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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 # STL101RFMB
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Our Price: $28.54
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Optronics Recessed Mount Trailer Lights - STL101RFMB
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5-1/2" Diameter x 1-1/2". 3-Function, waterproof light acts as brake, tail, and turn light. GloLight lens creates a solid panel of light. Surface mount with built-in flange. Requires adapter for weathertight plug. Lowest Prices for the best trailer lights from Optronics. GloLight LED Trailer Tail Light - Stop,Turn,Tail - Submersible - 21 Diodes - Round - Red Lens part number STL101RFMB can be ordered online at etrailer.com or call 800-298-1624 for expert service.
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Optronics Trailer Lights - STL101RFMB

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

5-1/2" Diameter x 1-1/2". 3-Function, waterproof light acts as brake, tail, and turn light. GloLight lens creates a solid panel of light. Surface mount with built-in flange. Requires adapter for weathertight 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
  • 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 surface-mount technology (SMT) construction of LED circuit board
    • Better withstands shock and vibration
    • Allows improved heat distribution and thinner construction
  • Red lens over white LEDs
  • Polycarbonate housing and acrylic lens
  • Mounts on surface of trailer with built-in flange - hardware not included
    • Requires 4-1/2" hole in trailer for flange to sit flush
  • Weathertight connection point on back of light requires adapter (AL45PWTB - sold separately) to work with industry-standard 3-prong plugs
  • DOT compliant
    • Meets FMVSS 108 and CMVSS requirements for automotive lighting


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

Optronics STL101RFMB GloLight Red LED Trailer Tail Light Dimensional Diagram

Innovative GloLight Design

Optronics Glow lights lit around the edge

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.

Weathertight Wiring Connection

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

This GloLight has a weathertight plug as pictured above. This type of connection is designed to help block out moisture. A 3-prong pigtail adapter (AL45PWTB - sold separately) is required to connect this light to your vehicle or trailer. The built-in polycarbonate mounting flange makes it easy to install the light. Three screws (not included) are required.

Surface-Mount Light

Surface mount light

Surface-mount lights install flat against the surface of the trailer, so a hole does not need to be cut into the trailer for the light. This type of light is installed using a flange or bracket that has mounting holes. And mounting hardware is used to secure the light to the trailer.

STL101RFMB Optronics Glow Light LED Trailer Combination Tail Light - Stop,Turn,Tail - Submersible - 21 Diodes - 4" Round - Red Lens - Weatherproof 3-Prong Plug

California residents: click here

Video of GloLight LED Trailer Tail Light - Stop,Turn,Tail - Submersible - 21 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 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 - Red Lens - STL101RFMB

Average Customer Rating:  4.8 out of 5 stars   (962 Customer Reviews)

5-1/2" Diameter x 1-1/2". 3-Function, waterproof light acts as brake, tail, and turn light. GloLight lens creates a solid panel of light. Surface mount with built-in flange. Requires adapter for weathertight plug.


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!


Always a pleasure doing business with etrailer. I can get these where I work for cost +xx but they're cheaper from etrailer. Always have excellent prices.


Thanks for the great lights! I will be ordering another set of ambers for a dust light while on the trails.


Nice bright center 6 LEDs. Glow effect for running lights looks awesome especially when you have every light a glo light gives a more custom look.


I like the lites


Worked as expected. High quality product. Needed a bright light and this one delivers. Love the halo effect. Makes our horse trailer light up like a Christmas tree at night.


Love your products , this my third orde r!



These lights are awesome! Glad I made this purchase. What a difference!


nice product, good price, fast delivery,thumbs up



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

- 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

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


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!


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.

- 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

Lights are bright! Very high quality. Very smooth and consistent fan of light. Makes all the difference in the world on the back of my truck.


Review from a similar GloLight in Trailer Lights

Ordering the part I needed was very easy. The price was clearly stated, and when I got to the payment men my portion, so were the shipping options. It arrived when promised, and was exactly what I needed. Overall, I had a great shopping experience.

I cant believe its been a year since I ordered this. Weve had a lot of rain this year, and the parts I ordered still look like the originals. Im still very happy with the purchase and would these folks again!
BobT - 08/26/2021

- MCL157AB

Review from a similar GloLight in Trailer Lights

I have a Triton trailer which had a blown out incandescent tail light. I decided to upgrade all the lights to LED. It took me only 30 minutes to change out all 13 lights. I used a little silicone spray and a small screwdriver and the old lights came right out of the rubber grommets and the new lights fit perfect. They are really bright and makes a big difference, glad I did the upgrade!


Review from a similar GloLight in Trailer Lights

Perfect replacement the high clearance running lights on a 2019 Newmar Dutch Star. Easy replacement, super bright. !

- BUL111CB

Review from a similar GloLight in Trailer Lights

Great Quality and great service. The LEDs are bright and just simply cool looking. They get everyone's attention during the day and really wicked looking at night! I highly recommend etrailer I use them again and again!!


Review from a similar GloLight in Trailer Lights

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!


Review from a similar GloLight in Trailer Lights

The lights are good and standard size, but they seem to have a slightly off plug receptical. I ordered 6 of them and all seemed to be the same. I had to bend my connectors with a pliers a little bit to get them plugged in.

- 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.

Show More Reviews

Ask the Experts about this Optronics Trailer Lights

  • How to Determine Replacement Tail Light for 2004 Ranger Boat Trailer
    From what I could find it looks like a 2004 Ranger boat trailer uses round tail lights so something like the Optronics GloLight LED Trailer Tail Light # STL101RFMB could potentially work. Since I don't have specs on your tail lights though I'll need you to confirm the dimensions of your trailer tail lights prior to getting a replacement. The light I mentioned above has an overall diameter of 5-1/2" and the light itself has a 4-5/16" diameter. If you have something different please let...
    view full answer...
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  • Diameter of Optronics # STL101RFMB GLOLight LED Stop/Turn/Taillight
    The 4 inch diameter listed is for the lens, while the entire diameter of the unit, including the mounting flange is 5-1/2 inches. The lamp is designed to fit in a 4-1/2 inch diameter hole. If installed in a 4 inch hole, the mounting flange would not be flush against the mounting surface. If you could enlarge the hole by 1/2 an inch, the lamp would work great for you. All of the flush or grommet mounted 4 inch trailer lights we offer require a 4-1/2 inch hole.
    view full answer...
    Image 1 for
  • Availability of a Optronics GLOLight LED Stop/Turn/Tail Light
    Sounds like you are looking for the Optronics GLOLight LED Stop/Turn/Tail Light # STL101RFMB which we do carry. I attached a review video for you to check out as well.
    view full answer...
  • What are the Dimensions of the Different Steps on the Back of Optronics Trailer GloLight STL101RFMB
    I went out to the warehouse and pulled Optronics trailer light # STL101RFMB to measure it for you. That bottom tier is actually closer to 4-7/16 inches (4.44) and it is 3/16 inches tall. The next one up is 3.95 inches in diameter, which might as well be 4 inches, and it is 3/16 inches tall. The last tier is 3.79 inches (3-3/4) in diameter and 3/8 inches tall. The plug at the top is 1 inch wide, 1/2 inch front to back, and 7/16 inches tall.
    view full answer...
    Image 1 for
  • Availability of a Flush Mounted 2-1/2 inch Diameter GLO Light Led Trailer Light
    The Optronics GloLight # MCL157RB that you referenced is designed to be recess mounted with the Recess Flange # A57GB. While it wouldn't quite be as flush mounted as the Optronics GLOLight LED Stop/Turn/Tail Light # STL101RFMB that you also have it would look pretty good on your trailer. For a very similar 2-1/2 inch LED light that is designed to be flush mounted check out the # MC57RB. For a flush mounted grommet you would want part # A55GB.
    view full answer...

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Info for this part was:

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

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