may work for you. The Tall Rectangle Submersible LED Trailer Tail Light, 6-Function, 3 Wire, 18 Diode, Right Hand, item # STL56RB, or the 7 inch Round Transit LED Stop and Tail Light, 31 Diode - Red, item # STL90RB, are the only surface mount LED lights that we carry that might work for your application. They are quite a bit larger than the existing lights you have on the trailer now. If the...
    view full answer...
  • Replacement Taillight Options for 1967 Airstream Caravel Trailer
    I have a solution for you, but we do not offer any vintage 575 lights. I was able to find that the 575 lights were round taillights that measured 7 inches in diameter. To replace your exisiting lights with those of the same diameter, we offer both incandescent and LED lights. Our most popular 7 inch diameter, round, red trailer taillight is the Optronics # ST90RB. This is an incandescent, sealed taillight. The three taillight options that come with LED lights are the Optronics # STL90RB,...
    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...
  • Comparing the Transit # STL90R24B and # STL90RB Tail Lights
    The difference between the Transit Tail Lights # STL90R24B and # STL90RB is that the former is compatible with 12V or 24V systems while the latter is only compatible with 12V systems. Aside from that they both use the stop/turn/tail functions, are LED, have 31 diodes, are submersible, and have the same dimensions.
    view full answer...
    Image 1 for
  • Replacement Trailer Tail Light for a Glo-Brite 9877-88 LED Tail Light
    I looked up the Glo-Brite light you mentioned. Light # STL90RB is almost exactly the same. It has the same 7 inch diameter and the same 6-1/4 inch hole spacing. It is a little deeper by about 7/16 inches. It also has more diodes, 31, compared to the Glo-Brite with 17. As far as fitting in its place though # STL90RB is the way to go.
    view full answer...
  • Replacement Glo-Brite 118R Lens Recommendation
    Based on my research, the Glo-Brite 118R red light is approximately 4 inches long by 1-1/2 inches wide. I spoke with my contact at Optronicc who confirmed that their Replacement red Lens # A44RB will fit the Glo-Brite 118R trailer light.
    view full answer...
  • All Lights on Truck and Trailer Blink After Installing New Trailer Lights on 1988 Scamp Trailer
    On the Transit LED Stop/Side Marker/Tail Light, # STL90RB, only the outer ring of LEDs and the center circle illuminate with the tail light function. The middle ring is a reflector, not a light (see photo). When the stop or turn signal is activated, only the outer ring should illuminate with a higher intensity, not the center circle, I made a short video for you showing how this light should function. Based on your description, it sounds like your trailer has a 3-wire setup rather than...
    view full answer...
    Image 1 for
  • What are the Wire Functions for Transit LED Stop/Turn/Side Marker/Tail Light
    On Transit LED Stop/Turn/Side Marker/Tail Light, # STL90RB, the white wire is ground, the red wire is for brake lights and turn signals, and the black wire is for running lights. It sounds like your trailer may have had separate turn signals from the brake lights. This would explain the 4 wires instead of 3. You will need to verify the functions of the trailer wiring using a circuit tester such as # PTW2991. Test each wire while the trailer is connected to the tow vehicle and have someone...
    view full answer...
  • Availability of Red LED Tail Lights with a Strobe Feature
    You can get any LED lights to strobe by using the strobe driver, # STR-MRLY. There are 12 different flash patterns so you are sure to find one that is going to work for the school buses. Red lights with a strobe feature are not available with a strobe feature built in.
    view full answer...
  • Wiring Multifunction Light for Use on Rear of Truck
    The Optronics Stop/Turn/Taillight you referenced, part # STL90RB, is intended for use on a trailer that has a 3-wire hook up: ground (white wire), taillights (black wire) and stop/turn lights (red wire). All of the multi-function taillights we offer are shown on the linked page. You'll want to use a circuit tester like # PTW2993 to test the wires on the vehicle to find out what function each one carries. The linked video shows how to use the tester.
    view full answer...
  • Installing a Stop/Tail/Turn Signal Light on the Rear of a Trailer
    One light to rule them all so to speak. Theoretically, you could use any LED stop/tail/turn light. You would have to splice in the left turn and right turn wires to the same brake/turn signal wire on the light you choose to make it light up with both turn signals. However this could cause some bleed over so when the left turn signal is on the right turn signal could light up some. To avoid this you would install diodes in line with the stop/turn wires from the regular trailer tail lights...
    view full answer...

Do you have a question about this Trailer Light?

Info for this part was:

Employee Tyler C
Written by:
Tyler C
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee John H
Expert Research:
John H
Employee Adam R
Expert Research:
Adam R
Employee Laura H
Updated by:
Laura H
Employee Amy B
Updated by:
Amy B
Employee Brian T
Updated by:
Brian T
Employee Noah M
Updated by:
Noah M
Employee Cole B
Installed by:
Cole B

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