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GloLight LED Trailer Tail Light - Stop, Tail, Turn - Submersible - 22 Diodes - Oval - Red Lens

GloLight LED Trailer Tail Light - Stop, Tail, Turn - Submersible - 22 Diodes - Oval - Red Lens

Item # STL178RB
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Trailer Lights STL178RB - Submersible Lights - Optronics
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7-1/2" x 3-5/16". 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. 3-Wire pigtail hardwires into trailer. Lowest Prices for the best trailer lights from Optronics. GloLight LED Trailer Tail Light - Stop, Tail, Turn - Submersible - 22 Diodes - Oval - Red Lens part number STL178RB can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (651)
  • Q & A (9)
  • Videos (3)
  • Photos
  • Why etrailer?

Optronics Trailer Lights - STL178RB

  • Tail Lights
  • Oval
  • LED Light
  • Red
  • Surface Mount
  • 6-1/2L x 2W Inch
  • Optronics
  • Submersible Lights
  • Stop/Turn/Tail

7-1/2" x 3-5/16". 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. 3-Wire pigtail hardwires into trailer.


  • Oval 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
  • Compatible with 12V DC systems
  • Surface mount with built-in flange - hardware not included
    • Light extends 3/4" out from trailer
  • 3-Wire pigtail hardwires into trailer
  • DOT compliant
    • Meets FMVSS 108 and CMVSS requirements for automotive lighting


  • Quantity: 1 combination tail light
  • Overall dimensions: 7-1/2" wide x 3-5/16" tall x 1-1/8" deep
    • Light face dimensions: 6-7/16" wide x 2-5/16" tall x 15/16" deep
  • Diodes: 22
  • Power draw at 12.8 volts:
    • Tail light: 0.59 amps
    • Stop/turn light: 0.569 amps
  • Lifetime warranty on LEDs

Optronics STL178RB GloLight Trailer Tail Light - Stop, Tail, Turn, Oval - Clear Lens 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.

3-Wire Pigtail

Optronics Glow light back view with pigtail

This GloLight has a 3-wire pigtail that connects to your existing trailer wiring. The light face extends out from the flange 3/4". The built-in polycarbonate mounting flange makes it easy to install this light on your trailer. Four screws (not included) are required.

Surface-Mount Light

Surface Mount Trailer Light Installation Diagram

Surface-mount trailer lights install using a flange or bracket with mounting holes. These lights lay flat against the trailer surface and only require a small, often pre-existing hole, for wiring. Mounting hardware is used to secure the light to the trailer.

STL178RB Optronics Glow Light Trailer Combination Tail Light - Stop, Tail, Turn - Submersible - 22 Diodes - 6-1/2" Oval - Red Lens - 3-Wire Pigtail

California residents: click here

Video of GloLight LED Trailer Tail Light - Stop, Tail, Turn - Submersible - 22 Diodes - Oval - 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, Tail, Turn - Submersible - 22 Diodes - Oval - Red Lens - STL178RB

Average Customer Rating:  4.9 out of 5 stars   (651 Customer Reviews)

7-1/2" x 3-5/16". 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. 3-Wire pigtail hardwires into trailer.

- STL178RB

Used the lights on my Harley servi-car, they look pretty good for trailer lights. The LEDs draw a lot less wattage than the lights that were on there. My charging system thanks you. 207285

- STL178RB

Awesome product. Very bright! 605721

- STL178RB

Quite frankly, these are one of the nicest LED taillights I've seen. The glow of the tail-lamp is very modern and it's very bright. These replaced old halogen square tail-lights on a 2005 toyhauler, and it helped freshen up the look of the rear. I had to drill a few holes in the metal plate these attached to, as the three wires must have a direct exit so that they don't get pinched. Initially, these flashed an error code on my 2018 Superduty when I tested the turn-signals, but when I tested them again, the error code went away. Be aware that swapping out halogens for LED's on a trailer may make your tow vehicle throw a turn-signal error. 538942

- STL178RB


- STL178RB

My review is based on receipt of the product...from the time of the online order to receipt of the light was only a couple of days. I have not installed the light yet, but I have not doubt that it will work fine. 697491

- STL178RB

One year later and still bright and functional. Couldn't be happier. 688768

- STL178RB

Good product Fair price Fast shipping Expect nothing less 679056

- STL178RB

The Glolight LED trailer set is the perfect replacement for my tow dolly. It is light weight and much more visible than the standard bulb lamp set the trailer was equipped with. Installation was quick and very easy, I will recommend this to all needing to change theirs out... 654168

- STL178RB

Great lights. I have these in the flush mount style on another trailer. Bought these for another trailer. 637955

- STL178RB

Light installation was very easy, provides a good " BRIGHT LIGHT " over the stock light that came with the trailer. 615062

- STL178RB

I installed these on my overland trailer project and they work perfectly 604677

- STL178RB

Great service. Fast shipping. A+ company to do business with. 593006

- STL178RB

Still going strong. I like the low profile and hopefully they keep working for years to come. 577590

- STL178RB

Product exceeded expectations. Product is super bright and clear and easy to install! 557895

- STL178RB

The tail lights are working great, good product 511451

- STL178RB

Just like advertised 468335

- STL178RB

Parts in Stock and delivered quickly!! 427248

- STL178RB

Looks great veary bright 402038

- STL178RB

Extremely happy with these. These tail lights are super bright and look really cool. 391111

- STL178RB

Wired in easily, fit well, look great. SUPER bright highs. 320560

- STL178RB

Lights are bright and extremely visible to following vehicles - they made my friend with a similar trailer with old style incandescent lights jealous. Etrailer was completely supportive solving a minor technical installation issue. 307312

A year along and they work great. Never concerned about my visibility to those following.
John F - 11/04/2017


- STL178RB

Product looked very good, have not been installed yet. 301367

- STL178RB

great product-perfect for our use 241672

- STL178RB

I ordered new lighting and a spare tire wheel assembly which all came quick and affordable. Thanks etrailer! 192753

- STL178RB

Happy with the purchase etrailer got my parts in quickly. Wasn't really sure if these were the lights I wanted but thanks to the videos etrailer provides makes it easier to choose the right lights. 184324

Show More Reviews

Ask the Experts about this Optronics Trailer Lights

  • How to Wire the GloLight LED Trailer Tail Light Part # STL178RB to a Trailer Connector
    The white wire on the back of the GloLight LED Trailer Tail Light part # STL178RB is for the ground. If you were wiring it to a trailer connector like part # HMC20031 then you would just need to make sure that it is attached to the ground terminal and no additional grounds would be needed. The outer ring of the light that you are referring to is made of plastic just like the body of the light is. The wire leads are around 6" long. I have attached a review video for you.
    view full answer...
  • Wire Color Functions of the GloLight LED Trailer Tail Light # STL178RB
    For the GloLight LED Trailer Tail Light # STL178RB that you referenced the white wire is the ground wire, the red wire is the stop/turn signal wire and the black wire is the taillight/running light circuit.
    view full answer...
  • Optronics 6-1/2 by 2-1/4 Inch Oval LED GloLight, Mounting Bracket, Grommet, and Pigtail
    For Trailer Light Mounting Bracket # BK70BB you would use light # STL111RB with grommet # a70gb and wiring pigtail # A47PB. I have included links to videos of all three of these parts for you. Light # STL178RB would not fit in the mounting bracket since it has its own flange for surface mounting.
    view full answer...
  • Cargo Trailer Lighting That Splices Into Existing Wiring
    If your current lights with a rubber flange are ineffective, the GloLight LED Trailer Tail Light - Stop, Tail, Turn # STL178RB would be a good option as a replacement as long as the dimensions of 7-1/2" wide x 3-5/16" tall x 1-1/8" work for your trailer. The GloLight has a built-in polycarbonate flange which should offer you more stability.
    view full answer...
  • Compatibility of Optronics Glo Light LED and Chrome Accent Trim Ring
    I reached out to my contact at Optronics and was able to confirm that the GloLight LED Trailer Tail Light - Stop, Tail, Turn - Submersible - Oval - Red Lens - Hardwire # STL178RB is compatible with Chrome Accent Ring for STL78 and BUL78 LED Series Trailer Lights # A78CB. They will fit together perfectly.
    view full answer...
  • Replacement Submersible Taillights for Boat Trailer
    We can help you with new taillights for your boat trailer. Please click on the link provided to see all submersible trailer taillights that we offer. You can choose from a variety of shapes, colors, mounting styles and even between standard incandescent bulbs or high-efficiency LED-type lights. Just click on the filters to narrow the products shown to those with the characteristics you prefer. If a light requires an additional part for installation, say a light like Optronics Miro-Flex...
    view full answer...
  • How Long Will Optronics GLOLight LED Stop/Turn/Tail Light # STL178RB Run w/ 7 Amp-Hour Battery
    The Optronics GLOLight LED Stop/Turn/Tail Light, # STL178RB, draws a total of .885 amps, .59 amps for the stop/turn lights and .295 for the taillight. Since you are planning to use a 7 amp-hour sealed lead acid battery to continuously power the light, I am going to estimate that the battery will last approximately 7 to 8 hours. Please keep in mind that the condition of the battery is going to greatly affect the run time of the lights.
    view full answer...
  • Which Diodes of the Optronics Light Illuminate When Brakes/Running Lights Apply STL78RB
    When the running light circuit is activated all diodes of the # STL78RB would activate. When the brake lights or blinkers are applied the outside diodes get brighter. To see the difference check out the review video I attached. The GloLight part # STL178RB is also a great choice. I attached a review video for this light as well for you to see the differences.
    view full answer...
  • Replacement LED Light Recommendations For Trailer
    For a grommet mount red 2 inch clearance light I recommend part # MCL55R1224B. This light uses a 2-wire pigtail, part # A46PB for installation. If you need amber, you would order part # MCL55A1224B. Installed without a grommet, these lights measure 2 inches diameter x 1 inch deep. You can use the 2 inch grommet part # A54GB for this light for a flush mount. It would require a 2-5/16 inch mounting hole. The tail lights I recommend are the Optronics GLOLight LED Stop/Turn/Tail Light,...
    view full answer...

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Info for this part was:

Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
Adam R
Written by:
Tricia G
Video Edited:
Jacob T
Video Edited:
Chris R
Video by:
Kathleen M
Installed by:
Cole B
Installed by:
Andrew S
Updated by:
Brian T

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