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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
Our Price: $3.35
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Shipping Weight: 0.03 lbs
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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. Great 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 or call 1-800-496-5010 for expert service.
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  • Reviews (626)
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  • Videos (2)
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Optronics Trailer Lights - MCL11CRKB

  • Clearance Lights
  • Round
  • LED Light
  • Red
  • 3/4 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 Optronics Trailer Lights - Clearance Lights - MCL11CRKB Review

Today we'll be reviewing part number MCL11CRKB. This is the mini LED side marker and clearance light. It's going to be a red light with a clear lens. This is from Optronics. This is going to serve two functions, again working as a side market and clearance light. It is PC rated, so it's going to produce a 90 degree angle of light, left and right, when mounted at a 45 degree angle.

It's got the long lasting, super bright LED's. They're going to be a great replacement for incandescent lights. The multi-diode design is going to optimize light output. You don't have to worry about replacing any bulbs and they're going to be a lot more efficient providing brighter light with less power. The lens is a crystal clear lens, impact resistant, polycarbonate material. It is going to be sealed so it's going to be waterproof.

So when it comes to the housing and the lens you have a sealed, waterproof design. It's also going to feature a two-wire design. You're going to have your black wire which is going to be the power lead. Then you're going to have the white wire which is going to be your ground wire. You can see that you have the ends exposed, but it is protected with a nice insulated covering. This is Department of Transportation compliant.

It also meets FMVSS108 requirements in any 360 degree position. It's going to be a round light. The dimensions are going to measure 3/4 of an inch in diameter. If we separate it from the grommet it's going to measure 15/16 of an inch in depth. So you can see there that, that grommet easily comes out that way you can and attach the grommet to the trailer or whatever application you're going to use to mount this to.

And then stick the light through and all you have to do is push it down in position for a nice snug, secure fit. It's going to have two diodes. The power draw is going to be 0.047 amps at 12 volts. The installation does require 11/16 of an inch hole at the desired mount location. The grommet is made from a PVC construction. We're going to go and hook it up to our external power source. We're going to connect our ground wire and then we'll connect our power wire. We'll go and turn off our overhead lights. Turn on our power source. You can see there that we have a nice bright red LED light. It's got the two LED bulbs in there you can see glowing. The clear lens allows for a lot of light to shine through and those LED's are very bright. That's going to do it for today's review of part number MCL11CRKB. This is the mini LED side marker and clearance light from Optronics. .

Customer Satisfaction Score:

Customer Reviews

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

Average Customer Rating:  4.8 out of 5 stars   (626 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.


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

Product is still performing as expected with no issues.
Khaaliso - 08/17/2022


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


Got all my parts expect for one, looks like they couldn’t find the correct light so they just threw a random one in that looks similar.

Plus got told on a previous item it would had shipped many many times over a month period when it never had. Got told yesterday it wouldn’t be in stock till May…

Oh no! I am sorry that the incorrect light was shipped out. I will have our Customer Service team reach out to assist you.
-- Etrailer Expert Jenny N - 11/23/2022


These were a perfect match to the existing lights on my Sundowner horse trailer. etrailer had the right information to match these for placing my order.


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.


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 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 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.


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.


Bright leds


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.


Nice lights fast shipping excellent service.


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.


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.


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


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 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


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.


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


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


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.


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


These are great lights very durable very bright.

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


Beautiful quality light, excellent construction and brilliant color.


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

Show More Reviews

See what our Experts say 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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