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

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

Part Number: MCL40RB
In Stock
$11.00
Trailer 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 etrailer.com or call 1-800-940-8924 for expert service.
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Optronics Trailer Lights - MCL40RB

Highlights

  • Reliable In Any Weather: Sonically sealed, waterproof housing keeps water out for lasting use.
  • Fewer Replacements Needed: LEDs last 50 times longer and draw only 0.040 amps at 12.8 volts.
  • One Light, Two Uses: Works as a clearance or side marker light with built-in reflex reflector.
  • Easy Surface Mount: Flat-mount design installs without cutting holes; hardware not included.
  • Compact Fit: 4" Lx1-1/2" Tx15/16" D with 3" mounting hole spacing fits tight spots.
  • Consistent Visibility: P2 rating provides a 90-degree beam for clear, focused lighting.

Features to know about

Brighter, Longer-Lasting Light for Better Visibility: Efficient 2-Diode LED Design

This rectangular LED clearance or side marker light shines bright while drawing very little power. With just 0.040 amps at 12.8 volts, the pair of long-lasting LEDs provide crisp, even light that’s easy to see day or night. They last up to 50 times longer than incandescent bulbs and don’t have fragile filaments to burn out. That means fewer replacements and a dependable glow every time you tow.

Protection from Water and Weather: Fully Submersible, Sonically Sealed Build

No need to worry about rain, road spray, or boat launches—this light is built to handle it all. The housing and lens are sonically sealed into one waterproof unit that keeps moisture out completely. It’s fully submersible, so even underwater use won’t cause damage or corrosion inside the light. Once installed, it stays sealed tight and reliable trip after trip.

Simplified Mounting: Surface-Mount Design with 2-Wire Pigtail

Installing this light is straightforward thanks to its surface-mount setup. It sits flat against the surface—no hole cutting required—and secures using standard mounting hardware (not included). The center-to-center spacing between mounting holes is 3", making alignment easy on existing setups. Wiring is simple too, with a 2-wire pigtail that includes a power lead and a ground wire.

Optronics LED surface mount trailer light demonstrating flush installation on trailer exterior surface.

Extra Safety and Compliance: Built-In Reflex Reflector and P2 Rating

For added visibility without extra parts, this light includes a built-in reflex reflector that removes the need for a separate reflector plate. Its P2 rating provides a focused beam with a 45° spread to each side of centerline (90° total), ideal for use as a clearance or side marker light. With its red lens over white LEDs and durable polycarbonate housing, it delivers both performance and safety in one compact 4" x 1-1/2" x 15/16" package.

Specs

Dimensions

  • Light dimensions: 4" long x 1-1/2" tall x 15/16" thick
  • Distance between mounting holes (center on center): 3"

Technical diagram of Optronics LED rectangular clearance or side marker light with red lens showing dimensions and mounting hole spacing for 4-inch by 1.5-inch submersible trailer light.

Electrical

  • Power draw at 12.8 volts: 0.040 amps

Lighting

  • Diodes: 2

Warranty

  • Lifetime warranty on LEDs

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





Customer Satisfaction Score:

Ratings & Reviews

4.8

4489 reviews
5 Stars
(3855)
4 Stars
(446)
3 Stars
(83)
2 Stars
(36)
1 Star
(69)
Review sort icon
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.

by:

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



by:

Exact fit for my LivinLite 21RBS! Thank you!



by:

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

Easy ordering and quick delivery.



by:

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



by:

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



by:

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



by:

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.



by:

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.



by:

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.



by:

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



by:

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. ;)



by:

Easy to install and it serves a great purpose making my bike carrier (trailer) more safe.



by:

Perfect fit for my Haulmark Enclosed trailer jack



by:

The clearance light is exactly the light I ordered! I’m more than satisfied!!

Jeff profile picture

Jeff

6/19/2024

The light is a lower rear right side clearance light hat was accidentally knocked off! The replacement from etrailer.com is a perfect match from the old lens . It is still working perfectly a year later!!!



by:

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.

Sierra K. profile picture

Sierra K.

6/3/2021

Thank you for your review. The hardware is not included but these are already waterproof so no weather tight gasket is required.



by:

We didn't receive the entire part originally but called and the complete part came. I'm still waiting to see if weneed to return the light cover or not

Katrina B. profile picture

Katrina B.

4/25/2023

Have you had a chance to see if this is what you needed? We would love to hear your updated feedback.



by:

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.



by:

very helpful



by:

Great service that feels like your dealing with friends instead of a company

Mike L. profile picture
Etrailer Expert

Mike L.

11/20/2025

Thanks Danny! I'm glad we could help!



by:

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.



by:

It was an excellent experience dealing with trailer. Fast service , fast shipping and product was spot on like it always is. Thanks for being a great company to work with



by:

Works perfect. Exact fit. Thanks



by:

Fits perfectly, fast delivery! Great price! Thank you!



by:

Well to be perfectly honest they haven’t been installed yet. My helper was stung in the eyelid by a bee! He had to go to the hospital. I know this doesn’t say anything about the product, but it’s an interesting story. More importantly, these are just lights that I’m sure will work, but the guy on the phone that helped me order them was awesome!

Colleen profile picture

Colleen

12/23/2025

Oh, they were installed shortly after my original response. They’re working fine. No complaints.

Gwendolyn Y. profile picture
Etrailer Expert

Gwendolyn Y.

12/23/2025

@Colleen Thanks for letting us know how the lights are goin for you, Colleen!


by:

Exact replacement for my camper. Easy to order. Shipping was fast. Easy to install. Top quality.


25
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See what our Experts say about this Optronics Trailer Lights

  • Replacement LED Clearance Lights for 2015 Winnebago Minnie Winnie
    Hello Steve; the closest thing we have to your requirements is the LED Clearance or Side Marker Light with Reflector # MCL40RB. This measures 4" long x 1-1/2" tall x 15/16" thick with mounting holes 3" apart on center. This light is sonically sealed so it is waterproof and submersible. The only thing is the wiring on the back. It is toward the center but not dead center coming out of the light. We do have the slightly taller # MCL0032RBB which has the wires coming out of the middle in...
    view full answer...
  • Replacement Marker Light for OPT MCL40RB1
    Hi Chad; the LED Clearance or Side Marker Light with Reflector # MCL40RB is the replacement for your OPT MCL40RB1. This marker light will have the same 4" long x 1-1/2" tall x 15/16" thick dimensions you have now.
    view full answer...
  • Looking for Replacement Clearance Light Lens for Grand Design 420714
    Hey James, that light looks like the # MCL40RB which means for a replacement lens you'd need the part # A44RB.
    view full answer...
  • Recommended Replacement Clearance Light for a TMC Glo Brite 118A
    That's correct, Richard the LED Clearance or Side Marker Light with Reflector # MCL40RB will work great as a replacement for your TMC Glo Brite 118A lights.
    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...
  • Recommended Replacement Light for a Reflect-o-lite 300 SAE-PC-67
    I looked online and I couldn't find the Reflect-o-lite 300 SAE-PC-67 light you are looking for. Since your light is no longer available, I recommend replacing it with the LED Clearance or Side Marker Light with Reflector item # MCL40RB. This LED light is 4" long x 1-1/2" tall x 15/16" thick. It is also available in amber Optronics LED Clearance or Side Marker Light w/ Reflector item # MCL40APB.
    view full answer...
  • How To Remove The Lens On LED Clearance or Side Marker Light # MCL40RB For Installation
    I have included a link to our product video of the similar Amber Clearance Light # MCL40APB below. This has the same design with an amber lens and in the video she demonstrates removing the lens. You can also slide a flat head screw driver between the lens and back of the Light # MCL40RB. Then you will be able to twist the screwdriver to separate the 2 parts. Be sure during installation no Silicone # FAS59FR gets on this part of the backing and it would make it very difficult to remove...
    view full answer...
  • 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...
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  • 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...
  • 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...
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Do you have a question about this Trailer Light?


Info for this part was:

Employee Leah B
Edited by:
Leah B
Employee Jameson C
Expert Research:
Jameson C
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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