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GloLight Thinline LED Trailer Clearance or Side Marker Light - Submersible - Rectangle - Amber Lens

GloLight Thinline LED Trailer Clearance or Side Marker Light - Submersible - Rectangle - Amber Lens

Item # MCL165AB
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Optronics Trailer Lights - MCL165AB
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3-7/8" x 1-1/4" x 7/8". Waterproof, LED trailer light serves as a side marker light or a clearance light. GloLight lens creates a solid panel of light. Wiring and bracket (sold separately) for installation. P2 rated. 10 Diodes. Lowest Prices for the best trailer lights from Optronics. GloLight Thinline LED Trailer Clearance or Side Marker Light - Submersible - Rectangle - Amber Lens part number MCL165AB can be ordered online at etrailer.com or call 800-298-1624 for expert service.
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  • Reviews (120)
  • Q & A (5)
  • Videos (3)
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  • Why etrailer?

Optronics Trailer Lights - MCL165AB

  • Clearance Lights
  • Rectangle
  • LED Light
  • Amber
  • 4L x 1W Inch
  • Surface Mount
  • Rear Clearance
  • Side Marker
  • Submersible Lights
  • Optronics

3-7/8" x 1-1/4" x 7/8". Waterproof, LED trailer light serves as a side marker light or a clearance light. GloLight lens creates a solid panel of light. Wiring and bracket (sold separately) for installation. P2 rated. 10 Diodes.


  • Rectangular trailer light can function as both a clearance light and a side marker light when properly mounted
  • Thinline Series has a low profile so that light can fit in tight spaces
  • 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 and vibration
    • Allows for improved heat distribution
  • 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
  • Amber lens over white LEDs
  • Durable polycarbonate housing and acrylic lens
  • Requires wiring and mounting bracket (sold separately) for installation
  • P2 rated


  • Quantity: 1 clearance/marker light
  • Diodes: 10
  • Dimensions: 3-7/8" long x 1-1/4" tall x 7/8" deep
  • Power draw at 12.8 volts: 0.09 amps
  • Lifetime warranty on LEDs

MCL165 Series Dimensions

Innovative GloLight Design

This amber 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 trailer lighting. LED lights are more efficient, use less power, and last much longer than incandescent lights.

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 lights on your trailer - one as a front or rear clearance light and one as a side marker light.

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.

MCL165AB Optronics Glow Light Thin Line LED Trailer Clearance or Side Marker Light - Submersible - 10 Diodes - Rectangle - Yellow Lens

California residents: click here

Video of GloLight Thinline LED Trailer Clearance or Side Marker Light - Submersible - Rectangle - Amber 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 Thinline LED Trailer Clearance or Side Marker Light - Submersible - Rectangle - Amber Lens - MCL165AB

Average Customer Rating:  4.8 out of 5 stars   (120 Customer Reviews)

3-7/8" x 1-1/4" x 7/8". Waterproof, LED trailer light serves as a side marker light or a clearance light. GloLight lens creates a solid panel of light. Wiring and bracket (sold separately) for installation. P2 rated. 10 Diodes.

- MCL165AB

I spent a lot of time on the internet looking for bright LED clearance lights. I happened upon these GloLight marker lights. I was a little hesitant but have been nothing but pleased. The lights seem to be of sufficient build to keep the water out for years to come. Many LED lights put light out in a straight patter I wanted a light that gave general area lighting and this fits the bill. I drive a lot in the pitch black. It is nice to be able to clearly see where my trailer is at at all times. I would definitely purchase these lights again. I purchased the amber as well as red marker lights. I also purchased the tail markers and the effect was dramatic. Way brighter than the old LEDs I had on it.

- MCL165AB

Trying to swap out my trailer lights to LED, so the draw on the battery is minimal. There are so many variations on the solid color, I had to measure and keep measuring. The solids have 10 Led’s But no such luck is it’s the fender lights that are both amber and red. I guess one company can’t do it all. It would be great to include the mounting plates, especially at this price. And also to sell multi packs of two or three. I only need two amber and two fender dual color, but need seven red. Shipping was sort of slow compared to today’s shipping speeds. Back in the day it would have been speedy. Times they are a changing. Packaging was weak. Each light has a plastic bag, but maybe only two were still in the bag. Maybe some sort of sealed plastic bag would have been smart. I’m guessing these will work fine. I thought we had to be careful of the Positive and Neutral leads for LED lights because we can damage them if they go on backwards. I guess we shall find out. Thanks etrailer for actually having this product with such extensive documentation and videos. Other websites ain’t got nothin on you.

We do have several light bracket options linked at the bottom of each product page for each light. There are different configurations, and colors to suite your specific needs. At this time we do not offer these lights in a multi-pack configuration.
-- Etrailer Expert Rachael H - 06/06/2019

Even though exactly the same size as the original lights, they dont want to clip onto the brackets well and start to slip off. They are slightly larger than the bracket, making it hard to stay in place. None have fallen off yet, but are not seated well. I suggest getting the brackets with each light, but of course that will raise the price of a simple little light and also the labor involved.
Jerome - 06/05/2020

- MCL165AB

Ordered led lights to replace all the lighting on my triaxle trailer. Parts arrived sooner than expected and were a terrific upgrade. I had an issue with one taillight. The item was replaced at no charge, no hassle, no questions asked. Fantastic customer service.

- MCL165AB

I have a 2004 haulmark 8.5x24 and had a difficult time finding these replacement lenses. I was very happy to find them in an LED version. Installation was relatively easy; however, the metal pan head screws used to install the original light bases were too tall for these lenses, and I had to grind them down in order to get these lenses to snap into place. These lenses appear to be made well and I hope they will stand up to ultraviolet light without fading. Very pleased.

After a year, these lights are proving durable. Very pleased.
Kevin B - 06/06/2017

- MCL165AB

We replaced all of the clearance lights on our 3 horse Exiss Trailer with the LED lights last year. Installation was easy and the illumination was much brighter. We are very happy with these lights.

- MCL165AB

Thank you to etrailer for your quick shipping and professional follow up with our Volunteer Fire Department's order. We are updating our concession trailer for a fundraiser event in just a few weeks & your quick turnarounds are helping our deadline for repair. We will definitely purchase from your company again.

- MCL165AB

great service great communication great product

Jeffrey - 03/19/2021

- MCL165AB

I have found that the LEDs burn out much quicker than the incandescent bulbs, but because the LEDs burn out one at a time, I get about the same amount of use. The burn out may be because my alternator puts out nearly 15 volts which exceeds the capacity of the LED. I like the LED light because it is much brighter, even with burned out LEDs.

- MCL165AB

Great light. Mounting bracket should be designed to leave more clearance for the screw heads, used for attaching

- MCL165AB

I like this new style light from Optronics. Can’t wait to see how they look at night. I will say that some don’t seemed to be manufactured to consistent specs, some (very few) are nearly impossible to snap into the brackets with a reasonable amount of force. Others pop in easily, still a good value for the price point.

- MCL165AB

A perfect fit! Provides great light for my trailer step.

- MCL165AB

Ordered new red & yellow led signal markers and a new lid for the trailer. All arrived in 3-4 days and all the old Lights’s swapped out easy. Trailer looks new!

- MCL165AB

Great service and delivery...ordered a few clearance lights for my trailer. Will use this site for parts the local RV place doesn't carry.

- MCL165AB

Great product very quality. Lots of light very impressive click together great. Had bought others from super bright LEDs that were trash compared to these

So far they have been great. Way better quality and brightness than you get from other places.
Cody - 01/14/2019

- MCL165AB

The etrailer products are sold at a fair price . The quality of their products is well above average and I will go back to this online company time and time again

- MCL165AB

Looks good, exactly what I was expecting, can't wait to install them

- MCL165AB

Excellent response. Fast delivery. Product reviews are spot on. Quality products. Can't go wrong with e Trailer.

- MCL165AB

Love these lights, nice and bright and overall nice look to them. Can be seen easily in the bright sun of Northern California.

- MCL165AB

Lights worked well and look great on the trailer

- MCL165AB


- MCL165AB

Very bright

- MCL165AB

Replacement trailer marker lights seem to be good. Don't know for sure as we only use the trailer occasionally.

- MCL165AB

Easy to install and no problems!

- MCL165AB

Products were spot on and service was better than I could ask for. Every order I have placed the service has amazing. They really go out of their way to help in any way possible.

- MCL165AB

Good fit and direct replacement to my old dated bulb fixture

Show More Reviews

Ask the Experts about this Optronics Trailer Lights

  • Mounting Bracket and Harness for GloLight Thinline LED Trailer Clearance Light MCL165AB
    For a black bracket/harness to use with the GloLight Thinline LED Trailer Clearance or Side Marker Light # MCL165AB you'd want the part # A65PB or for a chrome one you'd want the part # A67CB.
    view full answer...
  • Where to Mount GloLight Thinline LED Trailer Clearance Light to Also Function as Side Marker Light
    The GloLight Thinline LED # MCL165AB is a multi-function light in the sense that it can be mounted in different spots to provide certain functions, not in the sense that it will function as a blinking and non-blinking light. It will not operate any differently regardless of where you mount it. The 2 wires that are used on this light are designed for the positive and negative wire that they will be connected to on the vehicle. Under normal circumstances, where you mount this light determines...
    view full answer...
    Image 1 for
  • Wiring Pigtail and Mounting Bracket for Optronics MCL165AB Clearance/Marker Lamp
    It sure will. Optronics confirms that their # A68PB bracket/pigtail kit is compatible with their # MCL165AB GloLight Thinline LED Trailer Clearance/Marker Lamp. I've linked to some product videos for the lamp and bracket kit that you might find helpful.
    view full answer...
  • Troubleshooting Marker Lamps on Trailer
    I'm suspecting a bad ground connection somewhere. Usually when something strange like what you describe, it's the result of a poor ground. How did you wire the side markers? Those would usually be installed inline with the running lamp circuit as it runs down the side of the trailer. Assuming the running lamp circuit runs down one side of the trailer, you'd tap the running lamp into the circuit and for the running lamp on the other side, the easiest way to connect that is to daisy chain...
    view full answer...
  • Lights for a 7 Foot x 10 Foot Cargo Trailer
    It is imperative you check your local laws for lighting requirements in regards to your specific trailer, though I can tell you you no matter what you'll need stop lights, tail lights, turn signals and reflectors. There are other factors, including your trailer's GVWR that you need to take into consideration; I have added a link to a help article on trailer lighting requirements which I highly recommend checking out. That said, a 7' wide x 10' long cargo trailer is almost certain to...
    view full answer...
    Image 1 for

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Info for this part was:

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

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