Optronics LED Trailer Tail Light - Stop, Turn, Tail - Submersible - 10 Diodes - Round - Red Lens

Optronics LED Trailer Tail Light - Stop, Turn, Tail - Submersible - 10 Diodes - Round - Red Lens

Item # STL42RB

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Optronics LED Trailer Tail Light - Stop, Turn, Tail - Submersible - 10 Diodes - Round - Red Lens Recessed Mount STL42RB
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Product Images

Customer Photos


  • Tail Lights
  • Round
  • LED Light
  • Red
  • Recessed Mount
  • 4 Inch Diameter
  • Submersible Lights
  • Optronics
  • Stop/Turn/Tail
5-1/2" Diameter round. Waterproof trailer light serves 3 functions: stop, turn, and tail. Durable polycarbonate lens and housing. Mounts on trailer with built-in flange. Accepts standard 3-prong plug. Lowest Prices for the best trailer lights from Optronics. Optronics LED Trailer Tail Light - Stop, Turn, Tail - Submersible - 10 Diodes - Round - Red Lens part number STL42RB can be ordered online at etrailer.com or call 800-298-8924 for expert service.


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  • Reviews (149)
  • Q & A (44)
  • Videos (2)
  • Photos
  • Why etrailer?

Optronics Trailer Lights - STL42RB

5-1/2" Diameter round. Waterproof trailer light serves 3 functions: stop, turn, and tail. Durable polycarbonate lens and housing. Mounts on trailer with built-in flange. Accepts standard 3-prong plug.


Features:

  • Red round trailer light serves 3 functions on trailers
    • 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 white LEDs
  • Mounts on trailer with built-in flange - hardware not included
    • Requires a 4-1/2" round hole for installation
  • Accepts industry standard 3-prong plug (A45PB and A47PB - both sold separately)
  • DOT compliant


Specs:

  • Dimensions: 5-1/2" diameter x 1-15/16" thick
  • Distance between mounting holes (center on center): 4-1/4"
  • Diodes: 10
  • Power draw at 12.8V:
    • Stop/turn: 0.413 amps
    • Tail: 0.0.26 amps
  • LIfetime warranty on LEDs


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

Optronics STL42 Series 4 Inch Round LED Light with Mounting Flange Diagram

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.



STL42RB Optronics LED Trailer Tail Light - Stop, Turn, Tail - Waterproof - 10 Diodes - Round - Red Lens

Alternate part number: STL-42RB






California residents: click here


Video of Optronics LED Trailer Tail Light - Stop, Turn, Tail - Submersible - 10 Diodes - Round - Red Lens


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




Video Transcript for Optronics Trailer Lights - Tail 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

Optronics LED Trailer Tail Light - Stop, Turn, Tail - Submersible - 10 Diodes - Round - Red Lens - STL42RB

Average Customer Rating:  4.8 out of 5 stars   (149 Customer Reviews)

5-1/2" Diameter round. Waterproof trailer light serves 3 functions: stop, turn, and tail. Durable polycarbonate lens and housing. Mounts on trailer with built-in flange. Accepts standard 3-prong plug.

- STL42RB
by:

I am replacing the tail lights on my Ranger trailer. The STL42RB is the submersible version. Our local Bass Pro Shop didn't carry the light, neither did the local trailer repair shop (which was a surprise). I found the right replacement online at e-trailer. The lights were delivered in the time frame promised. Everything is great. 611170



- STL42RB
by:

The finished product is great. The lights are much brighter than the original ST42RB. After adding the pigtail, the light fit the existing opening. 196664



- STL42RB
by:

Used to replace incandescent sealed lights on gas delivery truck. LED lights are 100% better and brighter, you can't go wrong. Being seen is no longer a problem, even in inclement weather. Great product from a Great supplier. Order it on your time and it is their before you know 345869


Comments

They still work great. Bright and visible day and night.

Bruce - 02/25/2018

35126

- STL42RB
by:

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
by:

Top quality product. Easy to install. Replaced ancient (41 yr old) incandescent bulb units. 224247


Comments

All the products are fabulous!! Thanks for following up with me. They are in use regularly.

JP - 09/13/2016

20948

- STL42RB
by:

I put these LED lights on my 1967 Scotty. They have a nice clean look, and show up so much better than the originals. The wiring process, with the plug in connections, was easy! 284520



- STL42RB
by:

100 times better than the original lights I had with traditional bulbs. With the LEDs you can see them even better during the day. Which is nice to know that people can see me at all hours of the day. 257650



- STL42RB
by:

Have these on a tow dolly. Old style bulbs bounce loose. These have worked flawlessly for about 5 years in a rental situation. 634696



- STL42RB
by:

Good light bright enough for day time use as well, they always work and that is what matters to me. 629511



- STL42RB
by:

Good product good service I like ordering from E trailer 625695



- STL42RB
by:

Product looks ok havent installed them yet due to the lights dont come with the plug and wires. I guess those are sold separately. Pretty bummed about that. Might be sending back. The taillights should come with the plug and wires. Makes for a hassle. 616525


Comments

As mentioned in the product description, the # A45PB
3-Wire Pigtail for Optronics Trailer Lights - 3-Prong PL-3 Plug - 10" Lead
$1.35
or # A47PB
Right Angle 3-Wire Pigtail for Optronics Trailer Lights - 3-Prong PL-3 Plug - 10" Lead
$1.69
plugs are sold separately.

-- Mike L - 04/03/2019

51423

- STL42RB
by:

I have used etrailer several times for various needs. I am restoring an older steel horse trailer and I wanted to replace all the lights. I did purchase what I needed from etrailer; however, the tail lights came without the wiring harnesses, the amber/ red side lights have no way to mount them. I wish that this would nave been indicated on the notes. Now I need to look into how to get the harnesses and mounts from etrailer. 606591


Comments

We mention in the product description that the plugwiring pigtail is sold separately.

-- Mike L - 02/20/2019

49710

- STL42RB
by:

No mods needed, took the old one out put new one in. 604033



- STL42RB
by:

Everything good 603537



- STL42RB
by:

Quick delivery, products were exactly as described, good quality and fir into the existing opening perfectly. I would order parts from etrailer again without reservations. 600956



- STL42RB
by:

The products I received are exactly as represented on the website. They appear to be of the high quality that I have come to expect from e-trailer. I have ordered numerous things from them over the years and these were shipped promptly and received in a short period of time as is always the case when I order from e-trailer. 599197



- STL42RB
by:

Used these to replace old lights on my horse trailer. Installation was easy and they are very bright. I had issues with a connector on my first order, but the second was just fine. I also had issues with one being dim, but found out it was my trailer plug. Once it was replaced, it was great! Would use these on another trailer if needed. 597335



- STL42RB
by:

Great product, as well as great selection, all at a great price. Even better is their customer service. They exceeded my expectations. They will be my go to shop for future trailer needs for my rangertrail boat trailer. 596878



- STL42RB
by:

I replaced the conventional lamps in my 1990 Peterbilt Midranger box truck. The change out was easy. The previous lamp were troublesome because of vibration, moisture / road salt, causing them to not light. I expect that because these units are sealed, they will provide long and trouble free service. 585787



- STL42RB
by:

nice and bright,no problems with water intrus.ion when backing boat trailer in the water 584052



- STL42RB
by:

Order arrived very timely! Order was correct! Price was very reasonable! What more could you ask for? 582081



- STL42RB
by:

I have only used a few components out of the order. The hub seal seamed loose in the hub for the fit up a good 1/16" . It did fit up to the axle shaft and seal . Bolts and and U bolts for the axle look good . My only complaint is there is no online stock or feedback when things are on back order. I didn't find out until 3 days later. They adjusted and mailed out my order quickly , so no complaints on that . It be nice just to know so I could make plans to purchase anything out of stock from somewhere else when doing a rebuild. Other than that this is my 4th or 5th order and all of them I have been happy with along with the Q/A section and install details are nice that they are easy to find right under the part itself. 567416



- STL42RB
by:

I have been pleased with all of the products that I have ordered from Etrailer. Thank you for your continued good service. 561605



- STL42RB
by:

Excellent value functional light replac ement 555660



- STL42RB
by:

Lights work great, very visible, and were easy to wire once I purchased additional bullet connectors to attach to the lights. It would have been nice if they came with their own pig tails. Also the housings were slightly larger requiring cutting the existing brackets to accommodate them. 547666



- STL42RB
by:

Perfect fit, wiring as described! Perfect upgrade for our 60s Sears Tent Trailer 544867



- STL42RB
by:

The product technical description and video gave me great confidence that the electrical connections were correct for my needs. The part was a perfect match to replace the old one. Great service!! 544405



- STL42RB
by:

The light I purchased was an oem replacement tail light for my boat , perfect fit and easy installation. Thank you for the fast shipping and the great price for this product. 539709



- STL42RB
by:

Still working great! 539456



- STL42RB
by:

Exactly what was ordered and shipped fa st. 524860



- STL42RB
by:

Lights were a perfect fit to replace stock tail lights on my 2018 Montana 5 th wheel. very bright compared to stock.Fast shipping and excellent customer service. Next time I need something for my trailers I will look here first. 513130



- STL42RB
by:

Product excellent. Paid for two day shipping. It took four. Shipping not so good. 502915



- STL42RB
by:

Well built and good quality as advertised well satisfied. 497232



- STL42RB
by:

Thanks... the light is perfect and at a great price. The other place wanted $26.00 for the same light and you charged much less. I highly recommend etrailer.com for parts. 497105



- STL42RB
by:

Super fast delivery. Great company! 496465



- STL42RB
by:

Lights were just as expected. Had to enlarge mounting holes in 2014 Alpine 5th wheel to install but I knew that going into the upgrade. They could have engineered these to mount in a hole with 1/4" smaller dia. and they would be perfect for upgrading from the incandescent lights. Like the fact they are 100% plastic so no more rust problem as with old lights. 495855



- STL42RB
by:

Product is the unit I ordered. Took a while to get here but it has been installed and is ready for testing. 495583



- STL42RB
by:

Great product, exactly as described. Great customer service, would definitely do business again. 489983


Comments

Everythings just fine! Like them w/out any problems.

Jean - 03/28/2019

51146

- STL42RB
by:

Great looking product but it was a bit hard to install, because while most of the light is low profile the pig connection actually sticks up quite a bit making it hard to fit in our application. Your install may vary, but be aware of it. 489974



- STL42RB
by:

These LED tail lights are bright and a snap to install with the simple 3 prong plug. Thank you. 486691



- STL42RB
by:

Very impressed with the purchase of your products. Fit like a fine pair of leather gloves and arrived on time as promised. Impressed with sales representative, Natalie. Was very helpful throughout the purchase as well as very skilled and knowledgeable with product specifications that she sells. Your entity should be proud to have such a person on your staff. Thoroughly enjoyed the product videos. Very impressed and very informative. My buying experience with your entity was quite rewarding and will have no hesitation referring all my ranching friends to your company and the wide selection of products that you offer. Keep up the good work! A satisfied customer! 482052



- STL42RB
by:

The product arrived on time and was as advertised. It is a perfect replacement for the tail lights on my camper. 480710



- STL42RB
by:

They are a perfect replacement for my trailer lights which are old and starting to rust. I have not replaced them yet, I am waiting for a sunny day or two. 476891



- STL42RB
by:

Excellent 466725



- STL42RB
by:

Excellent product 466721



- STL42RB
by:

Just what I needed. Received very quickly & great communication. 465473



- STL42RB
by:

I purchased the LED identification lights and the round LED lights for my horse trailer. I shopped around and found etrailer to be the best value. I am 100% satisfied with the lights and customer service. Thanks 464774



- STL42RB
by:

Good quality. 463995



- STL42RB
by:

Fits just I wanted. Thanks 459310



- STL42RB
by:

All items are of good quality. Very well packaged. Shipping was fast. Like Arnold said " I WILL BE BAAAACK!" 457888


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Ask the Experts about this Optronics Trailer Lights
Do you have a question about this Trailer Light?


  • Replacement LED Trailer Light to Reduce Power Draw
  • The Optronics LED Trailer Light # STL42RB is not what I could call an exact replacement for the # ST40RB but for all purposes it will be what you're looking for. The # STL42RB is 1/8 inches larger in diameter and 3/8 inches deeper so at the most you may need to do a little filing to the opening for the light in your trailer to install it. The mounting flange is metal. There is also a Stainless Steel Trim Ring # A5TRSSB available. It does not include a gasket, however If you would...
    view full answer...

  • Replacement Tail Light For Forest River Georgetown XL RV
  • I'd be happy to assist you. It sounds like you need the Sealed, Flush Mount Tall Rectangle LED Trailer Stop, Turn and Tail Light, Grommet and Plug, 12 Diode # STL34RB but most of the pictures I see have round tail lights like the Sealed, 4" Round, LED Stop/Turn/Tail light, 21 Diode - Red # STL55RB. If this is not the correct part, then send me a photo with the measurements of the light and we will get you what you need. The numbers and letters that are actually printed on the light...
    view full answer...

  • Availability of 3-Prong Pigtail Plugs with Load Resistors
  • The Optronics Round LED Trailer Stop, Turn and Tail Light # STL42RB does use a 3-prong plug for electrical connection. We offer right-angle 10-inch pigtail plug # A47PB and straight pigtail plug # A45PB. Neither of these includes a load resistor, which can be required on some wiring systems to mimic the higher electrical resistance of standard incandescent lights. Some turn signals will hyper-flash when used with LED lights because the wiring does not "see" the load from the super-high-efficiency...
    view full answer...

  • Replacement Tail Light for 2009 Ranger Boat Trailer
  • Sometimes it is possible to replace a broken trailer light with one that uses a different type of installation but since we offer a very wide range of lights you may very well be able to find an exact OEM-style replacement. It sounds like you have a light like # STL42RB which has a 3-hole mounting flange. I linked our main page for trailer tail lights of all shapes and sizes. On the page you can simply click on the filters for light shape, light type (LED or standard bulb), lens color,...
    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...

  • Replacement Tail Light Assembly For 2005 Airstream Trailer
  • We offer several lights and may have just what you are looking for that will fit your 2005 Airstream. Thank you for the photo of your lights. You will want to take a measurement to be sure you get a light that will match the housing you are installing it in. if you remove a light you may be able to get the part number of the light assembly. If you cannot find the part number you can measure the opening and mounting holes to make sure we get a light that will work. The light assembly...
    view full answer...

  • 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...

  • 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...


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Info for this part was:

Expert Research:
Robert G
Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
John H
Expert Research:
Adam R
Video by:
Kathleen M
Updated by:
Laura H
Installed by:
Cole B
Expert Research:
Jeffrey L
Video Edited:
Chris R
Updated by:
Sarah W
Photos by:
Stacy F
Installed by:
Andrew S
Updated by:
Brian T
Updated by:
Hannah L

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