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Miro-Flex Thinline LED Trailer Clearance or Side Marker Light - Sumbersible - 4 Diodes - Red Lens

Miro-Flex Thinline LED Trailer Clearance or Side Marker Light - Sumbersible - 4 Diodes - Red Lens

Item # MCL63RB
Our Price: $9.94
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Trailer Lights
Shipping Weight: 0.09 lbs
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Trailer Lights MCL63RB - Surface Mount - Optronics
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4-1/16" x 1-1/4". Waterproof, LED trailer light serves as either a side marker light or clearance light. Miro-flex reflector increases light output. Surface mount with bracket - hardware not included. Accepts 1- or 2-prong plug. P2 rated. Great Prices for the best trailer lights from Optronics. Miro-Flex Thinline LED Trailer Clearance or Side Marker Light - Sumbersible - 4 Diodes - Red Lens part number MCL63RB can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (303)
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Optronics Trailer Lights - MCL63RB

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

4-1/16" x 1-1/4". Waterproof, LED trailer light serves as either a side marker light or clearance light. Miro-flex reflector increases light output. Surface mount with bracket - hardware not included. Accepts 1- or 2-prong plug. P2 rated.


  • LED trailer light functions as a clearance light or side marker light when properly mounted
  • Thinline Series has a low profile so that light can fit in tight spaces
  • Sonically sealed, waterproof housing and lens unit is submersible
  • Miro-flex faceted reflector provides increased light output with a contemporary appearance
  • 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 housing and lens
  • Red lens over white LEDs
  • Compatible with 12V DC systems
  • Surface mount on trailer with bracket (A65B - sold separately)
  • Accepts industry standard 1-prong or 2-prong plug
  • DOT compliant
  • P2 rated


  • Dimensions: 4-1/16" long x 1-1/4" tall x 1-1/8" thick
  • Distance between mounting holes (center on center): 3"
  • Diodes: 4
  • Power draw at 12.8V: 0.051 amps
  • Lifetime warranty on LEDs

Optronics MCL63 Series Miro-Flex Red LED Marker Clearance Light Dimensions

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.

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.

MCL63RB Optronics Miro-Flex Thinline LED Clearance or Side Marker Trailer Light - Sumbersible - 4 Diodes - Rectangle - Red Lens - P2 Rated

Alternate part number: MCL-63RB

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Miro-Flex Thinline LED Trailer Clearance or Side Marker Light - Sumbersible - 4 Diodes - Red Lens - MCL63RB

Average Customer Rating:  4.8 out of 5 stars   (303 Customer Reviews)

4-1/16" x 1-1/4". Waterproof, LED trailer light serves as either a side marker light or clearance light. Miro-flex reflector increases light output. Surface mount with bracket - hardware not included. Accepts 1- or 2-prong plug. P2 rated.


The light is of excellent quality and was easy to install. Customer service and receipt of the product was exceptional. I would Highly recommend etrailer.



The light has continued to perform as advertised. It was easy to install and the light is brilliant.


One of the original marker lights on my trailer was partially burned out. I purchased two of these, one to replace the bad one, and one to carry for a spare. It was an exact replacement and fit perfectly.


Took great and were a perfect fit. Replaced all the marker lights on my 1998 Alaskan with these. Don’t forget the mounting bracket.


Excellent customer service and perfect fit product performed to specifications
Would recommend and use again


Exact replacement for OEM lights on my trailer. Installment snap-in very easy and lights performing as specified. Very happy with lights after 6 months oHu
f operation. Would recommend.


I’m really glad I chose this product quick delivery easy installation definitely worth the money very bright


I almost gave this a 5 star because it is well built, easy to install and works great, but the design has flaw, at least for my application. It's so tall or thick that it is constantly getting kick off the fixture when I'm stepping up or down on the trailer. The rear side marker light, which is not near a step, keeps getting knocked off by presumably by rocks or other road debris.


These LED Miro-Flex lights are a proper upgrade. They really look SHARP! My truck is grey, my trailer is grey, I replaced all the marker and tail lights on my 09' 7x14 tandem HaulMark with these and now have better visibility during the day. After a year i still am very happy. I noticed the lights are directional, so if your at the side during the day you have to look at them straight on to see if they are working but thats really not an issue. You have markers on all four sides just for that reason as well as reflectors. I have actually gotten unsolicited compliments from other contractors on the trailer since i got these.


I replaced all of the lights on my trailer with LED lights. I wanted to be very visible at night for safety reasons, etrailer helped me out with this. I put a dab of die-electric grease on the contacts as I did this. My trailer is extremely visible at night, now.


Good service


This was a Perfect replacement for the marker light on the left side of my Trailer!
Easy to install and simple to wire!



These new lights [LED] continue to work flawlessly and the brighter light is quite noticeable. They were easy to install and have not been removed yet! After a Year they are as bright as they were the day I installed them!!


Perfect replacement for my 2004 OEM lights. I converted the in closed trailer to LED. It’s been around a year and everything is just fine. Remember, quality first price second. [base plate A65PB, LED yellow AL91AB, LED red AL91RB]


Killer lights, Killer price.


Exact replacement, works perfect!


It appears that this will be an excellent light after I receive all of the additional parts to actually install the lights. I ordered 14 of these lights only to find out after receipt they require the mounting brackets and plug in. Thus delaying the project and incurring freight cost because the order is under the threshold for free shipping. I upgraded the freight to ground only to find out that etrailer didn't have the part of my additional parts in stock. Jury still out on this project.


THIS is my choice for enclosed trailer clearance lamps . Nice ass’y when used with corresponding mounting base . Same for the RED .


Great customer service & the items shipped fast and were exactly what I ordered.
Will definitely order from Etrailer again... Lights work great... The only thing is that the description does not state the light base must be ordered separately..


They are exactly what I needed.


Great product at a great price. My trailer looks amazing at night all lit up.



Excellent product saved me buying new 5th wheel hitch, very good service too


Great lights at a great price. No fault of etrailer, but lights spent an extra 4 days in the usps.


Should actually come with mounting base.


The lights work perfectly. The customer service is the best. Have them on my boat trailer all around.


Looks great, nice and bright, fits perfectly in the two-pin sockets I already had.

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • Replacement Clearance Light for Boat Trailer
    In order to select the correct clearance light for your boat trailer, you would need to measure the light and know how it mounts. For example, the Optronics Clearance Light # MCL63RB is 4-1/16" long x 1-1/4" wide x 1-1/8" deep and is a surface mount LED light which mounts on industry standard 3" centers. I've added a link to each of our clearance lights for you to take a look at.
    view full answer...
  • Does Optronics Side Marker Light # MCL63RB have to be Mounted a Specific Way
    Lights that have to be mounted in a specific orientation will have TOP printed on them somewhere which I do not see on light # MCL63RB. The lens is designed to direct the light straight outward so that is likely why it is harder to see them if they are mounted high and you are close to the trailer. A lens design like that found on # MCL75RB would be a little easier to see at steeper angles. I have included a help article on trailer lighting requirements for you.
    view full answer...
  • Replacement Side Marker Light with 3 Spacing of Mounting Holes and 4 Long x 1-1/4 Tall
    You can use the Miro-Flex ThinLine LED Trailer Clearance or Side Marker Light - Sumbersible - 4 Diodes - Red Lens # MCL63RB which is 4" long and 1-1/4" tall with 3" spacing between the mounting holes. I've also linked our entire selection of lights that fall within those dimensions in case you're looking for something different.
    view full answer...
    Image 1 for
  • Trailer Marker Light With 2-3/4 Inch Mounting Holes
    We do, as there is a single trailer clearance light that has the 2-3/4" on center mounting holes. The part number you need is the following: - Mini LED Clearance or Side Marker Trailer Light # MCL85AB This is an amber lens, which is the only color available.
    view full answer...
  • Replacement Side Marker Lights with Mounting Holes 3" Apart for Horse Trailer
    I recommend using the Optronics Trailer Clearance or Side Marker Light w/ Reflex Reflector - Incandescent - Red Lens # MC44RB, which has mounting holes 3" apart like your existing lights and will be 4" long x 1-1/2" wide. These are an incandescent light, so they'll be a good like for like replacement of your existing lights. If you're instead looking for an LED light, you can use the # MCL63RB you were looking at, which also have mounting holes 3" apart. I've also linked our entire selection...
    view full answer...
    Image 1 for Image 2 for Image 3 for
  • Chrome Base Recommendation for the Optronics Clearance Light # MCL63AB
    Yes, the Chrome Bracket and Single Wire Plug # A67CB that you referenced is the correct base for the # MCL63AB and # MCL63RB that you plan on getting. The reason this bracket uses a single wire is because the light will ground through the mounting hardware. If you needed to run a second ground wire to the assembly you would only need to run the stripped ground wire around the mounting screw that attaches to the side of the base with the ground strap. See picture I attached to see which...
    view full answer...
    Image 1 for
  • LED Version of the Bargman 99 Incandescent Clearance Light # 3499001
    The closest thing we offer to Bargman 99 Incandescent Clearance Light # 3499001 that you referenced that is an LED would be the Optronics Trailer Lights # MCL63RB. Dimensionally these lights are virtually identical. I attached a review video for this light. For an install bracket you would want the part # A65PB.
    view full answer...
  • Mounting Bracket Recommend for Running Power and Ground Individually to Thin Line Clearance Lights
    To use the # MCL63RB and run the ground and power wires directly to it you would need the part # A68P as well. This would allow you to wire up the light without having to ground the light through the mounting hardware. For a bracket you would then want the part # A65B.
    view full answer...
  • Availability of Red Miro-Flex LED Clearance Lights
    Although they aren't an exact match on size and design compared to the # OPT78FR, we do have a couple options for red Miro-Flex side marker lights. You can choose from one of the following: -Miro-Flex Mini LED Clearance or Side Marker Light - Submersible - 3 Diodes - Rectangle - Red Lens # AL191RB -Miro-Flex Thinline LED Trailer Clearance or Side Marker Light - Sumbersible - 4 Diodes - Red Lens # MCL63RB The # AL191RB measures 2-1/2" long x 1-3/16" tall x 1" thick and can have a recessed...
    view full answer...

Do you have a question about this Trailer Light?

Info for this part was:

Employee Tyler C
Written by:
Tyler C
Employee Patrick B
Video Edited:
Patrick B
Employee Jacob T
Video Edited:
Jacob T
Employee Michael H
Expert Research:
Michael H
Employee Laura H
Updated by:
Laura H
Employee Brian T
Updated by:
Brian T

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