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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
Our Price: $31.01
You Save: 22%
Trailer Lights
Shipping Weight: 0.39 lbs
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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. 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 STL101RFMB can be ordered online at or call 1-800-940-8924 for expert service.
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Optronics Trailer Lights - STL101RFMB

  • Tail Lights
  • Round
  • LED Light
  • Red
  • 5-1/2 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

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Customer Satisfaction Score:

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   (1299 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.


Good quality light at a great price, very helpful staff when ordering


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!


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.


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.


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.



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


Love your products , this my third orde r!


I like the lites


nice product, good price, fast delivery,thumbs up







etrailer does provide a wide range of products with different price points so the customer has a lot of choices to make the decision that is right for her\him. You also offer good online support documentation and your technical staff is also very helpful in helping the customer make the right choices.
Unfortunately, you left me with a very bad experience. I ordered a full set of lighting & wiring to redo our quad trailer from the 7-pin plug to reverse lights. A large order. I erroneously ordered 2 reverse\turn single lights, which is on me, so I expected a restocking fee (a little excessive, but that's the inventory business). I had to return the 2 wrong lights and order the correct one. I returned both lights, but etrailer said they only received one, which I was 99% sure I returned both. You had no interest or showed any flexibility considering maybe I was correct. This is a one year review you have asked me to submit and the light you claimed I did not return, still has not shown up in my garage. I liked dealing with you on numerous occasions, but I have taken my business elsewhere. That was a sad experience.


I have had these installed for a year now on my 14ft utility trailer. I love these lights! They are strong, durable, bright, and look so super cool at night! Most recently, last month, I trailered 1500 miles and through the mountains in West Virginia. They held up through curves and bumps and rainstorms and even dime-sized hail! I would recommend these to anyone who needs this style of light! I wish I had brackets enough to put two on each side... just so it would look extra bada**!


The Igor worked great. I had a heck of a time trying to order lights for the trailer - either not getting the ones I intended getting or mismatched lights. But you came through like me a champ. Thanks.


Was not happy with the packaging. GloLights were not packaged, just placed loose in the box with other items. One piece of brown paper in the box for a void filler. Lights were scratched up when arrived.


Excellent replacement. Looks like original ones and simple to install. Tried to replace bulbs in old one's they would not hold contact and bulbs were almost as much as the replacement I saved time and anguish by just replacing the old ones


Excellent hi vis lighting for my traile r.


got these because they came up as replacement for the number of the old light that came out, these are ok but not really bright and I would have gone with a brighter unit even if I had to cut the metal out a bit to make it fit


Small led, nice light

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • 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...
  • 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...
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  • 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
  • Recommendation for Round 5-1/2 Inch Tail Light Replacement
    The best option to replace your round 5-1/2 inch tail lights are surface-mounted LEDs because they are going to be the brightest, last the longest, and be the easiest lights to mount. There are two options that are similar except for the lenses, though both give you stop, turn, tail and back-up functions. The LED Trailer Tail Light # 328-003-6019R only has a red lens, but uses white LEDs for the back-up while the Fusion LED Combination Tail Light # STL201XRFHXB also has white LEDs but...
    view full answer...
  • 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...
    Image 1 for
  • Which Pigtail Is Correct For The Optronics GloLight Taillight STL101RFMB?
    The Weathertight connection on the back of the GloLight LED Trailer Tail Light # STL101RFMB is a newer design from Optronics, so the Three-Wire Straight Pigtail # AL45PWTB is an adapter for the older 3 prong design that is still pretty commonly used on older lights and other manufacturers (see part # A45PB). With that said, as you do not have a need for this adapter, you will indeed need the 3-Wire Pigtail - Weathertight Plug # A45PMB.
    view full answer...
  • 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...

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 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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