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Trailer Lights > Tail Lights > Submersible Lights > LED Light > 5 Inch Diameter > Round > Red > Flange Mount > Optronics


Sealed, 4" Round LED Trailer Stop, Turn and Tail Light, Flange Mount, 3-Function, 10 SuperDiode

Optronics Trailer Lights

ratingratingratingratingrating (57 reviews)


Code:   STL42RB

Price:$16.95


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Shipping Weight: 1 pounds

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Optronics Trailer Lights - STL42RB

5-1/2" Diam x 1-15/16" D; Sealed, waterproof; flange mount on 4-1/4" centers; 3-prong plug connection; 10 super diode LEDs

Sealed, 4" Round LED Trailer Stop, Turn and Tail Light, Flange Mount, 3-Function, 10-Super Diode

This is a sealed, round LED combination stop, turn, and tail light. The LEDs in this light are super diodes for exceptional brightness and performance. This red light measures 5-1/2" in diameter by 1-15/16" deep, including the flange. Lens and housing are one unit that is sonically sealed and waterproof, providing protection to the 10 super light-emitting diodes. The light draws 0.413/.026 amps at 12.8 volts. This light flange mounts through the three mounting holes spaced equally on the flange at 4-1/4" apart. A separate, industry standard, three-prong plug is used for the wiring connection to easily upgrade from incandescent lights. A three-wire pigtail is required to complete the installation.

  • Red, round trailer light is a combination stop, turn, and tail light
  • Sealed, waterproof housing and lens unit
  • 10 Super LEDs (Light Emitting Diode)
  • Accepts industry standard, 3-prong plug
    • Simple to upgrade from incandescent lights
  • Flange mounts through three holes in housing flange on 4-1/4 centers
  • 3-wire pigtail required for complete installation
  • Dimensions: 5-1/2" Diam x 1-15/16" D
  • Light draws 0.413/.026 amps at 12.8 volts

Manufacturer Cross Reference
Light will work as an exact replacement for:
Truck Lite # 44326R
Grote # 53292
Peterson # M418R-2

Manufacturer Specifications

Sealed, flange mount stop, turn and tail light. 10 super diodes for bright, dependable performance. Features sonically sealed, waterproof lens and housing in a single unit. Accepts industry standard, 3-prong plug for easy retrofit of incandescent lights. Requires plug for complete installation.

dimensions of LED light

STL-42RB 2-wire, 4" Round Sealed LED Stop, Turn or Tail Light - 10 diode 0.413V/0.026A by Optronics, Inc.







Video of Sealed, 4" Round LED Trailer Stop, Turn and Tail Light, Flange Mount, 3-Function, 10 SuperDiode


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

Video Demo Optronics Trailer Lights STL42RB
Optronics Trailer Lights STL42RB Review

Video Transcript for Optronics Trailer Lights STL42RB Review

Today were reviewing part number STL42RB from Optronics. This is a sealed round stop, turn and taillight for your trailer. Were going to turn off our overhead lights and Ill show you how this works. Thats your taillight and I dont know if you can see, but all ten of the super LEDs are lighted. Now for your brake pedal, theres your brake light, and I dont know if you can see it but the six LEDs on the outside of the unit shine more brightly than the four LEDs in the center to make it super bright, and that should capture, definitely should capture the attention of the drivers behind you and hopefully keep you a little safer on the road. Heres your turn signal and for that also the six LEDs on the outside will shine more brightly.

Now we can turn our overheads back on and I can show you some other features of this light. First of all it does use a standard three-prong plug. Today were using this pigtail, part number A45PB, and this part is sold separately. Im going to put that aside for now so I can show you some features of this light. First of all as you can see it is flange mounted and it is sealed so there should be no water coming in there.

So thats a good thing. Also, because its flange mounted it will be harder for someone to steal this light off of your trailer, and because its flange mounted also its easier to retrofit your incandescent lights that youre using now. So its real easy to switch to LEDs, and as you probably know, LEDs burn thousands of hours as opposed to a couple of hundred hours for incandescent bulbs, and they also burn more coolly than incandescent bulbs. Theyre not so hot so thats an advantage also. Let me show you some of the measurements on this unit.

The light itself is 4 inches in diameter. With the flange mount its 5 inches in diameter, and its 4 inches between mounting holes from center to center. It has three mounting holes. Now lets turn this over and look at some of the measurements on the back. From the surface mount here to the flat top of the unit is 1 inch.

Now if you measure from the surface mount to the top of the socket for the pigtail thats 2 inches so the total depth is 2 inches. Now if youd like, you can use this steel mounting bracket thats sold separately. Your application may even require that you use it. This is part number BK45BB and the flange mounted light fits in very snuggly so nothing should be leaking in there. And, that is it for part number STL42RB, the round stop, turn, and taillight with ten super diodes made by Optronics.




Customer Reviews

Sealed, 4" Round LED Trailer Stop, Turn and Tail Light, Flange Mount, 3-Function, 10 SuperDiode - STL42RB

Average Customer Rating:  ratingratingratingratingrating4.8 out of 5 stars   (57 Customer Reviews)

5-1/2" Diam x 1-15/16" D; Sealed, waterproof; flange mount on 4-1/4" centers; 3-prong plug connection; 10 super diode LEDs


- STL42RB

ratingratingratingratingrating by: Peter S06/20/2014


After my wife has been nagging me for the last few years to fix her custom 5th wheel horse trailer I finally decided to take the plunge. Replaced the old light with these great new LED lights. Super bright and look great. LED lights are very sensitive to ground. This trailer has living quarters as well and the manufacturer made it of tube aluminum then used a torch to cut holes to run the wires in the tubes. The jagged edges over time have caused numerous shorts which all had to be tracked down and wire repaired as needed. When you have a large system that may have a short you can tell when you plug the trailer into the vehicle and the engine drops rpms. This trailer has fuses that once they reach a certain temp they turn off and then will come back on after they cool off. I'm very familiar with my trailer today 136716






- STL42RB

ratingratingratingratingrating by: Wayne H.07/29/2013


Have used this light before on my boat trailer and although it installs easily, the last one didn't seem to last very long. I am not sure how long they should last, but it couldn't have been more than a few years. The company service and website is excellent and a great source for the necessary parts one needs. I also enjoy their tutorials. 92198






- STL42RB

ratingratingratingratingrating by: Whitewater William08/30/2011


Replaced old post mount trailer lights with these flange mount LED submersibles. No more popped bulbs and bloody fingers from replacing them in rusty sockets every time I put the boat in the water. Great service, nice folks at etrailer.com. Thank you 23168






- STL42RB

ratingratingratingratingrating by: Chris R10/25/2013


This product should come with the pigtail for 17.00 dollars you can buy the light with the pigtail at the local farm supply. If nothing else it should be much more clear when you select this item it does not come with the pigtail 105215






- STL42RB

ratingratingratingratingrating by: Robert H Bardes02/24/2014


Received order very quickly. Lights are excellent and exactly as described. Already installed on trailer and they are great. Will keep e-trailers web site as a mainstay in my favorites to maintaining my trailer. 117377






- STL42RB

ratingratingratingratingrating by: Rick07/10/2012


Lights work as designed. Had no problems with installing on utility trailer or testing. Have not had a chance to use at night yet. I am guessing they will be much brighter than the old lights. 47392






- STL42RB

ratingratingratingratingrating by: Andy W09/09/2013


Replaced my old tail lights on my pop up with these super bright LED taillights. If you have trouble with the lights flickering, make sure the ground wire is fastened tight. Fit was perfect! 98960






- STL42RB

ratingratingratingratingrating by: Randolph E.02/26/2014


Bought a 3 wire to 2 wire converter and changed the tail lights to the new LED. The turn signals still wouldn't work so I replace the flasher and all is perfect. I am HAPPY, HAPPY, HAPPY! 117808






- STL42RB

ratingratingratingratingrating by: jimmy G.09/26/2013


Just got through installing, they really look great. They are a lot brighter than the old ones and the best price I could find. I got two for what most wanted for one. Thanks 101660






- STL42RB

ratingratingratingratingrating by: Tom T02/21/2011


We are installing them now and they look like they will do the job perfectly. Hope they last a long time because the individual bulb type seem to break all the time. 7560






- STL42RB

ratingratingratingratingrating by: Randy08/07/2014


I have had a good experience by buying from this company. I would recommend them for all of their products. I will make purchases from them again. 144880






- STL42RB

ratingratingratingratingrating by: Mike h07/19/2013


Direct replacement for my taillights on my stone ridge 5th wheel Rv. Simply plug in. Noticeably brighter. Excellent service from e trailer. 90411






- STL42RB

ratingratingratingratingrating by: Brian T03/15/2011


The lights were excellent and installed easily as well as look great. They are much better than the originals. Thanks, Brian 9407






- STL42RB

ratingratingratingratingrating by: Chris06/12/2013


Lights are huge, no chance of anyone not seeing the trailer with them on! Very bright and exactly as described. 84232






- STL42RB

ratingratingratingratingrating by: Craig S.08/06/2013


Nice light, but they need to include the connector with a pigtail so you can connect to existing wiring. 93543






- STL42RB

ratingratingratingratingrating by: Russ R02/02/2014


A good replacements for an old stock trailer I have. Fit the hole nice. Got the best price on web. 115437






- STL42RB

ratingratingratingratingrating by: Brian R.05/21/2013


Good quality and the terminals are packed with dielectric grease to prevent corrosion. 81299






- STL42RB

ratingratingratingratingrating by: KS Rancher08/06/2011


LED's are really bright, wires are labeled, everything I expected out of the product 21232






- STL42RB

ratingratingratingratingrating by: Brian W.12/20/2011


Quick delivery, great service. Haven't hooked up yet, but should be perfect. 28371






- STL42RB

ratingratingratingratingrating by: Alex M.09/09/2013


It is a great product, reasonable price and good service. Thanks! 99006






- STL42RB

ratingratingratingratingrating by: Mike Z06/07/2011


Installed last night in 30 seconds and works perfect. Thanks. 16328






- STL42RB

ratingratingratingratingrating by: Donald W.12/07/2013


Really like the helpful info your website provides. 109488






- STL42RB

ratingratingratingratingrating by: Hank K02/05/2012


Lights are excellent easy install nice and bright 31094






- STL42RB

ratingratingratingratingrating by: Bill09/17/2012


Great fast delivery and product exactly as shown 54927






- STL42RB

ratingratingratingratingrating by: Core Autosport06/29/2011


Great Light matches what we have on our trailer. 18170






- STL42RB

ratingratingratingratingrating by: JAMES P.10/23/2012


LOOKS GOOD ON MY ENCLOSED TRAILER,I LIK E. 58005






- STL42RB

ratingratingratingratingrating by: Adam03/04/2011


Great product should come with harness. 8421






- STL42RB

ratingratingratingratingrating by: Raymond06/23/2012


Great Light, etrailer.com is the best 45404






- STL42RB

ratingratingratingratingrating by: Jim C.11/25/2013


fast delivry 108399






- STL43RB

ratingratingratingratingrating by: Bradley V.02/25/2013

Review from a similar Optronics Round LED Trailer 3 Function Light


eTrailer.com did a Terrific Job for us! We needed tail lights for the Dune Buggy we're building in three different collors (red, amber & clear), and eTrailer was able to provide these for us in otherwise identical lights. We received everything we needed (all of the right appurtanances) and they look great! We were also impressed with the timeliness of etrailer.com's shipping and delivery, as we received our order far more quickly than promised or anticipated. The License Plate Holder and Light also look great! (Although the light is a little dim.) Overall high marks, and I would use eTrailer.com and Optronics again. 67757






- STL43RB

ratingratingratingratingrating by: Charllie D06/28/2012

Review from a similar Optronics Round LED Trailer 3 Function Light


I am in the process of renovating a 1966 Airstream. I wanted to upgrade the tail lights and the clearance lights. I found etrailer.com on a web search. I ordered the round 4" LED, rubber 4" grommet, and Oval LED clearance light. The round stop with grommet adapeted perfectly into the lens on the Airstream. I will feel so much safer now with the added visability. The lights are stellar. 45989






- STL43RB

ratingratingratingratingrating by: Rick V.04/15/2013

Review from a similar Optronics Round LED Trailer 3 Function Light


I got two of these because one of the lights on my trailer had been cracked when I lent it out and subsequently the running light no longer worked. The lights that they replaced were standard incandescent bulbs and I didn't like the fact that I couldn't just replace the bulb as they were sealed units like these. Because these are led's I expect them to last quite a bit longer so the fact that they are sealed also is not as much of a problem and in reality should help them last longer. 76206






- STL53RCB

ratingratingratingratingrating by: Mike d11/12/2013

Review from a similar Optronics Round LED Trailer 3 Function Light


I am a truck driver and bought these for my trailer I had a 5 to 7 day delivery and they gave me a 3 to 5 delivery free of charge so it arrived with in 3 day's and I was glad cause I couldn't wait to put them in my trailer was all ready wired for these kind of lights so it only took me about ten minutes to install they looked great with my black trailer and even better at night the led were extremely bright I will be ordering more service was excellent 107104






- STL43RB

ratingratingratingratingrating by: Stan N.06/11/2014

Review from a similar Optronics Round LED Trailer 3 Function Light


I checked with several RV parts locations in our area including CW and this product was not available. Etrailer.com made ordering so easy and what service! I received an immediate order confirmation and the shipping confirmation arrived very quickly too. I just received my delivery and the installation has been completed. Thanks guys for such great customer service! 135063






- STL43RB

ratingratingratingratingrating by: Paul J.05/11/2011

Review from a similar Optronics Round LED Trailer 3 Function Light


While I haven't actually used them on a trip yet, I have to say that installing the LED stop/turn/tail lights was almost a no-brainer. Once I figured out the correct sequence, the lights easily slipped into the existing rubber housings. I plugged in the electrical connectors and they worked perfectly. Knowing that they'll never burn out is comforting. 13433






- STL43RB

ratingratingratingratingrating by: Gary01/15/2013

Review from a similar Optronics Round LED Trailer 3 Function Light


The lights are great. I wish there was instructions on how to install the light and gasket. There must be some trick to it; gasket first then light, gasket and light then install through the sheet metal by pulling the gasket lip through the hole. I did the latter and experienced some gasket tearing. There must be a simple way to do this. 63107






- STL43RB

ratingratingratingratingrating by: Eldon03/08/2013

Review from a similar Optronics Round LED Trailer 3 Function Light


This was to replace tail stop/turn light on my 5th wheel. Different pattern but works excellent and is actually a little brighter than what was replaced. However, service and delivery was absolutely fantastic. Would highly recommend e-trailer service. I will definitely use e-trailer again. 69670






- STL63RCB

ratingratingratingratingrating by: Anthony S.03/08/2011

Review from a similar Optronics Round LED Trailer 3 Function Light


You guys had some good prices and pretty quick shipping. Thanks for products! 8759






- STL23R24B

ratingratingratingratingrating by: Jason V.09/03/2013

Review from a similar Optronics Round LED Trailer 3 Function Light


Good light. Used in ElDorado National bus, which uses 24 volt lights. This was about the only place I could find them. Thanks!!! 97930






- STL53RCB

ratingratingratingratingrating by: Jlynch02/13/2012

Review from a similar Optronics Round LED Trailer 3 Function Light


The tail/brake lights arrived today it looks to be made of quality materiel, also it will look good on my 1971 IH Scout 31798






- STL43RB

ratingratingratingratingrating by: Rory K.02/21/2013

Review from a similar Optronics Round LED Trailer 3 Function Light


I have inspected all the items ordered, and think they are all very nice. Thank's for the extra quick service 67204






- STL43RB

ratingratingratingratingrating by: Mark S04/18/2014

Review from a similar Optronics Round LED Trailer 3 Function Light


The lights replaced old faulty ones. They were an exact replacement and lit up nice and bright. 125951






- STL43RB

ratingratingratingratingrating by: Steve02/17/2014

Review from a similar Optronics Round LED Trailer 3 Function Light


Great product. Sealed well - handles all the salt and snow Wisconsin can handle. 116788






- STL43RB

ratingratingratingratingrating by: James G.11/12/2012

Review from a similar Optronics Round LED Trailer 3 Function Light


Fast service. Hard installation. Lights at rear if tow trailer. 59246






- STL43RB

ratingratingratingratingrating by: Dave M06/21/2013

Review from a similar Optronics Round LED Trailer 3 Function Light


Exact replacement for our bus tail lights. Great service. 85517






- STL43RB

ratingratingratingratingrating by: Jay B12/03/2012

Review from a similar Optronics Round LED Trailer 3 Function Light


Super easy install, Super bright and a VERY easy upgrade. 60573






- STL43RB

ratingratingratingratingrating by: Bob O08/07/2014

Review from a similar Optronics Round LED Trailer 3 Function Light


Much brighter then the old stop and signal lights. 145005






- STL43RB

ratingratingratingratingrating by: Bob O07/02/2014

Review from a similar Optronics Round LED Trailer 3 Function Light


Much brighter then the original incandescent lamps 138894






- STL53RCB

ratingratingratingratingrating by: wlvrns9507/29/2013

Review from a similar Optronics Round LED Trailer 3 Function Light


Great product. Looks great. Very easy to install 92158






- STL43RB

ratingratingratingratingrating by: David S.12/22/2012

Review from a similar Optronics Round LED Trailer 3 Function Light


Good Quality and Price. Fast Delivery. 61850




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Show More Reviews

Ask the Experts about this Optronics Trailer Lights
Expert Answers about Sealed, 4" Round LED Trailer Stop, Turn and Tail Light, Flange Mount, 3-Function, 10 SuperDiode - STL42RBDo you have a question about this Trailer Lights?


  • How to Connect the # STL42RB Tail Lights to a 1958 Trailer with 2 Wire Lighting System
  • The 4 inch Round Sealed LED Stop, Turn or Tail Light, item # STL42RB, uses a 3 wire pig tail, item # A47PB or # A45PB, to connect to your existing trailer wiring. The plug on the pigtail plugs into the back of the tail light and is then hard wired to your trailer wiring. It sounds as if your original tail lights were grounded to the trailer frame through their mounting studs, so a third wire was not needed. When connecting the 3 wires from the 3 wire pig tail, you will ground the...
    view full answer...

  • Flush Mount Stop Turn and Tail Lights for a 1982 13 Foot Scamp Travel Trailer
  • I did a bit of research on your trailer and the reflect-o-lite light that you mentioned. It looks as if they are surface mount lights that are 6-7/8 inch diameter. For a replacement you could use the 7 inch round Transit LED Stop/Side Marker/Tail Light, # STL90RB, to have a somewhat original appearance, with an upgraded LED light. You could also use a surface mount like the Bargman LED, Surface Mount, Double Tail Light, # 47-84-610 which would be large enough to cover the original mounting...
    view full answer...

  • Backup Lights Similar To the Optronics 4 Inch Round LED Trailer Light # STL42RB
  • The closest backup light that we carry to the 4 Inch Round LED Trailer Light, # STL42RB, is the 4 Inch Round LED Backup Light, # BUL11CBX. This is a 4 inch round clear back up light that has an overall diameter of 5-3/4 inches and a depth of 1-5/8 inches. This light will require a standard 2 prong plug, # A45CB, and has a reflector on the mounting flange.
    view full answer...

  • Could Use a Trailer Light Mounting Bracket with a Sealed 4 Inch LED Stop Light
  • Yes, I went out into our warehouse and pulled a Sealed, 4 inch Round LED Trailer Stop # STL42RB and a Trailer Light Mounting Bracket # BK45BB and found that they work together very well. All of the mounting holes from the # STL42RB line up with the # BK45BB. You would need bolts that have a diameter of no more than 3/16 of an inch to attach the light to the bracket. I attached a picture to the right that shows how these products would look if installed together. You might also...
    view full answer...

  • Availability of LED Amber and Red Clearance, Tail Lights, and Side Marker Trailer Lights
  • The STL42RB does come in amber. It is # STL42AB. Use wiring harness # A45PB with it. For 2 inch diameter amber lights you can use # MCL50AB with # A49PB and # A54GB. For 2 inch diameter red lights you can use # MCL50RB with # A49PB and # A54GB. For amber teardrop lights, you may be able to use # CBL22AB. We also have a teardrop shape kit that you would use on the roof of a truck, # CB-15AK, but it is not LED. For red teardrop lights we also do not have an LED option but we do...
    view full answer...

  • Is there a Trailer Tail Light that Matches Peterson Back Up Light # 411SC
  • We do not have an exact match for a red round tail light like the Peterson Back Up Light, # 411SC, that you have referenced that is a flange mount. The closest flange mounted lights are going to be the Peterson round tail lights # 431800 and # 432000. For a flush mounted light, you could use # 429800 which may be more what you are looking for. We also have the Optronics brand flange mounts # STL42RB or # ST47RB. They use wiring harness # A45PB.
    view full answer...

  • Will Optronics Trailer Tail Light # STL42RB Fit a 1974 Blair Horse Trailer
  • I went out to the warehouse and pulled an Optronics tail light, # STL42RB to measure the back to determine the size hole you would need. The trailer would need, or you would need to cut, a 4-1/2 inch diameter hole. The lights will fit the 4-5/8 inch mounting hole. You would also need a pig tail harness # A45PB.
    view full answer...

  • What Size Hole Should be Drilled to Install a 4 inch Optronics Clearance Light
  • You would want to drill a 4-1/2 inch hole to install the 4-inch Optronics Trailer Light # STL45RB. You will also need a Straight 3-Wire Pigtail # A45PB to wire in the # STL45RB.
    view full answer...

  • What is the Power Draw of Optronics LED 4 Inch Round Trailer Tail Light # STL42RB
  • Because tail light # STL42RB has more than one function it has more than one amperage draw rating. Brake lights and turn signals draw more power so that will be the higher draw at 0.413 amps. Running lights use less power and would be the 0.26 amps. If you have the running lights on and then step on the brake, the brake light overrides the tail light. If you have the brakes on (with or without the running lights on) the turn signal will override the brake light on that side. So the...
    view full answer...

  • Trailer Light And Mounting Bracket Recommendation
  • The Optronics light, part # STL42RB, you are asking about uses the mounting holes in the included flange for mounting. This light features 10 Super LED lights and has a sealed, waterproof housing and lens kit. The mounting holes in the flange are spaced 4-1/4 inches apart center-to-center. We do have a mounting bracket, part # BK45BB, for a 4 inch light but the mounting holes are spaced 4 inches center-to-center. If you wished to drill the holes in the bracket to match the holes in the...
    view full answer...

  • Sealing Up Around a Trailer Tail Light Using Tail Light # STL42RB On an Airstream Trailer
  • You could use a gasket maker like # LT37464. You would just need to put a small bead of the gasket maker around the outer most flange on tail light # STL42RB. I have included a picture to show you what this would look like. You could also use silicone # 0160297 around the light and at the mounting holes after you have installed it.
    view full answer...

  • Converter Recommendation to Install Combined Taillights on a Flatbed Truck that had Separate Bulbs
  • It sounds like you need to convert the separate wiring of your 1991 Nissan truck to a combined setup to work with the Round LED Taillight # STL42RB. For this you will need to get a Roadmaster Brite-Lite Wiring Converter # RM-732. You will run the wires from your vehicle to the right side of the # RM-732 by function, and then from the left side of the box you will run the corresponding left or right turn signal wire to the red wire of the # STL42RB. The tail light circuit will bypass...
    view full answer...

  • Troubleshooting Running Lights Circuit on a Travel Trailer Tail Light Harness
  • Since you have tested the 4-Way connector on your vehicle and it is working properly, it leads me to believe that the wiring of the lights is incorrect. You will want to make sure that the fuse for the running lights on the vehicle is not blown. It sounds to me like the lights you have only have two wires coming out of the back for wiring to the trailer connectors wiring. If this is the case then the red wire will connect to the yellow (left) and green (right) wires on the trailer lights....
    view full answer...


Info for this part was:


Expert Research:
Robert G

Expert Research:
Michael H

Expert Research:
Jameson C

Expert Research:
John H

Updated by:
Laura H

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