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

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

Part Number: MCL36RB
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$6.94
Retail:$13.29
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2-7/8" x 2-1/8" Square. Waterproof, LED trailer light serves as a clearance or side marker light when properly mounted. Built-in reflex reflector. Durable ABS housing. Screw-on lens. Stud mount to trailer. 2-Wire design. P2 rated. Great Prices for the best trailer lights from Optronics. Optronics LED Trailer Clearance or Side Marker Light w/ Reflector - 6 Diodes - Square - Red Lens part number MCL36RB can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Optronics Trailer Lights - MCL36RB

Highlights

  • Brighter, Low-Draw LEDs: Six diodes give strong light with just 0.054 amps at 12.8V.
  • One Light, Two Uses: Works as a clearance or side marker light when properly mounted.
  • Built-In Safety Reflector: Reflex lens adds visibility without needing a separate reflector.
  • Durable, Simple Build: ABS housing with screw-on lens stands up to road use.
  • Straightforward Mounting: Stud mount with 2-wire power and ground makes hookup easy.
  • Sized to Fit Tight Spots: Compact 2-7/8" x 2-1/8" x 15/16" design fits many trailer spots.

Features to know about

Brighter, Longer-Lasting Lighting: 6-Diode LED Power

This light packs six red LEDs behind a clear lens to give off a bright, even glow while drawing just 0.054 amps at 12.8V. The LEDs last up to 50 times longer than old-style incandescent bulbs, so you won’t be dealing with replacement hassles anytime soon. With no fragile filaments to break, it’s a dependable upgrade for anyone who wants strong light with low power use.

Built-In Reflector for Added Visibility

You don’t need a separate reflector when this one already has it integrated into the lens. The built-in reflex reflector helps keep your trailer visible even when the lights are off, meeting visibility and safety needs without extra parts or mounting steps.

Simple, Durable Mounting That Stays Secure

Measuring 2-7/8" wide, 2-1/8" tall, and 15/16" thick, this square light mounts solidly to the trailer with its single stud. The ABS housing and screw-on lens hold up well to daily use and vibration, keeping the light sealed tight and protected. The two-wire design—one power lead and one ground—makes wiring straightforward.

Clear Coverage Where You Need It: P2-Rated Output

The P2 rating means this light covers a 90-degree span—45 degrees to either side of centerline—for steady illumination straight ahead or to the side. Use it as either a clearance or side marker light and count on consistent brightness where it matters most.

Reliable Performance for Everyday Use

Designed for 12V DC systems and backed by a lifetime warranty on the LEDs, this light delivers lasting reliability. It’s a tough, efficient option that gives clear visibility night after night without the fuss of bulb changes or frequent repairs.

Specs

Dimensions

  • Width: 2-7/8"
  • Height: 2-1/8"
  • Thickness: 15/16"

Dimensional diagram of Optronics MCL36RB red LED trailer clearance or side marker light showing width and height measurements.

Electrical

  • Power draw at 12.8V: 0.054 amps
  • Voltage: 12V DC systems

Lighting

  • Diodes: 5
  • Rating: P2 rated

Warranty

  • LEDs: Lifetime warranty

MCL36RB Optronics LED Clearance or Side Marker Trailer Light w/ Reflector - 6 Diodes - Square - Red Lens - P2 Rated

Alternate part number: MCL-36RB





Customer Satisfaction Score:

Ratings & Reviews

4.8

4481 reviews
5 Stars
(3847)
4 Stars
(446)
3 Stars
(83)
2 Stars
(36)
1 Star
(69)
Review sort icon
2-7/8" x 2-1/8" Square. Waterproof, LED trailer light serves as a clearance or side marker light when properly mounted. Built-in reflex reflector. Durable ABS housing. Screw-on lens. Stud mount to trailer. 2-Wire design. P2 rated.

by:

Great box lights. Used for twilights on my kids power wheels keep. Everything was as expected from delivery, quality and description.



by:

Nice lights for the money, easy mounting and are bright. got 2 amber and 2 red for the sides of the trailer.



by:

Worked very well, nice and bright, just make sure the ground wire is attached to clean bare metal.



by:

Good product. Fast shipping



by:

The videos demonstrating the product and installation are extremely helpful and your service is great. This is my second purchase from you and will not be my last. Thanks



by:

Reworking my Pacwest Trailer and these are the original equipment replacement, only new LED. Much brighter, less draw and look sharp. Even bought a couple of extras.



by:

Product seems very good. Wire leads are short but most are. Easy install but a lock-washer or locking nut would be very helpful. Without them light will eventually become loose.



by:

Very fast shipping arrived within a few days. Love the looks of these newer clearance lights.



by:

The LED light is sealed so moisture will not be a problem. Much brighter too.

Michael profile picture

Michael

4/16/2022

The LED lights are a great improvement. So much brighter with no moisture in the light.



by:

I really like these lights. I used them as marker lights on the back of my boat trailer. They were easy to install and after more than a year they are still working great.



by:

I love you trailer marker lights. They were exactly what I needed . And they look really good too ! Nice and bright. I am going to order more light next week. Amber and Red. Thank you etrailer.



by:

Used these to replace factory lights on trailer. Very nice and better than what I had

Lancaster,william,reed profile picture

Lancaster,william,reed

7/1/2020

Still going and no problems after 1 year



by:

Good, Heavy duty product. Great service and shipping from etrailer.com!

Will purchase from them again!



by:

I only installed 1 of the 2 I purchased. But when I did, I spent the night basking in the red glow that it put off. So much brighter than the old bulb style it replaced. Have had no problems with it. Would buy again.

Ghost profile picture

Ghost

10/4/2018

1 year later and I still love it! The LEDs are way better than the old bulb lights they replaced even being a year old.



by:

I'm switching over to LED because my brother has good luck with them, and also because the DOT is cracking down on trailers in my state. Commerical guys are getting pounded with insanely high tickets for even one light out. These LED's have 6 per lamp, so if one fails, I'm told, you are still good. I don't have commericial trailers, but I am suspicious of governments that can't manage their money and look for was to screw over residents. I decided to gradually migrate to these lights on all my trailers.



by:

Stripping down a 16 year old 21 ft. salt water use trailer - from end to end. The folks @ etrailer were very knowledgeable, and helpful in my decision making. From placing the order, to tracking the order, to the way the items were packed for transit. Other distributors could learn from these people; in regards to customer service, following up, both office and warehouse. Unloaded the products last night, nothing short, all quality in regards to their products, with great pricing. The installation videos are a big bonus, and something I'll be taking advantage of, during the restoration. Will follow up with picture, (before and after) when I'm done



by:

Was tired of standard incandescent type marker lights having bulbs shift or burn out and not work. I have a Doolittle trailer and the LEDs are good replacement alternatives at a good price. I bought multiples of amber and red, and barring any difficulty, they should be an even swap out.

E-trailer shipped in a timely manner, pkg. was good, and they provided tracking with UPS. Will definitely use them again for trailer lighting, and would highly recommend this product.



by:

Its been a year and these led lights are the best. Can be seen during sunshine, rain and lit up like a Christmas tree at night. Thank you etrailer for these high quality lights.



by:

I installed these lights when rewiring my trailer about a year ago , haven't had any problems .

Lance M. profile picture

Lance M.

11/8/2017

Trailer gets used twice a month



by:

Excellent delivery time and great price makes for a very satisfied coustomer every time! Perfect replacement for my old side marker lights, only now I won't have to worry about it burning out or rough roads jostling the filament. Exact fit and easy to install. Five minutes per light and done! Bookmark these guys for ALL of your trailer parts.

Ralph M. profile picture

Ralph M.

2/15/2017

Perfect lights, bright and dont have to worry about them being dunked under water when launching my boat!



by:

It's smaller than the one I removed. I also added silicone where the wires came out of the light so that there would be no water inside.



by:

Works great easy to install



by:

After one year of use all LED lights work flawlessly. They were an exact replacement for original. Can't be more pleased with the product and etrailer company!



by:

Well I ordered these lights and they were delivered within a week, I am very impressed with them, easy to hook up, and very bright. I would recommend this product to anyone who needs or wants a good pair of clearance lights.



by:

I like these little lights. I used them as rear marker lights across the back of my trailer. Wiring them up was simple. I just grounded the white wire to the light's mounting stud. Installing them would have been simple if I didn't have to drill through such thick U-channel, but I can hardly blame that on the lights. A year after install, they're still working great.


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See what our Experts say about this Optronics Trailer Lights

  • Not Getting Turn Signal Function When Using LED Bulbs On A Trailer
    LED bulbs have little resistance on their own, so when used with turn signals they can create a hyper flash situation, which is a fast flashing of the bulb. To determine if you will need a load-resistor kit like a LED Light Bulb Load-Resistor Kit # DI34ZR, you will install the bulbs and when the turn signals are activated, if the bulbs hyper flash you will need to install the load-resistor kit. This kit will prevent the turn signals from hyper flashing. You will need one kit for each LED...
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  • Availability of 24V Side Marker Light
    Hey Joe; we don't have anything that matches the size and shape of the # MCL36RB in 24V. We do have the Optronics LED Trailer Clearance or Side Marker Light # MCL66R24B which is designed for 12V/24V systems you could use. Options are pretty limited for 24V since 12V is the standard.
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  • How Do I Convert My Incandescent Trailer Lights to LED Lights
    Yes, you just have to remove the old lights, match the wires and mount the new ones. Please note, that it is usually not a good idea to mix LEDs and incandescent lights, so if you have have side markers or other lights on the trailer, make sure you switch those to LEDs as well. Incandescent lights draw much more amperage than LEDs do, and if they pull that current through the LED fixtures, the LEDs could burn up. We have LED side markers and clearance lights like part # MCL36AB and part...
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  • Replacement Trailer Taillights for Peterson PM147
    The closest light we have to the Peterson PM147 you referenced is the Square LED Trailer Clearance, Side Marker Light with Reflector, Stud Mount, 6 Diode - Red # MCL36RB or the Wesbar Clearance Light-LED-Red with Reflex Lens and White Base # 47-222014. If you want a submersible light, I recommend the Thinline Trailer Clearance or Side Marker Light - LED - Submersible - 3 Diodes - Red # MCL67RB or the Peterson Piranha LED Trailer Clearance Light, 2 Diode - Red # 169R.
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  • Will Non-Submersible Clearance Lights Work on a Boat Trailer?
    The Square LED Trailer Clearance Light, # MCL36RB, is non-submersible, so if it gets submerged in water, the possible damage includes short circuits, cracked lenses and burned out bulbs. This light is not sealed, and does not have a drain hole which lets water out if it does get in, like some submersible lights do.
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  • Amber Trailer Lights Similar to MCL-71RB
    The closest thing we have to the # MCL71RB you referenced in amber would be the Optronics # MCL36AB, which is also available in red as part # MCL36RB. The lamps are a bit smaller than the # MCL71RB at 2-7/8 by 2-1/8 inches. Optronics doesn't offer that lamp in amber as an LED version.
    view full answer...
  • Recommended LED Boat Trailer Light For Center Rear Marker
    The closest light we have to the Peterson PM147 you referenced is the Square LED Trailer Clearance, Side Marker Light with Reflector, Stud Mount, 6 Diode - Red # MCL36RB or the Wesbar Clearance Light-LED-Red with Reflex Lens and White Base # 47-222014. If you want a submersible light, I recommend the Thinline Trailer Clearance or Side Marker Light - LED - Submersible - 3 Diodes - Red # MCL67RB or the Peterson Piranha LED Trailer Clearance Light, 2 Diode - Red # 169R
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  • Replacement Red Lens for MC36RB Trailer Light Part # A36RB
    The correct replacement lens for the Square LED Trailer Clearance, Side Marker Light with Reflector, Stud Mount, 6 Diode part # MCL36RB is the Replacement Red Lens for MC36RB Trailer Lights part # A36RB.
    view full answer...
  • Recommended Red Square LED Trailer Clearance Light
    For your boat trailer, you will just need the Optronics LED Trailer Clearance, SIde Marker Light with Reflector - Red # MCL36RB. This is the exact size and design as the Amber # MCL36AB that you referenced and will mount using the included 5/8 inch stud. This is a very nice, square LED clearance light that measures 2-7/8 inches long, 2-1/8 inches wide and 15/16 inches deep. I have attached a short video demonstration on this product that you can also check out.
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  • Are Mounting Brackets Available for Optronics Mini LED Clearance Lights # MCL95AB and # MCL95RB
    The Optronics Mini Rectangular LED Clearance Lights, # MCL95AB and # MCL95RB, are single stud surface mount lights, so they do not have a grommet or mounting bracket available. They were designed to mount directly to an existing bracket or to the trailer frame. The closest clearance lights that we carry to the dimensions of your current lights are the Optronics Square LED Clearance Light, # MCL36AB and # MCL36RB. These are also single stud surface mount lights, but the larger size should...
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  • Do I Need to Do Anything Special to Convert 1979 Skylark Camper to LED Exterior Lights
    There won't be any conversion needed to go from incandescent lights to LED lights on your camper. You'll simply connect the power wires and connect the light's ground wire and you'll be good to go; you could use something like the Optronics LED Trailer Clearance or Side Marker Light w/ Reflector - 6 Diodes - Square - Red Lens # MCL36RB to replace your old red clearance lights. As long as you're replacing all of the lights on your camper with LED lights you shouldn't experience any issues...
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  • Replacement Lens Recommendation for the Square LED Trailer Clearance, Side Marker Light # MCL36RB
    Yes, the correct replacement lens for the Square LED Trailer Clearance, Side Marker Light # MCL36RB that you referenced is the part # A36RB. I pulled the two products from our warehouse to confirm this.
    view full answer...
  • LED Clearance Light With Black Base Recommendation
    The trailer light with a black base we offer that is closest to the size of the # 47-222014, which measures 2-5/8 x 1-7/8 x 13/16, is the Optronics Square LED Trailer Clearance, Side Marker Light with Reflector, part # MCL36RB. The dimensions for this light are 2-7/8 x 2-1/8 x 15/16.
    view full answer...
  • Availability of Optronics LED Trailer Clearance Lamp # MCL71RB in Amber
    The closest thing we have to the # MCL71RB in amber would be the Optronics # MCL36AB, which is also available in red as part # MCL36RB. The lamps are a bit smaller than the # MCL71RB at 2-7/8 by 2-1/8 inches. Optronics doesn't offer that lamp in amber as an LED version.
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Info for this part was:

Employee Patrick B
Video Edited:
Patrick B
Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Brian T
Updated by:
Brian T

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