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Miro-Flex LED Tailer Light w/ Reflector - Brake, Tail, Turn - Submersible - Rectangular - Red
Optronics

Miro-Flex LED Tailer Light w/ Reflector - Brake, Tail, Turn - Submersible - Rectangular - Red

Part Number: STL35RB
In Stock
$27.50
Retail:$32.99
You Save: 17%
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5-5/16" Waterproof light with a built-in reflector displays brake, tail, and turn signals on your trailer. It mounts in a cutout with a grommet (sold separately) and works with 3-prong plugs. Great Prices for the best trailer lights from Optronics. Miro-Flex LED Tailer Light w/ Reflector - Brake, Tail, Turn - Submersible - Rectangular - Red part number STL35RB can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Optronics Trailer Lights - STL35RB

Highlights

  • One Light, 3 Functions: Provides brake, tail, and turn signals for full rear visibility.
  • Reliable In Any Weather: Sealed, waterproof housing keeps water out for submersible use.
  • Bright, Efficient LEDs: 14 red diodes use only 0.301A stop/turn and 0.020A tail at 12.8V.
  • Built-In Reflector: Miro-Flex design boosts light output and visibility without extra parts.
  • Fits Cleanly: 5-5/16" x 3-7/16" recessed mount installs with grommet A33GB (sold separately).
  • Road Legal: Meets DOT, FMVSS 108, and CMVSS 108 standards for compliant lighting.

Features to know about

Brighter, Longer-Lasting Upgrade: 14-Diode Miro-Flex LED Light

Swapping out old incandescent lights for this Miro-Flex LED tail light makes an instant difference. Fourteen red LEDs glow bright for tail lights, then kick up another notch for brake and turn signals. They draw only 0.301 amps at 12.8 volts when braking or signaling and just 0.020 amps for tail lights, so they’re efficient and easy on your electrical system. Plus, the LEDs are built to last with a lifetime warranty—no more chasing bad bulbs or weak light output.

Built to Handle Water and Weather: Fully Sealed and Submersible

If your trailer ever hits wet roads or the boat ramp, this light is ready. The housing and lens are sonically sealed into a single waterproof unit that keeps moisture out completely. It’s submersible and corrosion-resistant thanks to its durable, all-weather polycarbonate body. Even after repeated dunkings, the LEDs stay protected and reliable, so you can tow with confidence in any conditions.

Clean Fit and Easy Mounting: Recessed Design with Standard Connections

This rectangular light measures 5-5/16" long x 3-7/16" tall x 2-5/16" thick and mounts flush in a cutout using the grommet A33GB (sold separately). The standard PL-3 connector accepts either the straight pigtail A45PB or the right-angle A47PB, depending on your setup. It’s an easy retrofit for older lights that used the same style plug—just pop it into the grommet, plug it in, and you’re done.

Close-up image of Optronics PL-3 three-prong trailer light plug showing electrical connector used for Miro-Flex LED light installation.

Modern Look with Added Safety: Built-In Reflector and DOT Compliance

The Miro-Flex faceted reflector design doesn’t just look sharp—it boosts light output for better visibility from all angles. The built-in reflector means no extra parts are needed for compliance or reflection on the road. It meets FMVSS 108 and CMVSS 108 standards, so you know it’s fully DOT compliant right out of the box.

Specs

Dimensions

  • Length: 5-5/16"
  • Height: 3-7/16"
  • Thickness: 2-5/16"

Technical diagram of Optronics Miro-Flex STL35RB LED trailer light showing rectangular dimensions and mounting depth for brake, tail, and turn signal functionality.

Electrical

  • Power draw at 12.8 volts (Stop/turn signal light): 0.301 amps
  • Power draw at 12.8 volts (Tail light): 0.020 amps
  • Diodes: 14

Warranty

  • LEDs: Lifetime warranty

STL35RB Optronics Miro-Flex Combination LED Trailer Taillight - 16 Diodes - Red Lens

Alternate part number: STL-35RB





Customer Satisfaction Score:

Ratings & Reviews

4.8

854 reviews
Review sort icon
5-5/16" Waterproof light with a built-in reflector displays brake, tail, and turn signals on your trailer. It mounts in a cutout with a grommet (sold separately) and works with 3-prong plugs.

by:

Lights are great, shipping was quick.



by:

As advertised. Sure are bright !! A great upgrade from incandescent bulbs.



by:

Easy to order, fast shipping, easy to install…
Video
was the key!



by:

Parts arrived quickly & worked perfectly for our Thule transport cargo box.



by:

Recieved my order a day sooner than I thought and everything was what I thought was! I highly recomend etrailer!!!



by:

Great replacement/upgrade for my 2003 Continental Cargo trailer.



by:

Haven't installed the parts ordered yet but the shipment was correct and on time. good customer service. Will use etrailer.com again if I need hard to find parts.



by:

Perfect replacement for stock bulbs in Thule rear mounted cargo carrier. Super easy to replace. Order shipped same day and made it here in one day. Awesome service!



by:

Had to force in to the rubber mount and the fixture took-a-licking and kept on ticking. Great item - ps: used on custom truck bed, not on trailer.



by:

this item looks well made, but I was disappointed it did not include the PL 3 plug with it



by:

Looks and works way better than the factory lights on my Thule Transporter Combi.



by:

They fit my Thule hitch mounted cargo box perfectly. Hoping the LED lights will last longer than the original Thule ones.



by:

My experience has been without any negative issue. Etrailer kept me informed during the entire shipping process. Delivery was ahead of schedule. I have only had the tail lights for one day. The installation was not very difficult. So far, everything is meeting my expectations. Thank you.



by:

After dealing with Thule reps and home office it is refreshing to deal with
JB at etrailers.
I had a warranty issue with Thule, of course they have no replacement parts, thus no warranty. A great business plan no cost warranty on their end.
JB took excellent care of me, I will not hesitate to recommend etrailer to all.
I replaced boythtaillights on my combi box.



by:

Fit perfectly On my Thule Transporter. There was no need to order anything else, it was a true plug-and-play. I went with these because a while back, one of my old lights went out and I replaced it with OEM lights, a day or so later, the other old light gave out.

I ended up buying the pair of these. I’m very happy with these so far.
I can’t give it a 5-star because I haven’t owned them long enough. Time will tell if they last.



by:

etailer has everything, even these tail lights for my Thule hitch Terrapin Cargo Box to replace the original sealed incandescent Tail Light Units.



by:

Perfect fit for my Thule combi carrier. Time will tell if LED are more durable. Recommended!



by:

Fit perfectly in Thule hitch box, offers a much brighter output than the original halogen, and makes me feel better about the lights’ survival after potential submersion in water. I had to replace because a halogen light went dead. A steep on the price, but eTrailer was no different than any other place and etrailer was great, as usual. I prefer to support etrailer than [online vendor].



by:

Perfect fit for my hitch pod. Looks great also



by:

Looks and works great! Arrived ahead of time !

Jeremy profile picture

Jeremy

6/23/2025

Works great! Perfect replacement!



by:

Great price, arrived quickly, fits the existing Thule Combi grommet, wiring and cutout. Very simple and easy to install.



by:

These were a fairly easy replacement for the OEM tail lights in the Thule Transport 665. Once the liner was removed and the lights were removed from the weather gaskets, it was simple matter of switching to the LED lights - no changing wires or other MacGyver-ing needed!



by:

Great , easy to install



by:

Amazing lights worked perfectly plug-in play not only that but their customer service 10 out of 10 beyond happy!



by:

I appreciate eTrailer for all things that attach to a hitch. They have been more than helpful for parts to update/repair second hand/eBay/Marketplace purchases. From RV stuff to my new hitch mounted spare & rack. Quick response from customer service!


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See what our Experts say about this Optronics Trailer Lights

  • Recommended Submersible Miro-Flex LED Tailer Light w/ Reflector that's 5-5/16" by 3-7/16"
    Hey Maina. The Miro-Flex LED Tailer Light w/ Reflector item # STL35RB is sold individually. This is a sealed LED light that is submersible and provides brake, tail, and turn signals. It measures 5-5/16" long by 3-7/16" tall. It has 14 diodes built into it so it's going to be quite a bit brighter than an incandescent light and last at least 25 times as longer. You can use the following parts to get it installed you'll need one for each light as they are sold individually as well: Grommet...
    view full answer...
  • Replacement Light for a Thule Transporter Cargo Carrier
    Hey Eric. The Miro-Flex LED Tailer Light w/ Reflector item # STL35RB has been used for years to replace/upgrade the lights that came with the Thule Transporter cargo carrier. It measures 5-5/16" x 3-7/16" x 2-5/16" deep and is sold individually. You'll want to use either the Right Angle 3-Wire Pigtail for Optronics Trailer Lights item # A47PB or the 3-Wire Pigtail item # A45PB to install the light. What specific Thule cargo carrier do you have? If you could put that information where...
    view full answer...
  • Replacement Tail Light for a Thule Terrapin or Thule Transporter Hitch Mounted Cargo Box
    The replacement tail light for the Thule Terrapin cargo box is # TH05252. This is an incandescent light. There isn't an official LED light made for it but you could potentially use # STL35RB. It measures 5-5/16 inches by 3-7/16 inches and is 2-5/16 inches deep overall. I have linked a video review of this light for you.
    view full answer...
  • Replacement LED and Incandescent Lights for the Thule Transporter
    Yes, the LED light part # STL35RB can be used to upgrade the lights in a Thule Transporter Hitch Mounted Cargo Carrier part # TH665C. I went out to the warehouse and test fitted the LED lights inside the original grommet that comes with the Transporter part # 05253. The pigtail that comes with the Transporter part # TH05254 fits the LED lights so there will not be an issue plugging the new lights in.
    view full answer...
  • Replacement LED Light Assembly for Thule Transporter Cargo Carrier
    It's true! We (and other customers - see review below) have found that the Micro-Flex LED Tail Light # STL35RB works great as a replacement for the stock assemblies on the Thule Transporter Combi Cargo Carrier. LEDs typically last significantly longer than standard incandescent bulbs so you really shouldn't have to worry about replacing them. I wouldn't be surprised if they outlasted the carrier itself. I have attached a short video review as well.
    view full answer...
    Image 1 for
  • Running Lamp Circuit on Thule TH665C Transporter Combi Cargo Carrier Not Working
    The taillights on the Thule # TH665C Transporter Cargo Carrier should function as brake lamps. turn signals and running lamps. It sounds like you have a problem with the running lamp circuit, as the license plate lamp is on the same circuit. I'd first test the trailer connector on the vehicle while the headlights are on. A simple circuit tester like # PTW2993 works well for this. Check the pin on the connector that's fed by the brown wire. If you're not getting power on that wire with...
    view full answer...
  • Flush Mounted LED Lights for Flatbed Trailer
    Thank you for the photos; based on what you showed, you would want oval LED lights that are in the 6-1/2" x 2" range, though you would need exact dimensions to ensure the right fit. For example, # STL72RB is a red oval light that measures 6-7/16" x 2-5/16" x 1-3/4" deep while # STL70RB is another red oval light but with dimensions of 6-1/2" x 2-1/4" x 1-1/8" deep. The same will apply for your white oval lights, such as the 6-1/2" L x 2-1/8" W x 1" # BUL72CB. The other lights look to be...
    view full answer...
    Image 1 for Image 2 for
  • Recommendations for installing a LED Trailer Light # STL35RB on a 2002 Ranger Trail Trailer
    This Miro-Flex, Waterproof, Rectangular, LED Trailer Stop/Turn/Tail Light # STL35RB that you referenced should work well with your trailer wiring. You will need a Straight 3-Wire Pigtail # A45PB to wire it into your trailer wiring. The red wire from this harness will run to the turn signal circuit, the black is the tail signal, and the white will ground to the trailer frame on a clean metal surface to complete the circuit. You might also be interested in purchasing a Grommet for ST33...
    view full answer...
  • Grommet and Pigtail Needed for the Optronics Miro-Flex # STL35RB Trailer Light
    The grommet that you will want to use to install the Optronics Miro-Flex # STL35RB is the Optronics part # A33GB. For a pigtail you have 2 different options. The 3-Wire Pigtail for Optronics Trailer Lights part # A45PB has a straight connector and the Right Angle 3-Wire Pigtail for Optronics Trailer Lights part # A47PB has a right angled connector.
    view full answer...
  • What Size Hole is Needed to Mount the Optronics Tail Light # STL35RB
    With the Tail Light, # STL35RB, inside of the appropriate grommet, # A33GB, you would need a hole that is approximately 5-7/16 x 3-3/4 inches. You will also need the appropriate wiring harness, # A45PB.
    view full answer...
  • Can the Miro-Flex LED Trailer Light be Mounted Vertically and Horizontally
    As long as you have adequate room to mount the Miro-Flex, Waterproof, Rectangular, LED Trailer Stop/Turn/Tail Light # STL35RB you could mount it in basically any orientation you like. You might also be interested in purchasing a Right Angle 3-Wire Pigtail # A47PB or a Straight 3-Wire Pigtail # A45PB depending on your mounting location. Or a Grommet # A33GB for mounting.
    view full answer...
  • Depth Dimension of Optronics Miro-Flex LED Trailer Stop/Turn/Tail Light STL35RB
    The actual depth of the Optronics Miro-Flex LED Trailer Stop/Turn/Tail Light # STL35RB is 2-5/16-inches, as shown in the linked diagram which includes overall dimensions too, but you will also need to allow for the right-angle plug # A47PB which will add another inch. This light is intended for installation using rubber grommet # A33GB.
    view full answer...
    Image 1 for
  • Would the Optronics Trailer Lights # STL35RB Meet IP67 Waterproof Rating
    A submersible light such as # STL35RB is sealed and waterproof. This light is not given an IP rating but if to get an IP rating of 67 something must meet NEMA code 6 then these lights would do the trick as they are sealed and waterproof.
    view full answer...

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Info for this part was:

Employee Tyler C
Written by:
Tyler C
Employee Lindsey S
Updated by:
Lindsey S
Employee Amy B
Updated by:
Amy B
Employee Wilson B
Updated by:
Wilson B
Employee Brian T
Updated by:
Brian T
Employee Amanda K
Updated by:
Amanda K
Employee Jameson C
Expert Research:
Jameson C
Employee John H
Expert Research:
John H
Employee Adam R
Expert Research:
Adam R

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