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LED Clearance or Side Marker Light with Reflector - Submersible - 2 Diodes - Rectangle - Red Lens

LED Clearance or Side Marker Light with Reflector - Submersible - 2 Diodes - Rectangle - Red Lens

Item # MCL40RB
Our Price: $10.84
Trailer Lights
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Shipping Weight: 0.09 lbs
In Stock
MCL40RB - Red Optronics Clearance Lights
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4" x 1-1/2". Waterproof, LED trailer light serves as either a side marker light or a clearance light. Built-in reflex reflector. Durable polycarbonate lens and housing. Surface mount - hardware not included. 2-Wire pigtal. P2 rated. Great Prices for the best trailer lights from Optronics. LED Clearance or Side Marker Light with Reflector - Submersible - 2 Diodes - Rectangle - Red Lens part number MCL40RB can be ordered online at or call 1-800-496-5010 for expert service.
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  • Reviews (43)
  • Q & A (0)
  • Videos (1)
  • Photos
  • Why etrailer?

Optronics Trailer Lights - MCL40RB

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

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


  • Rectangular LED trailer light serves as either a side marker light or a clearance light
  • Built-in reflex reflector removes the need for a separate reflector
  • 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 polycarbonate lens and housing
  • Red lens over white LED
  • Surface mount - hardware not included
  • 2-Wire pigtail - includes power lead and ground wire
  • P2 rated


  • Light dimensions: 4" long x 1-1/2" tall x 15/16" thick
  • Distance between mounting holes (center on center): 3"
  • Diodes: 2
  • Power draw at 12.8 volts: 0.040 amps
  • Lifetime warranty on LEDs

Optronics Clearance or Side Marker Light with Reflex Reflector - Submersible - Rectangle - 2 Diodes - Red Lens Diagram

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 internal components.

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.

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.

MCL40RB Optronics LED Clearance or Side Marker Light with Reflex Reflector - Rectangle - Red Lens

California residents: click here

Video of LED Clearance or Side Marker Light with Reflector - Submersible - 2 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 Trailer Lights - Clearance Lights - MCL40RB Review

Speaker 1: Today we're taking a look at the Optronics LED Clear. It's your side marker trailer light. This trailer light replaces or adds a clearance or side marker light to trailer. It contains a total of two LEDs or diodes, and LEDs make great replacements for incandescent lights. They last longer, they burn brighter, they're much more efficient. With LEDs, you don't have to worry about replacing bulbs or worry about brittle filaments.

And Optronics puts a lifetime warranty on their LEDs. The unit does feature a snap on, replaceable red lens, so that way if it's ever damaged you don't have to buy a whole new unit. You just need to buy a replaceable lens.And this lens has the built in reflects, which eliminates the need for a separate reflector. It's made from a durable acrylic construction and then the base is white in color and made from ABS plastic. It is a surface mount installation, so it mounts directly on the surface of your trailer, mounting hardware not included.

These mount holes are separated on center by three inches. It's a two wire design. White wire for ground, black wire for power. The PT rated light is SAE, and Department of Transportation compliant. Taking a look at a few measurements real quick and then we'll hook it up to power.Overall length of the unit, edge to edge, see there, that's about four inches.

Overall width is about an inch and a half. Again, mount holes are separated on center by three inches, and the overall thickness or depth is about one inch. It's 15 16ths of an inch. We're going to go and hook it up to power. And again, we'll be able to turn off our overhead lights so you can see it in a lower light setting.So you can see here the light sends out a very bright consistent signal.

Two diodes, so the multi diode design really helps optimize the overall light output, and when it comes to the power draw at 12.8 volts, we're looking at 0.040 amps. That's going to do it for today's look at the Optronics LED Clearance, or Side Marker Trailer Light.

Customer Satisfaction Score:

Customer Reviews

LED Clearance or Side Marker Light with Reflector - Submersible - 2 Diodes - Rectangle - Red Lens - MCL40RB

Average Customer Rating:  4.7 out of 5 stars   (43 Customer Reviews)

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


Clear picture and description of item. Was replacing broken marker light so had to be exact. User friendly site for ordering. Quick service. Our "Li'l Hilton" is whole again.


I was amazed to find the exact clearance light for a 2015 travel trailer thanks for stocking these,they shipped out day after I ordered them. Thanks again.


Excellent customer service! Cannot say enough about the personal service and quick response. Just an absolutely stellar customer service experience! Thank you E-Trailer!!!


Great product and great match replaceme nt!


Thank You for the product. However this trial run was less than satisfactory.
Other companies delivered the same product in original packaging that contained the light, a weather tight gasket, And fastening screws. All We received was the light. In a envelope. You asked.

Thank you for your review. The hardware is not included but these are already waterproof so no weather tight gasket is required.
-- Etrailer Expert Sierra K - 06/03/2021


narrower than I expected but good quali ty


The look very rugged and quite easy to install.


This light was what was advertised and it works great. The service was very good, but the only thing I can say negative about this company is that I did not receive an email when the item was shipped with a tracking number. Other than that, everything was great.


I bought 5 of these market lights to replace the market lights in the rear of my 1999 Winnebago Rialta. The size was very close and I opted for the low energy use LED version. After they were all installed, one of the LED lights did not work. Hence I took one star off. Make sure you test them before you go through the trouble of installing them. Since I just wanted to get the job done before the expected rain, I modified one of the lights and reused the bulb and holder from the original light. I did have to make some slight modifications to make the wiring work and the install was a bit tricky since there is no excess wiring protruding from the body of the Rialta. I was able to solder new wires on and make the connection. After one year they are all working fine and there is no moisture intrusion.


Not an exact replacement...mine was 3 led..but sufficient. Arrived quickly!


Lens broke while trying to get it off.

I will have our customer service team reach out to you.
-- Etrailer Expert Jenny N - 01/19/2022


Perfect replacement for a factory marker light that failed. Way easier to replace at home then wait for factory service, parts order etc at the dealer.


A little surprised to see them all loose (no individual packaging) in box.


Perfect fit for my Haulmark Enclosed trailer jack


Just what the boss wanted replacing on a 1985 5th wheel trailer.


Great product. Fits my RV perfectly. Took one star off for slow shipping.


As before, good service , good product


Was hoping these would replace the existing for the proper fit, and they did! Thank you etrailer, another wonderful job.


Product was a direct replacement (ok, it may have been a updated version but same form, fit and function) and works like a charm. Shipping was good and on time. If I need more I know where I'll be ordering from. ;)


Excellent service, easy to find items for my rig. Speedy shipping. Thank you.


Perfect upgrade for my Haulmark enclosed car trailer


Great customer service , LED lights are a great , inexpensive upgrade. Well worth it !


Quick easy fix for burned out rear clearance light on our TT.

Easy ordering and quick delivery.


Exactly what I needed and delivered qui ckly!


Very Quick and efficient. Pricing was best on the market.

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • Is the MCL40RB a 2 Diode LED Light?
    The LED Clearance of Side Marker Light # MCL40RB is the same light as the one you've got pictured. This light is also a 4" x 1-1/2" light with 2 diodes and will be an acceptable replacement for the light shown in your picture. The mounting holes on the # MCL40RB are 3" apart, center on center.
    view full answer...
    Image 1 for
  • Red Clearance Lights For A 2021 Northwood Nash Travel Trailer
    We have what you are looking for. Depending on the style you currently have you have some choices. Just depends on what size and bulb type you need. We have the Optronics LED Trailer Clearance or Side Marker Light w/ Reflector - 6 Diodes - Rectangle - Red Lens # MCL44RB1 with a single wire. Or the Optronics Trailer Clearance or Side Marker Light w/ Reflex Reflector - Incandescent - Red Lens # MC44RB that is a double wire hook up. Or we have the LED Clearance or Side Marker Light with...
    view full answer...
  • Replacement Lenses for MCL40/44 Series Optronics Lights in Red and Amber
    The Replacement Red Lens for MC44 Series and BA44 Series Trailer Lights # A44RB is the 4 inch by 1-1/2 inch replacement for the # MCL40RB light. If you need the amber replacement lens that is # A44AB. These lenses will fit the MCK40/44 series lights from Optronics and I've confirmed this fit on the MCL40AB light you referenced.
    view full answer...
  • How To Remove Optronics LED Clearance or Side Marker Light # MCL40RB For Replacment
    To remove the Lens # A44RB from the LED Clearance or Side Marker Light # MCL40RB you will need to place the tip of a flat head screwdriver between the lens and light assembly(see image). I recommend starting near the corners to reduce the risk of damaging the lens. Once you have the lens removed you will see the screws used to mount the lights. As this hardware is provided by the trailer manufacturer I cannot tell you exactly what it will have but a Philips head button screw is most commonly...
    view full answer...

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Info for this part was:

Employee Leah B
Edited by:
Leah B
Employee Cole B
Installed by:
Cole B
Employee Wilson B
Updated by:
Wilson B
Employee Brian T
Updated by:
Brian T
Employee Anna W
Written by:
Anna W

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