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

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

Item # STL101RCB
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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. Lowest Prices for the best trailer lights from Optronics. GloLight LED Trailer Tail Light - Stop,Turn,Tail - Submersible - 21 Diodes - Round - Clear Lens part number STL101RCB can be ordered online at or call 800-298-1624 for expert service.
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  • Reviews (1029)
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  • Why etrailer?

Optronics Trailer Lights - STL101RCB

  • Tail Lights
  • Round
  • LED Light
  • Red
  • 4 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 and clear lens over white LEDs
  • Polycarbonate housing and tinted acrylic lens
  • Recessed mount with grommet (A45GB - sold separately)
  • Accepts industry-standard 3-prong plug (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 Glow lights dimensions 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.

STL101RCB Optronics Glow Light LED Trailer Combination Tail Light - Stop,Turn,Tail - Submersible - 21 Diodes - 4" Round - Clear Lens - Standard PL3, 3-Prong Plug

California residents: click here

Video of GloLight LED Trailer Tail Light - Stop,Turn,Tail - Submersible - 21 Diodes - Round - Clear Lens

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

Video Transcript for Optronics GloLight Trailer Lights Manufacturer Review

Brett Johnson: (silence)The Glolight is the stunning combination of premier lighting technology, meeting world-class style and capabilities. The introduction of the Glolight series represents the first truly different approach in years to the visual presentation of stop-tail-turn lamps.Most LED lamps have hotspots or patterns of bright light. Glolight lamps are visually distinctive from other LED lamps, because their lenses diffuse the light, giving them a smooth, bright, glowing appearance.The Glolight optical technology is so different, it's patentable. And Optronics has 35 new products with Glolight technology in its pipeline, right now. Mudd: Lighting is one of the most visibly predominant features on any vehicle, and this is a completely different looking yet highly effective light. We're focused on integrating the latest technology into our manufacturing process, and these new lights clearly represent the innovative partnership between Vanguard and Optronics.

Innovation is important to Vanguard, our customers, and our industry. Robert: Glolight technology looks different because it is different. Different in its optical approach and different all the way down to the circuit boards.We designed and manufactured all of our lamps using the most advanced engineering techniques, and test them in our own world-class, state-of-the-art optical testing facility. Lamps are engineered to resist everything, from shock, to dust, to high-velocity water spray. We're committed to designing and manufacturing erosion-resistant LED lighting products.

And Glolight lamps are produced using solid state, surface-mount device, or SMD, technology.Most LED lamps sold in the heavy duty market today, use what is typically referred to as "through hole" construction. Optronics LEDs are mounted directly to the surface of the circuit board, eliminating exposure to connecting points. LED lamps with SMD technology, like Optronics' new Glolight, are so robust that they can continue to function even if their circuit board is completely submerged in water. The unique Glolight lenses and housings are made of tough polycarbonate material that is sonically welded to create an impermeable seal. Glolight lamps meet all FMVSS 108 and SAE photometric requirements for visibility and safety.

And our lamps are tested at a certified, independent laboratory.I guess it's redundant to say this, but our lamps come with a lifetime warranty. Roush: There's nothing out there that's as eye-catching and effective as these Glolight lamps. Vanguard is always drawn to component supplier products that contribute to our customers' efforts to operate more effectively and safely. Glolight lamps just look different and more noticeable. And that means better safety.

Brett Johnson: With world-class manufacturing facilities, harness making capabilities, and a global market presence, Optronics is now changing the competitive landscape in HD lighting. We always have access to a lighting manufacturer with global sophistication, fleets are enjoying increased product availability, and everyone is befitting from new, innovative technology and the industry's most competitive pricing structure. With Glolight, Optronics is sending a signal that things have changed in the HD lighting industry.

Customer Reviews

GloLight LED Trailer Tail Light - Stop,Turn,Tail - Submersible - 21 Diodes - Round - Clear Lens - STL101RCB

Average Customer Rating:  4.8 out of 5 stars   (1029 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 are some pretty sweet lights. Very bright and attention getting. I am constantly getting compliments on them. The High Points- - I bought the standard 3 prong style, works just fine with a Truck-Lite plug and with a no name one I had lying around. - When not using driving lights both the outer and inner lights flash for turn signal. Don't remember reading about that, but it's pretty sweet(at least for the people behind me!). - All 4 arrived in excellent shape and with all lights working. Now, for the only negative that I can come up with- - 2 of the lights have what I think is a sliver of white plastic stuck between the outer circle and the cover. I'm guessing it's from pressing the halves together. They can't be seen until you're very close to them, but for a $28 light it's a bit disappointing for that to get past QA. Regardless, I highly recommend these, they are very distinctive and so far I haven't seen anyone else with them. Can't wait to be able to afford 4 more!


I ordered LED type tail lamps for my trailer. Take NOTHING for granted! I did that and received two tail lamps with no wiring, no plug-in connecter. Also no way in which to mount these lights. Needed was a rubber, round mounting that I have since ordered along with the needed connector plugs. Had the sales person asked a few questions this second parts order could have been avoided.

Curt, thank you for your review. This lights are not sold with the rubber grommet or pigtail. The grommet is part # A45GB
Rubber Grommet for 4" Round Trailer Lights - PVC
and the pigtail would be part # A45PB
3-Wire Pigtail for Optronics Trailer Lights - 3-Prong PL-3 Plug - 10" Lead
or part # A47PB
Right Angle 3-Wire Pigtail for Optronics Trailer Lights - 3-Prong PL-3 Plug - 10" Lead
-- Etrailer Expert Heather A - 05/15/2018


I would echo what another reviewer wrote about quality control. When I micro analyze it you can see many fine scratches/imperfections on the red plastic which sits under the clear lens. No one should ever be that close to it to notice but they are there. I just hope the clear lens itself doesn't attract scratches easy but time will tell..... The good thing about these are that they create visual interest and change the look of the trailer for the better. Day time visibility is increased 1000x vs the faded old single incandescent lights I had. Obviously great at night as well. I ordered the corresponding rubber surrounds but couldn't get them to fit. Off the trailer they fit like a glove but the combo proved just a bit too thick in the trailer cutout. Of course it is freezing cold here, when it warms up I will heat up the surrounds to make them more plyable and try again.


Hi would Like to say I never give reviews on stuff , but this company is great to deal with , i had a problem with a order , I gave them the wrong address auto correct changed my address with out me catching it , I called and the Lady on the other end was very help full and guess what spoke English!! No out of country hard to understand customer service! She was very helpful and kind .im going to be a repeat customer for shure , order shipped fast and the lights I ordered are top notch

Had the lights on my semi trailer for a year no problems look great ! I had a few people ask where I got them I did not hesitate to tell them !
John - 03/20/2018


This is a beautiful light - can't wait to get it installed on our fiberglass egg! It's nice to have the flexibility of mounting it in the shell or the bumper as we will mount temporarily on the bumper for transport and then move to a flush mount later for the permanent installation.


These lights are fantastic and still going strong

The lights are as good today as when purchased. Plus great follow-up support
Tom D - 04/02/2019


Just as advertised....Wish I would have known there was a bracket available before I ordered them. I had to pay shipping twice because of separate orders.


Great light & SERVICE'' thanks

just like a timex watch takes a licking
JOHN M - 07/27/2015


Review from a similar GloLight in Trailer Lights

Upgrading our 1998 Coleman Grandview, the old incandescent just seemed too dim. Nice light, only suggestion would be to list some wiring options, was a bit confusing going from the old Bargman to the new LED. But I read through the Bargman page here and got squared away. Pic is LED before anchoring compared to the stock on the right. BIG improvement.

Still great, nice and bright. They are a huge improvement over the factory incandescent signals.
Derek J - 07/19/2021


Review from a similar GloLight in Trailer Lights

This one is for the “driver” side. It has the lens on the bottom for lighting the license plate. (It does not include the license plate holder. I like this one because you just push in the wires. I recommend this light.

No worries
Theodore - 02/20/2021

- STL178RK1B

Review from a similar GloLight in Trailer Lights

These work great and the Glo-light looks very nice. I installed these on my tow dolly as the original LED's went bad from shorted wiring. These fit great and are excellent quality and the E-trailer team is excellent to deal with. Never an issues!

Dale - 02/27/2022


Review from a similar GloLight in Trailer Lights

I mounted these vertically for an extra set of tail lights on my 14' utility trailer. I'm a firm believer in good visibility by others when towing. Very pleased with them.

I dont use this trailer often, but the lights are still performing well. Good purchase and I continue to recommend them.
William - 03/11/2022

- STL178RB

Review from a similar GloLight in Trailer Lights

I installed them on the upper rear of my Casita trailer for better visibility as the OEM lights were to low.

Great! now people can see what Im going to do, turn or stop
Julien - 01/30/2022


Review from a similar GloLight in Trailer Lights

Excellent upgrade to LED backup lights! So much brighter than the faded and UV damaged original lights! Very happy with these lights!

- STL101RB

Review from a similar GloLight in Trailer Lights

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!!!


Review from a similar GloLight in Trailer Lights

I really like the bright back up lights. It does take a little extra work for the back up lights. - Sorry this pic doesn't show the backup/stop lights but this is the great little chuckwagon we put them on.

- STL111RB

Review from a similar GloLight in Trailer Lights

These lights were added to my cargo trailer that I pull behind my motorcycle. These help to make sure that people see me when I am on the road. The lights were easy to install with the grommets and pigtails that I ordered at the same time. All the products worked together well and made the project easy to do. Love these lights and will buy more if needed.

- STL111RB

Review from a similar GloLight in Trailer Lights

Really nice light that stands out from the rest. Way brighter than my original trailer lights ever were! Easy install, great fit, and fast shipping. I’m an e trailer customer for life!

- BUL111CB

Review from a similar GloLight in Trailer Lights

Great Light! Put two on the back of a toyhauler for backing up. You will need the grommet and pigtail to do it right. I had to cut two oval holes for mounting in trailer frame. Take your time with the layout and get the right sized hole saw, makes installation pretty easy.


Review from a similar GloLight in Trailer Lights

Ordering From etrailer was a great Experience. Pat was very helpful over the phone when I called to ask questions about a set of lights I was interested in and even helped me place my order. Shipping was fast and everything they shipped was in flawless condition. My lights and harnesses are still going strong. Thank you!


Review from a similar GloLight in Trailer Lights

Perfect! I installed these on my golf cart as dash under glow lights. They were inexpensive & seem like they will hold up well. It really is a simple as drilling a 3/4” hole then pushing in the grommets then lights. One wire to the light switch & one to a ground, super easy.

- STL117RB

Review from a similar GloLight in Trailer Lights

Worked great on my boat trailer for about 3 months then the top and bottom led bars went out….which is why I had to buy this replacement in the first place.

I will have our customer service team reach out to you. The light has a limited lifetime warranty on the LED lights.
-- Etrailer Expert Jenny N - 02/04/2022


Review from a similar GloLight in Trailer Lights

Products that I purchase from etrailer are great. Have never had any issues with anything that I purchased from etrailer.

- STL178RK1B

Review from a similar GloLight in Trailer Lights

The Optronics surface mount light (STL178RK1B) was easy to install and the 22 LED diodes provide exceptional light. The light fits snug on the trailer bracket and the foam gasket provides extra protection.


Review from a similar GloLight in Trailer Lights

Great bright lights, I added these to my cargo trailer to light up the area behind it when backing at night. Great products.

Show More Reviews

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