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Uni-Lite LED Clearance and Side Marker Light w Grommet - Submersible - 2 Diodes - Clear Lens - Red

Uni-Lite LED Clearance and Side Marker Light w Grommet - Submersible - 2 Diodes - Clear Lens - Red

Item # MCL11CRKB
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Optronics LED Light Trailer Lights - MCL11CRKB
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3/4" Round. Waterproof mini trailer light with 2 red LEDs functions as both a clearance light and a side marker light when properly mounted. Clear polycarbonate lens. Recessed mount with included black PVC grommet. 2-Wire pigtail. PC rated. Lowest Prices for the best trailer lights from Optronics. Uni-Lite LED Clearance and Side Marker Light w Grommet - Submersible - 2 Diodes - Clear Lens - Red part number MCL11CRKB can be ordered online at etrailer.com or call 800-298-1624 for expert service.
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  • Reviews (578)
  • Q & A (2)
  • Videos (2)
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Optronics Trailer Lights - MCL11CRKB

  • Clearance Lights
  • Round
  • LED Light
  • Red
  • 1 Inch Diameter
  • Recessed Mount
  • Rear Clearance
  • Side Marker
  • Submersible Lights
  • Optronics

3/4" Round. Waterproof mini trailer light with 2 red LEDs functions as both a clearance light and a side marker light when properly mounted. Clear polycarbonate lens. Recessed mount with included black PVC grommet. 2-Wire pigtail. PC rated.


  • Small, round trailer light functions as both a clearance light and a side marker light when properly mounted
  • Sealed, waterproof construction 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
  • Polycarbonate lens and housing
  • Clear lens with red LEDs
  • Recessed mount with included black PVC grommet
    • Installation requires an 11/16" hole at desired location
  • 2-Wire pigtail - includes power lead and ground wire
  • DOT compliant
  • PC rated


  • Light dimensions: 3/4" diameter x 7/8" deep
  • Grommet diameter: 11/16"
  • Diodes: 2
  • Power draw at 12.8 volts: 0.03 amps
  • Lifetime warranty on LEDs

Optronics light dimensions

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 circuit board is sealed, which means that water will not damage the diodes or circuit board.

PC-Rated Lights

Diagram of light spread for PC rated light

A PC-rated light produces a 90-degree angle of light to either side of its centerline for a total of 180 degrees of coverage. This beam pattern can be clearly seen when you are standing directly in front of the light, as well as when you are standing on either side of the light. When properly installed, this type of light can function as both a front clearance light and a side marker light or as a rear clearance light and a side marker light.

MCL11CRKB Optronics Uni-Lite Mini LED Side Marker/Clearance Trailer Taillight with Grommet - PC Rated - Clear Lens with Red LEDs

Alternate part number: MCL-11CRKB

California residents: click here

Video of Uni-Lite LED Clearance and Side Marker Light w Grommet - Submersible - 2 Diodes - Clear Lens - Red

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Uni-Lite LED 2 Diode Clear Clearance and Side Marker Light Review

Today, on this trailer, we're going to be taking a look at installing the Optronics Uni-Lite LED Clearance and Side Marker Light with Grommet, part number MCL11CRKB. The light's going be a 3/4" diameter, with 2 LEDs in a polycarbonate lens and housing. It's going to fit into our rubber grommet, that's included with our kit, and since they're LEDs, there's not going to be any bulbs to replace, they're going to be more efficient, and use less power. These are going to be a great replacement for an incandescent bulb, or a nice addition to any other LEDs that you might have on your trailer. Now, these 2 feature a clear lens with red LEDs, and it's going to be fully submersible. It is DOT compliant, and it's going cast your light at 90 degree angles, so it would be perfect for mounting on the corner of the trailer. Now that we've gone over some features, let's show you how to install them.

Now, our lights are going to require an 11/16" diameter hole to mount the grommet in and push our light into. We already have our wire run out of our 11/16" hole that we've drilled. We're going to take our light, we're going to put our heat shrink butt connectors, crimp them in. Now, you want to make sure you have a good pair of crimpers so we don't over-crimp the wire and damage the connector, or leave it too loose where it can come out. Now we can strip back our wires, and we're going to match our colors: The black to black, in this case, it's going to be our power wire, we go ahead and crimp that one down, and we'll do the same thing on the other side. Now we need to heat these up.

You can use a heat gun, if you don't have a heat gun, you can use a small butane torch, as long as you keep the heat far enough away where you're not going to damage the connector. You'll see them 00:02:00 start to pull up around the wiring. You just want to keep your heat source far enough away where you're not burying up your wiring or crystallizing the connection. Now you want to make sure you had your, slide your grommet on before you make your connections, because it has to go in before we put our light in, onto the vehicle. We're going to put some electrical tape on here, just to give us a little extra protection on our connection, and we can tuck it neatly into the hole.

Now, we'll press our grommet into the hole first, and take our light. We want to put this, the two raised-up sides, straight up and down. You want to be careful not to push the grommet through in to the inside of the tube, or you'll have to start all over again. Now, their light installed, you can see these two LEDs. They're going to give you a nice bright light for a clearance light, or a rear light, on our trailer. That's going to do it for our look at the Optronics Uni-Lite LED Clearance and Side Marker Light with Grommet in Red, part number MCL11CRKB on our trailer..

Customer Reviews

Uni-Lite LED Clearance and Side Marker Light w Grommet - Submersible - 2 Diodes - Clear Lens - Red - MCL11CRKB

Average Customer Rating:  4.9 out of 5 stars   (578 Customer Reviews)

3/4" Round. Waterproof mini trailer light with 2 red LEDs functions as both a clearance light and a side marker light when properly mounted. Clear polycarbonate lens. Recessed mount with included black PVC grommet. 2-Wire pigtail. PC rated.


Great item at a great price. Purchased 4 clear with red (2-diodes) to place in my rear step bumper in place of back up sensors for my older truck used as clearance/running lamps. Fitment was up to me being had to locate rubber grommets to adapt to these smaller 3/4" lights to the 1 1/8" bumper holes. I would give these 5 stars but for some reason the black wire is the HOT, while any automotive electrical item I be ever worked on the BLACK was the ground! Opposite here and recommend testing them before you hook up like I did then had to reverse wires.. Silly mistake on my part but why is the black (+) and white (-) ??? Otherwise they're bright and add to my otherwise dark OEM tail lights for increased safety. Pic shown is during daylight!

Still bright and working great. Excellent product.
Billy M - 06/04/2017


Lights are very bright and easy to install. Highly recommended!


Great little running light puck! Very bright even in daylight.

Small but bright, still working great. Blend in well with the trailer in the daylight but stand out very bright at night
Joseph C - 12/29/2020


Great lights that I used for the center brake lights on my Jeep. Fit was perfect and installation was easy. These lights are super bright. No complaints.


Great light. I am happy with it. Perfect replacement size.


I installed these on my boat trailer to replace the existing lights that came on the trailer. These lights provide a much cleaner install into the crossbars and are much brighter. Install was very simple as well.


These are well built marker lights. That are small but supply a huge amount of light. I have been running them on my boat trailer for 3 yrs with no failure. Or any moisture problems in a submersible application. I recently installed them on the Jeep. ONLY MARKER I WILL RUN.


Had to change my order. Talked with etrailer rep who quickly changed my order and refunded me the cost difference. Very professional and helpful customer service reps. Timely delivery of quality products. Thank you very much. I will definitely order from etrailer again! I will also recommend etrailer to my friends.


Just got the lights installed today in a set of fender flairs for the Jeep. Really nice product fit and quality. Even better was the Customer Serice from Etrailers along the way.


Awesome marker lights, really like the size and shape and the fact that they are clear for my complete clear trailer light set up


I recently came into a 12' popup trailer, and upon bringing it home I realized that the rear light plastic had decayed to the point where it was falling apart. I found etrailer.com and fell in love with their well-made website, with it's massive lighting collection that was well curated and organized. It was clear to me that the people at etrailer.com are really passionate about trailer lighting! The videos of each product were awesome and really helped me figure out what I wanted to get. The lights came exactly as promised and were easy to install. These lights, while small, are bright and easy to see, even in the daytime. Will highly recommend!


The lights themselves are fine. I've drilled the instructed hole size, (11/16"), and they won't go in. There's a fine line to keep from going too large with the hole. Also the lights were not marked as to color. I had to test them and mark them. I'm rebuilding a trailer and am using these on the outer front and rear fenders as marker lights. It will be a while before they are installed.


Bought these for a winter project when the snow falls. I have purchased the yellow and red a few years back and thought I would give these a try. If they are like the last ones we bought, we will love them. Keep supplying great products for us to use. Thanks.


Nice lights fast shipping excellent ser vice.


These are great lights very durable very bright.

great product will buy again when needed..
Marvin - 01/27/2020


I have used these lights for years I’m building a all aluminum trailer when I’m finished with it I’ll send some pictures these lights are the best


Product is awesome holding up well. Son and I are building another trailer will definitely buy these again.


Perfect replacement part. Had to change my order. Was quickly handled by customer service. Thanks!!!!


Exactly what I was looking for. Perfect replacements. Thanks etrailer.


Quick delivery. Good product, very bright. For .125" wall thickness, Used 3/4' dia. hole to install.


Beautiful quality light, excellent construction and brilliant color.


Quality products at a reasonable price delivered as expected. Good company


These lights are very bright and so far I have not had any problems out of the couple hundred I bought. With a lifetime warranty light you can't go wrong with these.


Works well.. easy to install


Great product. great visabilty night or day.

Show More Reviews

Ask the Experts about this Optronics Trailer Lights

  • Installation and Details of Optronics Mini LED Lights # MCL11CRKB
    I contacted our representative at Optronics about the Mini LED Lights, part # MCL11CRKB. I have attached a side angle view of this light that our representative at Optronics sent. At this time we do not have installed pictures of the light or a video of the light. The lens cover sticks out slightly as you can see from the picture and the black ring is the grommet. To install, you will need to have an 11/16 inch hole drilled to insert the grommet. Then, the light pushes into the grommet...
    view full answer...
    Image 1 for
  • Red and Amber Trailer Clearance Lights with Clear Lenses
    You are correct, clear lenses are not made for lights # MC32AB or # MC32RB. The bulbs for both of these lights produce white light so if clear lenses were on them the light would just be white. Unless you found colored bulbs that would fit. We do have red and amber marker/clearance lights with clear lenses though. For example we have # MCL63CAB which is an amber LED light with a clear lens. Other amber options include # MCL13CA2B, # MCL51CAK, # MCL65CAB, # AL91CAB, # MCL17CAB, # 00212336P,...
    view full answer...

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Info for this part was:

Employee Tyler C
Written by:
Tyler C
Employee Reno H
Expert Research:
Reno H
Employee Jacob T
Video Edited:
Jacob T
Employee Kathleen M
Video by:
Kathleen M
Employee Cole B
Installed by:
Cole B
Employee Amy B
Updated by:
Amy B
Employee Wilson B
Updated by:
Wilson B
Employee Brian T
Updated by:
Brian T

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