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GloLight LED Trailer Clearance or Side Marker Light - Submersible - 6 Diodes - Round - Red Lens

GloLight LED Trailer Clearance or Side Marker Light - Submersible - 6 Diodes - Round - Red Lens

Item # MCL155RB
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Trailer Lights MCL155RB - Rear Clearance,Side Marker - Optronics
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2" Diameter. Waterproof, LED trailer light serves as a side marker or a clearance light. GloLight lens creates a solid panel of light. Recessed mount with grommet (sold separately). Accepts industry-standard 2-prong plug. P2 rated. Lowest Prices for the best trailer lights from Optronics. GloLight LED Trailer Clearance or Side Marker Light - Submersible - 6 Diodes - Round - Red Lens part number MCL155RB can be ordered online at or call 800-298-1624 for expert service.
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  • Reviews (1030)
  • Q & A (0)
  • Videos (3)
  • Photos
  • Why etrailer?

Optronics Trailer Lights - MCL155RB

  • Clearance Lights
  • Round
  • LED Light
  • Red
  • 2 Inch Diameter
  • Recessed Mount
  • Rear Clearance
  • Side Marker
  • Submersible Lights
  • Optronics

2" Diameter. Waterproof, LED trailer light serves as a side marker or a clearance light. GloLight lens creates a solid panel of light. Recessed mount with grommet (sold separately). Accepts industry-standard 2-prong plug. P2 rated.


  • Round trailer light can function as both a clearance light and a side marker light when properly mounted
  • GloLight lens creates a solid light pattern with a smooth appearance
  • Sonically sealed, waterproof housing and lens unit is submersible
  • Durable surface-mount technology (SMT) construction of LED circuit board
    • Better withstands shock, moisture 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
  • Durable polycarbonate housing and acrylic lens
  • Recessed mount with grommet (A54GB - sold separately)
  • Accepts industry-standard 2-prong plug (A46PB or A49PB - sold separately)
  • DOT compliant
    • Meets FMVSS 108 and CMVSS requirements for automotive lighting
  • P2 rated


  • Quantity: 1 clearance/marker light
  • Diodes: 6
  • Dimensions: 2" diameter x 3/4" deep
    • Light diameter: 2"
  • Power draw at 12.8 volts: 0.063 amps
  • Lifetime warranty on LEDs

Optronics MCL155RB GloLight RED LED Side Marker and Clearance Light Dimensional Diagram

Innovative GloLight Design

Optronics Glo light side marker or clearance light lit

This red LED light serves as either a side marker light or a clearance light. 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.

P2-Rated Lights

Diagram of light spread for P2 rated light

A P2-rated light produces a 45-degree angle of light to either side of its centerline for a total of 90 degrees of coverage. This beam pattern can be seen straight on, but it cannot be seen clearly from the side. So this type of light can be used as either a side marker light or a clearance light, but it cannot function as both. If you need both functions, then you must install 2 separate light on your trailer - one as a front or rear clearance light and one as a side marker light.

Simple Installation

Back of Optronics Glow light showing standard 2-prong plug mount

This GloLight has a standard 2-prong plug as pictured above. A 2-prong pigtail with mating plug (A46PB or A49PB - sold separately) is required to connect this light to your vehicle or trailer. An optional mounting bracket is also available (BK5557GB - 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 (A54GB - sold separately). These lights will extend into the mounting surface and require that a hole be cut into your trailer.

MCL155RB Optronics Glow Light LED Trailer Clearance or Side Marker Light - Recessed Mount - Submersible - 6 Diodes - Round - Red Lens

California residents: click here

Video of GloLight LED Trailer Clearance or Side Marker Light - Submersible - 6 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 Clearance or Side Marker Light - Submersible - 6 Diodes - Round - Red Lens - MCL155RB

Average Customer Rating:  4.8 out of 5 stars   (1029 Customer Reviews)

2" Diameter. Waterproof, LED trailer light serves as a side marker or a clearance light. GloLight lens creates a solid panel of light. Recessed mount with grommet (sold separately). Accepts industry-standard 2-prong plug. P2 rated.

- MCL155RB

Easy plug and play installation. Hopefully won't have to change again as long as I own the trailer.

- MCL155RB

Really does stand out compared to other LED markers

- MCL155RB

etrailer has outstanding service as alw ays!

- MCL155RB

Great service like always from etrailer. Lights were exactly as described on the site. I haven't put them on yet but will be going on a Eby horse trailer in the spring when the snow melts.

- MCL155RB

Fast service great parts

- MCL155RB

Installation was easy and straight forward. Lights are bright, durable and modern.

- MCL155RB

Item was of good quility, and set my trailer apart from others.

- MCL155RB

Great upgrade and much brighter than the original incandescent bulbs.

- MCL155RB

- MCL155RB

Super fast shipping. Haven’t installed yet.

- MCL155RB

- MCL155RB

Light look great. Very bright

- MCL155RB


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!

Show More Reviews

Ask the Experts about this Optronics Trailer Lights

  • Availability of a 2 Inch Diameter LED Trailer Light
    We currently don't stock a 2 inch that is 11/16 inch deep. The closest we have are two and a half inch and 11/16 inch deep LED red lights: # MCL59RB # MCL57RB Another very close option would be Optronics GloLight LED # MCL155RB. It's 2 inch diameter and 3/4 inch deep. You may need # A46PB two wire pigtail for sealed trailer clearance, side marker lights.
    view full answer...
  • Recommended Clearance Lights for Vintage Trailer
    One of the prongs on the back of the clearance lights you referenced is for the ground wire which you will tap to a clean, metal surface. The other wire will be spliced into your trailer wiring. I recommend using a plug like the Optronics Two Wire Pigtail for Sealed Trailer Clearance Lights # A46PB. Check out the video review for this part that I have included at right.
    view full answer...
  • Outside Diameter of 2 Inch Round Grommet
    The outside diameter of the 2" Round Grommet # A54GB you referenced is 2-3/4". This grommet is used with 2" round lights such as the GloLight LED # MCL155RB (Red) or GloLight LED # MCL155AB (Amber). You will also need a 2-wire pigtail to complete the installation of these lights; either # A46PB for a 6" lead or # A49PB for a 10" lead. I have added links to video reviews of these parts for you to check out.
    view full answer...
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Info for this part was:

Employee Leah B
Updated by:
Leah B
Employee Wilson B
Updated by:
Wilson B
Employee Brian T
Updated by:
Brian T
Employee Tricia G
Written by:
Tricia G
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Hayden R
Installed by:
Hayden R
Employee Brent H
Installed by:
Brent H

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