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GloLight LED Trailer Tail Light - Stop,Turn,Tail - Submersible - 21 Diodes - Round - Red Lens

GloLight LED Trailer Tail Light - Stop,Turn,Tail - Submersible - 21 Diodes - Round - Red Lens

Item # STL101RB
Our Price: $18.94
Trailer Lights
Shipping Weight: 0.33 lbs
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4-5/16" Diameter x 2-3/16". 3-Function, waterproof light acts as brake, tail, and turn light. GloLight lens creates a solid panel of light. Recessed mount with grommet (sold separately). Accepts industry-standard 3-prong plug. Great Prices for the best trailer lights from Optronics. GloLight LED Trailer Tail Light - Stop,Turn,Tail - Submersible - 21 Diodes - Round - Red Lens part number STL101RB can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (1278)
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Optronics Trailer Lights - STL101RB

  • Tail Lights
  • Round
  • LED Light
  • Red
  • 4-5/16 Inch Diameter
  • Recessed Mount
  • Stop/Turn/Tail
  • Submersible Lights
  • Optronics

4-5/16" Diameter x 2-3/16". 3-Function, waterproof light acts as brake, tail, and turn light. GloLight lens creates a solid panel of light. Recessed mount with grommet (sold separately). Accepts industry-standard 3-prong plug.


  • Round trailer tail light serves 3 functions
    • Turn signal light
    • Tail light
    • Brake light
  • GloLight lens creates a solid light pattern with a smooth appearance
    • Outer band of LEDs functions as tail light
    • Center red LEDs act as turn signal and brake light
  • Sonically sealed, waterproof housing and lens unit is submersible
  • Durable surface-mount technology (SMT) construction of LED circuit board
    • Better withstands shock and vibration
    • Allows improved heat distribution and thinner construction
  • 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
  • Red lens over white LEDs
  • Polycarbonate housing and acrylic lens
  • Recessed mount with grommet (A45GB - sold separately)
  • Accepts industry-standard 3-prong plug (A45PB or A47PB - sold separately)
  • DOT compliant
    • Meets FMVSS 108 and CMVSS requirements for automotive lighting


  • Quantity: 1 combination tail light
  • Dimensions: 4-5/16" diameter x 2-3/16" deep
    • Light diameter: 4"
  • Diodes: 21
  • Power draw at 12.8 volts:
    • Tail light: 0.145 amps
    • Stop/turn light: 0.375 amps
  • Lifetime warranty on LEDs

Optronics STL101RB GloLight Red LED Trailer Tail Light Dimensional Diagram

Innovative GloLight Design

Optronics Glow light

This red LED light serves as a trailer tail light with stop, turn, and tail functions. The light gives your truck or trailer a distinctive look that's completely street legal. This Optronics GloLight has a unique solid light pattern when lit, so your lights stand out from the rest. Optronics GloLights are a great way to add both style and value to your truck or trailer.

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.

LEDs vs. Incandescent Lights

The long-lasting, cool-burning LEDs make this light the perfect replacement for incandescent vehicle and trailer lighting. LED lights are more efficient, use less power, and last much longer than incandescent lights.

Surface Mount Technology

The surface-mount technology used to construct these lights protects the LEDs from shock and vibration better than through-hole technology because the diodes are soldered directly to the surface of a printed circuit board instead of attached with wires that run through holes in the board. The result is a circuit board that is smaller yet provides more routing area and that offers superior performance, reliability, and durability.

PL-3 Wiring Connection

Back of Optronics Glow light showing standard 3-prong plug mount

This GloLight has a standard 3-prong plug as pictured above. A 3-prong pigtail adapter (A45PB or A47PB - sold separately) is required to connect this light to your vehicle or trailer. An optional mounting bracket is also available (BK45BB - sold separately) to make it easier to mount the light on your trailer.

Recessed-Mount Light

Recessed mount light

Recessed-mount trailer lights install underneath a housing or a grommet (A45GB - sold separately). These lights will extend into the mounting surface and require that a hole be cut into your trailer.

STL101RB Optronics Glow Light LED Trailer Combination Tail Light - Stop,Turn,Tail - Submersible - 21 Diodes - 4" Round - Red Lens - Standard PL3, 3-Prong Plug

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Customer Satisfaction Score:

Customer Reviews

GloLight LED Trailer Tail Light - Stop,Turn,Tail - Submersible - 21 Diodes - Round - Red Lens - STL101RB

Average Customer Rating:  4.8 out of 5 stars   (1278 Customer Reviews)

4-5/16" Diameter x 2-3/16". 3-Function, waterproof light acts as brake, tail, and turn light. GloLight lens creates a solid panel of light. Recessed mount with grommet (sold separately). Accepts industry-standard 3-prong plug.


These LED stop, turn, tail lights are an exceptional upgrade. They halo is a great feature and blinker lights are very bright! I truly believe these lights have made my unit safer!!!


I have purchased scores of products online over the years, but this experience was by-far the best. Your website is well organized, well informed, and easy to navigate. The purchasing process went very smoothly, and the products that I purchased were competitively priced. The shipping and delivery was faster than estimated (and frankly, faster than I expected). The shipment arrived well packed, undamaged, and the contents were exactly as advertised. Thank you for a great experience...I'll be back to purchase again!


Product was delivered on time and meets my expectations for quality. I would buy this again and from eTrailer because of their service.


I've installed Optronics LED stop/tail/turn lights on a previous truck. They held up extremely well. A large advantage of changing from incandescent to LED is people do see the signaling better. In this truck and the last one I owned, people have been more likely to share the road with me when merging into another lane. The GloLite feature isn't necessary, but quality LEDs are. Some LEDs aren't built that well; Optronics is very high quality and hold up extremely well under hard use and vibration.


Still working great over a year later. Perfect fit and well sealed from weather.


Huge upgrade. Brighter, draw less power quality sealed unit. Brake turn signal is seperate from running light.

John S.


Still look and work like the day I installed. Brighter safer smarter. I duck hunt so the trailers in and out of the salt water all winter. Everything fails in the saltwater these have not.


Great replacement taillights. Will be installing more of these in all our trucks. Thumbs up



Liights are holding up very well. Still very bright. The Halo and LED combo is really cool. Everyone wants them in their truck now.


Here's the pic of my finished project. Thanks for ur help.


Just received the tail lamps. The weather is preventing me from installing them right now but I connected a power source to one of them to test the light. WOW are they bright!! The stop/ turn is very bright and will definitely work well once installed.
Great product and very good customer support. I am a satisfied customer.


As always fast and wonderful service from etrailer. These lights are exactly what I needed. So much brighter and safer than what I had on there before. Easy to install, plug and go! Thanks etrailer!


Although rubber gasket did fit into my 4 7/16" hole the LED tail light did not fit with gasket installed. I had to make my hole 4.5" and then I had to apply a lot of force to get the tail light installed into the rubber gasket.


Great lights - easy install and they are very bright at night and great in the daylight. Outside circle serves as parking lights at night. Good purchase.


These lights are better than I expected. Very bright and showy. I will never have to worry about someone running into the back of me because they didn't see my taillights!


Working well the trailer is parked out in the weather all year and the grommets are not hard of cracking


It came. With no mounting bezel.

Etrailer Expert

Heather A.


Thank you for your review. The light does not come with a bezel, the grommet is part # A45GB. You will also need the 3-wire pigtail part # A45PB.


Replacements for my car dolly trailer. Great upgrade!


etrailer as always has what I need, ships fast, and product is "as advertised"!
A pleasure to talk to the tech's when I have questions and even go as far as calling manufacturer to verify equipment selections.
Keep up the GREAT work.


Awesome products


webpage easy to use. product is nice and good quality. shipping quickly in safe packaging. One problem--I ordered the wrong light, so I had to return it for another one!! Great customer service.


These lights are just the look I was after for my Jeep. Not the run-of-the-mill, every day LED tail light.


Nice and bright on the tow dolly


Easy to install. Look really slick. Awesome lights.


Great product. Very bright and love the halo with the led effect. Putting them on all of our trucks now.



Lights are great. Still working and bright.


Light looks great. Much brighter than the incandescent light I replaced. Would purchase this product again. Fast shipping.


These have a clean look and come with what appear to be stainless screws and a gasket.

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • Correct 4" Diameter Trailer Tail Glo Lights
    I was able to confirm that what you're looking for is the GloLight LED Trailer Tail Light part # STL101RMB.
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  • Availability of Optronics LED GLOLight with Red Outer Ring and Amber LEDs in Center
    Optronics does offer a GLOLight that's amber in color, part # STL101AB. The outer ring functions as running lights and the center LEDs function as turn signals. It's hard to tell by the photo, but the LEDs in the # STL101RB lamp you referred to are all red. The outer ring functions as the running light, and gets brighter when the brakes are applied. The center section lights up for the brake and turn signal functions. We don't offer a lamp of this type with yellow or amber LEDs. If you'd...
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  • Replacement Taillights for Ranger FF3725 Boat Trailer
    I believe your trailer was originally equipped with Truck Lite model 30,40 or 44 taillights that could either be mounted into a grommet that would bring its overall diameter to just over 5-3/8 inches in diameter. I'll link you to the grommet and surface mounted round LED taillights we offer that are around 5 inches long. Hopefully you'll be able to visually match up the lamp. I'd still like to confirm exactly what you had, so sending a photo attached to an email reply would be very helpful....
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  • Replacement 4 inch GloLight Trailer Light Recommendation
    It sounds like you are looking for the GloLight Trailer Tail Light # STL101RB which is a 4 inch diameter GloLight trailer light. I attached a review video for you to check out as well.
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  • Surface Mount Trailer Clearance Light Availability
    For what you are looking for a surface mount light like the part # STL43RBX would probably be a better option as it doesn't require a bracket and it does stick out a little bit.
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  • Could Optronics GloLight Trailer Taillight STL101RB Be Wired for Stop/Turn/Tail Circuits
    The GloLight LED Trailer Tail Light # STL43RB you referenced can be used for the application you mentioned. It's a dual intensity light which means that the lower intensity would cover the running lights and the brighter one would cover the stop and turn circuits. There isn't a way to operate the ring around the outside of the light separately. You'd want the harness part # A45PB to install the light. White wire is for ground, black wire is for running lights and red would be for stop...
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  • Does Trailer Light STL101RB Require Rubber Grommet to Install with A45SB
    You do not need to use a rubber grommet for the # STL101RB to install using the mounting flange part # A45SB which you also referenced. Those two parts together would be all that you need.
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  • Enlarging 4-3/8 Inch Hole to 4-1/2 Inches for Optronics GloLight With Rubber Grommet
    The GloLight LED Trailer Tail Light - Stop,Turn,Tail - Submersible - 21 Diodes - Round - Red Lens # STL101RB along with the grommet # A45GB requires a 4-1/2 inch cutout. I recommend using a rotary tool like a Dremel or a manual metal file to evenly enlarge the holes to that size. I recommend drawing the hole side on the RV and then make sure to use fine sand paper or file so you don't take off more material than you desire.
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  • Will Optronics GloLight LED Tail Light # STL101RB and Grommet Fit 4-3/8 Inch Cutout
    The GloLight LED Trailer Tail Light # STL101RB referenced in your question, when used with the Rubber Grommet # A45GB, is designed to fit a 4-1/2 inch cutout on the trailer. Since your opening is just a tiny bit smaller at 4-3/8 inches, you should have no problem fitting the grommet on your trailer and you shouldn't have to make any additional modifications. I have attached a couple short video demonstrations on these products that you can also check out.
    view full answer...
  • LED Replacement for Peterson 420-15 Trailer Light
    I do have an option for you but the GloLight LED Trailer Tail Light part # STL101RB most likely won't fit into the mount you have welded to your trailer. The actual outside diameter of the light is 4.25". The recessed portion behind the lens on the base is around 3.80" which I think is what you are asking for so I went out to our warehouse to confirm this for you. If you need to replace the light you have now then you can use the Peterson Round Trailer Tail Light part # 431800 or part #...
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    Image 1 for
  • Glo Light Trailer Tail Light Installation With Grommet
    You will install the GloLight LED Trailer Tail Light - Stop,Turn,Tail - Submersible - 21 Diodes - Round - Red Lens # STL101RB after you install the grommet # A45GB in the bumper first. This ensures the mount is in place correctly and the light will then hold firmly in place.
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  • Compatibility of Optronics Trailer Tail Light # STL43RB With Trailer 4-1/2-Inch Opening
    The Optronics Trailer Light # STL43RB that you referenced can mount using rubber grommet # A45GB. But this light's overall diameter is 4-5/16-inches so this light unit would be too large to allow for grommet mounting in your trailer's 4-1/2-inch opening. However, my contact at Optronics confirmed that this mounting grommet # A45GB will fit a 4-1/2-inch rough opening and with it you can use the other light you referenced, part # STL101RB, which is 4-inches in diameter. If you need a wiring...
    view full answer...
    Image 1 for
  • Replacement Round 4-1/4 Inch Grommet Mount Trailer Stop/Turn/Brake Lamps
    The closest lamp we offer to what you describe would be the Optronics # ST45RB. The lamp measures 4-1/4 inches in diameter at its largest, and the lamp installs into a 4-1/2 inch rough opening using the rubber grommet which is available separately as part # A45GB. If the 4.25 inch mounting diameter you refer to represents the diameter of the rough opening that the lamp installs in, this lamp will be a bit too large so you'd need to either enlarge the hole by 1/4 of an inch. The 3 pin plug...
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  • Replacement Reverse Light for Ranger z521 Boat Trailer
    I have a solution that may work for you, but we do not currently have any 3" diameter submersible reverse lights. Have a look at the Optronics Backup Light # BU45CB which is a 4-1/4" diameter light that can be mounted to your trailer using mounting bracket # BK45BB. You will also need the 2 wire pigtail # A45CB to replace the wiring from your old lights and plugs into the back of this Optronics light. I've attached a photo that outlines the dimensions of the light to see if you can match...
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  • Is 2004 Subaru Forester Trailer Wiring Harness Strong Enough for Yakima Rack and Roller Trailer
    If your Yakima Rack and Roll trailer was made after October 2010 then that would mean it has LED lights on it. LED lights draw very little power compared to incandescent lights and using them and 2 additional lights are well within the abilities of the trailer wiring harness on your 2004 Subaru Forester Turbo. Even if the lights were not LED, the lights on older versions of the Rack and Roll trailers would likely not be enough power draw to be a problem, even considering adding 2 more...
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Do you have a question about this Trailer Light?

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Zack K
Video Edited:
Zack K
Employee Andrew L
Video Edited:
Andrew L
Employee Chris R
Video Edited:
Chris R
Employee Tricia G
Written by:
Tricia G
Employee Cole B
Installed by:
Cole B
Employee Wilson B
Updated by:
Wilson B
Employee Brian T
Updated by:
Brian T

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