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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
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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. Lowest 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 etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (151)
  • Q & A (7)
  • Photos
  • Why etrailer?

Optronics Trailer Lights - MCL63RB

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

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 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   (151 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.


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] 659313


LED's much brighter !! 913261

by: 08/12/2020



Plugged right in and worked great. Very bright and visible. 807162


THIS is my choice for enclosed trailer clearance lamps . Nice ass’y when used with corresponding mounting base . Same for the RED . 784815


They are very bright and still look new after 1 year. 777911


Took great and were a perfect fit. Replaced all the marker lights on my 1998 Alaskan with these. Don’t forget the mounting bracket. 766720


Everything looks great. Got here super quick. 722523


Excellent product with the purchase 708000


Upgrading and old set of LEDS that were from an inferior company. These are BRIGHT, clear, and just look great. 686888


I’m really glad I chose this product quick delivery easy installation definitely worth the money very bright 652539


Great service and product! 591749


Great lights at a great price. No fault of etrailer, but lights spent an extra 4 days in the usps. 590817


Excellent part! plugged right in. 562631


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. 559531


Excellent product saved me buying new 5th wheel hitch, very good service too 553921


The lights work perfectly. The customer service is the best. Have them on my boat trailer all around. 527491


No problems with fast shipping 522944


This was a Perfect replacement for the marker light on the left side of my Trailer! Easy to install and simple to wire! 516548

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!!
Francis - 06/03/2019



Shipped fast, great product 478586


Nice and bright 465243


Perfect 400716


Easy install and works great 390789

Excellent product and great service
Jessica - 06/08/2018



Should actually come with mounting base. 376474


Quick delivery of items. All fit perfectly. Great one stop shopping site. 369083

Show More Reviews

Ask the Experts about this Optronics Trailer Lights

  • 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...
    view full answer...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...

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Info for this part was:

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

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