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Optronics LED Trailer Clearance or Side Marker Light w/ Reflector - 6 Diodes - Rectangle - Red Lens

Optronics LED Trailer Clearance or Side Marker Light w/ Reflector - 6 Diodes - Rectangle - Red Lens

Item # MCL44RB1
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Optronics 4L x 1-1/2W Inch Trailer Lights - MCL44RB1
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4" x 1-1/2" Rectangle. Waterproof, LED trailer light serves as either a clearance or side marker light. Built-in reflex reflector. Durable ABS housing. Surface mount to trailer - hardware not included. 1-Wire design. P2 rated. Lowest Prices for the best trailer lights from Optronics. Optronics LED Trailer Clearance or Side Marker Light w/ Reflector - 6 Diodes - Rectangle - Red Lens part number MCL44RB1 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (60)
  • Q & A (9)
  • Videos (2)
  • Photos
  • Why etrailer?

Optronics Trailer Lights - MCL44RB1

  • Clearance Lights
  • Rectangle
  • LED Light
  • Red
  • Surface Mount
  • 4L x 1-1/2W Inch
  • Non-Submersible Lights
  • Optronics
  • Rear Clearance
  • Side Marker

4" x 1-1/2" Rectangle. Waterproof, LED trailer light serves as either a clearance or side marker light. Built-in reflex reflector. Durable ABS housing. Surface mount to trailer - hardware not included. 1-Wire design. P2 rated.


  • Rectangular LED trailer light functions as a clearance light or a side marker when properly mounted
  • Built-in reflex reflector removes the need for a separate reflector
  • 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 ABS housing and acrylic lens
  • Red lens over white LEDs
  • Compatible with 12V DC electrical systems
  • Surface mounts to trailer - hardware not included
  • Single wire design grounds through mounting hardware
  • DOT compliant
  • P2 rated


  • Dimensions: 4" long x 1-1/2" wide x 15/16" thick
  • Distance between mounting holes (center on center): 3"
  • Diodes: 6
  • Power draw at 12.8V: 0.040 amps
  • 1-Year limited warranty

Optronics MCL44 Series LED Marker Clearance Light Dimensions

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.

MCL44RB1 Optronics LED Trailer Clearance or Side Marker Light w/ Reflex Reflector - 6 Diodes - Rectangle - Red Lens - P2 Rated

Alternate part number: MCL-44RB1

California residents: click here

Video of Optronics LED Trailer Clearance or Side Marker Light w/ Reflector - 6 Diodes - Rectangle - Red Lens

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Optronics Rectangular 6 Diode LED Clearance and Side Marker Light Review

Speaker 1: Today, we're going to be taking a look at and also showing you how to install the Optronics Rectangular LED Trailer Clearance Light. This is designed as a side marker light. It also has a reflector built in. The part number is MCL44RB1.Now, here's what your light's going to look like installed. As you can see, it's got a nice clean look to it. The six LEDs are going to give you plenty of brightness.

Even during the daylight, you can really see it shines out well. That's what I like about the LEDs. They seem to give you that really clean, really bright light as compared to the incandescent. Also, these tend to last a whole lot longer. The LEDs, we don't tend to replace nearly as often as we do with the incandescents and it won't draw as much power through your vehicle's lighting system.

The LEDs require a lot less power to get that brightness factor. All in all, it could be a really nice way to change out an old light or upgrade the overall look of your trailer.The light also acts almost as a combination system for you. Of course, it's going to give you your side marker or your clearance light, but with the built-in reflectors, it's going to meet the DOT compliance standards there as well, so there's no need for a separate reflector. It's going to be built right in for you.A couple other things to note to make sure it's going to work for your application. From end to end on our light, it's going to be about four inches.

Height-wise, or from the bottom edge to the top edge, it's about an inch and a half, and it's going to come off the surface of your trailer here to the front about 15/16ths of an inch, so just under an inch. The mounting holes are on three-inch centers. That's going to be pretty typical with these side marker lights. It'll just bolt right up. You won't have to worry about creating new holes and if, for some reason, you we're to bump into the lens here and crack it, that is replaceable and of course, the light is going to be water-resistant.

That way, we won't have to worry about dust and moisture getting inside there, causing us headaches down the road.Whether you've got a busted lens like what we have, maybe the lights burned out, or you just want to upgrade to LEDs, you can see this is going to be a really good solution. It's more rectangular than the traditional oval style. They're going to give you a nice look. To get that installed, you will need to remove your old light. Now, these have eight-point screws in 'em, so a torx bit really doesn't work well in here. What we've found is if you don't have the eight-point or the double square bit, you can use a single square bit. You can see that'll help us get those right out of there. You're likely to have a wire attached there, of course, so we'll turn that and get this one out of the way.As you can see with our wire, we don't have a whole lot of slack here. When you do light replacements, you're going to run into that quite often, so we need to get this extended. We're going to use a heat shrink butt connector, part number DW05744, and we're also going to use a short length of wire here, 16-gauge will be what typical trailer wiring is going to be. You can get that on our website. It's part number 16-1-1. Depending on your application, you may have to open your hole up there. As you can see, ours had a pretty narrow hole, so we're going to kind of expand that so we can get our butt connector to slide though.Then we'll just strip the end of that back, then we get our connectors slid on there. Then we got to get a crimp down. Pull on it and make sure you've got a good connection there. Then we can add our little extension wire. We're not going to need a long piece here. It's not going that far and generally, you're not going to need that much wire to make repairs down the road if you have any kind of issues. Then we're going to use a heat source to shrink that down. When it gets all the way shrank down, it almost looks like the wire magnifies. You see a little clear gel come out of the end there. We just push that on in. That'll give us plenty of slack to work with. Now, we want to strip back the end of this wire. To that, we'll add another one of our butt connectors. You can use regular butt connectors if you want, but I think the heat shrink is going to give you superior corrosion resistance. You won't have to worry about moisture and stuff getting in.Now, we'll get our light here. We're going to pop the cover off of it. There's a little seam here. You just kind of get a screwdriver or a soft piece of plastic material in there. We'll pop that off. That'll give us access to the inside. You'll see our little ground wire here. I'm pulling this back in. I'm going to use that to put one of our screws through. That'll secure the light to the trailer so we can get our ground there. The other one, we're going to strip back and we'll add that to the butt connector. We can shrink this one down the same way. Then we can tuck our excess in there. Get the light lined up. I'm going to secure it on the front side first. Then we'll secure the backside here and you notice I'm putting that ring terminal over the screw. Just be easy with it. You don't want to damage that terminal.Then we can take our lens. You can see the reflectors in there. We'll pop that on. All right. Let's test it out.That's going to complete our look at the Optronics Rectangular LED Trailer Clearance and Side Marker Light, part number MCL44RB1.

Customer Reviews

Optronics LED Trailer Clearance or Side Marker Light w/ Reflector - 6 Diodes - Rectangle - Red Lens - MCL44RB1

Average Customer Rating:  4.9 out of 5 stars   (60 Customer Reviews)

4" x 1-1/2" Rectangle. Waterproof, LED trailer light serves as either a clearance or side marker light. Built-in reflex reflector. Durable ABS housing. Surface mount to trailer - hardware not included. 1-Wire design. P2 rated.

- MCL44RB1

I purchased these LED marker lights for my cargo trailer to replace the original incandescent markers that were failing from corrosion after only a few years. Since these were the same manufacturer, the lenses are exactly the same - now I have a handful of spares! The marker lights were mounted with the same screws, but I did have to re-drill for the wiring as the LED wire exited the base at a different location. Installation was a breeze, and the LED is brighter, and will hopefully last much longer. 348979

- MCL44RB1

Product is great and customer services is absolutely spot on. 732138

- MCL44RB1

Lights arrived on time and were well packaged. Much better quality and illumination than the originals that came with the trailer. 715621

- MCL44RB1

These 1 wire self-grounding lights from Optronics are exactly what I was needed to match up with original lights on my enclosed car trailer. These lights were a breeze to install, the led's are bright and I am very happy with this product and Etrailer !!!! 708437

- MCL44RB1

Looks great, just need to to change the other 8 to match. 700631

- MCL44RB1

Great product and super quick on getting this product 694121

- MCL44RB1

Good service 683408

- MCL44RB1

as advertised 650348

- MCL44RB1

Easy out with old and install new quickly. Simple and decent quality 650001

- MCL44RB1

Nice light it fit the top rail just right for the amount of flat space i had to work with, also the installation holes lined up perfectly with old ones 639441

- MCL44RB1

The red marker lights work great , we just updated our motor home. thanks 637774

- MCL44RB1

Change over from regular lighting system to LED pretty simple. Note, make sure you order the correct wiring system (1 or 2 wire). The 1 wire system can be utilized but will need some adjustments. Front facing markers are so bright you may find it blinding especially when backing up at night. 591505

- MCL44RB1

These lights are great. Very bright and highly reflective lens. Would buy again. 578240

- MCL44RB1

This is an exact replacement for a light on my camper that I lost the lens to. Good quality and fast service. 545962

Still works good.
Terry R - 07/25/2019


- MCL44RB1

Product matched description exactly. Good quality and exactly what I needed. 525320

- MCL44RB1

I purchased lights last year while fixing up my 92 sunline. Installation was easy and lights work great. 502564

- MCL44RB1

Exact replacement bulbs for the clearance lights on my horse trailer, speedy delivery even tho I chose the standard shipping. 491191

- MCL44RB1

Looks great, can't wait to get trailer sandblasted & painted before install. 470012

- MCL44RB1

Exact led replacement for the cheap incandescent lights that came on my diamond cargo enclosed trailer, simple to change and with every penny. Fast shipping and great selection! 453248

- MCL44RB1

Good product and easy to install, only suggestion I would make is to make the grounding wire longer. 451457

- MCL44RB1

Fit perfect. 448990

- MCL44RB1

Excellent fit, works great. Price and quick delivery was awesome. 447117

- MCL44RB1

Works as advertised....... 435986

- MCL44RB1

I purchased these lights to upgrade our trailer; new and LED as well !! Simple to change out. 433710

- MCL44RB1

These items is just what I was needing. Now I don't have to worry about every year when I start checking my trailer to get it road ready, of having to tap the clearance lights and or replace bulbs just to get it road. From the minute I made contact with one of the sales people in customer service of etrailer I immediately felt at ease and confident I was going to be satisfied and get the replacement parts I needed and that being, the LED replacement clearance lights for my trailer. I would surely recommend this company and the service they provide to anyone. I am truly grateful for their assistance and the products they sell. 406260

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Info for this part was:

Video Edited:
Patrick B
Video Edited:
Chris R
Expert Research:
Jameson C
Updated by:
Laura H
Updated by:
Sarah W
Updated by:
Brian T
Installed by:
Cole B
Installed by:
Randy B
Video by:
Zach D

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