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

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

Item # MCL11RKB
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MCL11RKB - Rear Clearance,Side Marker Optronics Trailer Lights
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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. Red 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 - Red Lens part number MCL11RKB can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (500)
  • Q & A (32)
  • Videos (2)
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Optronics Trailer Lights - MCL11RKB

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

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. Red 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
  • Red lens with red LEDs
  • Recessed mount with included black PVC grommet
    • Installation requires an 11/16" hole at desired location
  • 2-Wire pigtail - included 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.

MCL11RKB Optronics Uni-Lite Mini LED Side Marker/Clearance Trailer Taillight with Grommet - PC Rated - Red

Alternate part number: MCL-11RKB

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

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 Red Clearance and Side Marker Light Review

Today on our trailer we're going to be taking a look at the Optronics Uni-Light LED Clearance And Side Marker Light with a red lens. Part number MCL11RKB. Here's what it looks like once it's installed. This is going to be a fully submersible light. It's designed to work as a corner light and a marker light if you mount it on the corner of your trailer. It's going to have 2 LEDs with a red polycarbonate lens and polycarbonate body. It's going to be a grommet mount, included with our light.

Because it's LED you're not going to have any bulbs to worry about replacing or filaments to burn out. It's going to be more efficient and longer lasting and draw less power. It's going to be a 3/4 inch light requiring an 11/16ths diameter hole to mount a grommet into. It's going to be DOT approved and the LEDs are going to feature a lifetime warranty. Now that we've gone over some features, let's go ahead and install them. We have our wires coming up out of there. We'll take our new light, we'll slip our grommet up just slightly on the bottom.

We going to take our heat shrink butt connector, slide it on and we'll crimp it. Once we add them we'll go ahead and strip back our other wiring from our trailer. A little twist. We're going to match our wires, the white's going to be our ground so we'll match the white to the white and the black's going to be our power. Now we can heat up our heat shrink. You can use a heat gun or a butane torch, as long as you keep the flame away from our connector so we don't crystallize it.

You want to just keep your heat source down below and let the heat go up and you'll watch them shrink up. You're just going to look for it to pull up around the wire. That way we're going to make sure we're not going to get any corrosion in there. For a little added protection I'm going to wrap these up with some electrical tape. We'll tuck our wiring back down inside the hole. We'll take our grommet and we'll snap it back into our hole.

If you have trouble getting these in you can put a little bit of spray-silicone around it but with a proper size hole it should just work itself right in there. That's going to do it for our look at and install of the Optronics Uni-Light LED Clearance And Side Marker Light with a red lens. Part number MCL11RKB on our trailer.

Customer Reviews

Uni-Lite LED Clearance and Side Marker Light w Grommet - Submersible - 2 Diodes - Red Lens - MCL11RKB

Average Customer Rating:  4.9 out of 5 stars   (500 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. Red polycarbonate lens. Recessed mount with included black PVC grommet. 2-Wire pigtail. PC rated.


I bought a couple more of these two-diode LED clearance lights to add some more lighting to the rear of my kayak trailer. They work nice and are easy to install in 3/4" holes that I drilled through a piece of aluminum angle. The trailer has orange clearance lights on the front sides, red clearance lights on the back sides, the stop/turn/parking lights on the back, three red clearance lights on the back, and a white LED license plate light. It's really lit up and very visible at night from the rear and sides. Thanks to etrailer.com for great products and services! My wife and I like to kayak, but we don't like to deal with putting our kayaks on roof racks on the top of a car. So I bought a used Load-Rite trailer that was designed to hold one Jet Ski, and added a frame made of slotted angle and 2x6 lumber to hold the kayaks, and a cargo box from Tractor Supply to hold kayak seats, life jackets, towels, sun-protection clothing, and some spare gear (ropes etc), and bought all new LED lighting from etrailer.com. The paddles are too long for the cargo box so they have to go in the car! The kayaks are tied down to the trailer with several ropes front and rear, so there is a lot of safety factor in the design....I don't worry about the kayaks coming off the trailer! The entire rig works great....when we return from a kayak trip we just back the trailer in the barn and it's ready to go for our next trip. I put a 5" diameter wheel on the trailer just behind the hitch so I can push it around on flat level surfaces. See the pictures. 296904

Those lights, and all the lighting and trailer wiring products that I bought from etrailer.com, are working great! I used to have constant problems with the lights on my trailer until I switched everything out to the LED lights from etrailer.com! Now they work every time we use the trailer knock on wood!.
Greg - 10/17/2017



These lights are great unbelievably Bright I agree with everyone else they are great if I would've known they were as bright as they are I would've ordered another one to put on my tractor for an oil warning like they're very bright even in the daylight 122019

Still working great! i did put one on my tractor for low oil warning light and works great
Larry S - 03/24/2015



Love these l.e.d. lights. Had seen exact same lights on a new truck at work and wanted them for my personal truck. Found them here on etrailer at a great price. They are really bright for such a small light and low current draw. Simple, fast install. 109134


Great job Thanks 772447


Easy to install. Matches existing clearance lights on my boat trailer. Still working as designed. Excellent product. 768035


This is a classic American product: tough, effective, and reasonably priced. They are to be replacements on a flatbed I am installing on another truck. So that they fit is definitely a bonus. Yet I'm looking also to increase efficiency with LED bulb equivalents. This is not easy to do because most of these fixtures have bulbs so well shock mounted and with bulbs that last so long replacements are not a priority. eTrailer did a fine job of putting me in touch with people at Peterson who can provide the necessary specifications. Shipping was fast. Packaging was fine. No complaints. 747706


Lights were easy to install & Very bright. No need to worry about bulbs burning out anymore. 739521


We ordered these red marker lights for night time use on our heavy equipment, to be seen from a long distance, wow they work perfect we have installed the Amber and the red marker lights on our bull dozer that gets used after dark and we can easily tell what direction the dozer is facing from long distance, these are a great product, MCL11RKB is the red ones and MCL11AKB is the Amber lights, they both are very bright and are easy to install, a great product, we will install these an all our night equipment, thanks retailer for a great product!!!!! 717998


Top quality product 705701


The light was exactly as advertised and was perfect for me. 700679


They work great 693734


I haven’t installed my lights and tires yet but I couldn’t wait. Based on customer service and timely delivery alone, Hanna, Carol and George, awesome! Thank you! 691597


Bright but the 11/16 hole seemed to small. I used3 3/4 and it still was pretty tight. 679086


Thanks you quick delivery!! 672840


they are great! no troubles whatsoever .I have then on my boat trailer (20) on a 16 footer, even 2 clear ones for back up lights. I beat on them never even unplug them when i put it under the water to launch or land the boat ,,,,,,,, Also on my flat bed still adding ones on it lol. 671453


Great lights. Easy to install. Used on my trailer. And very quick shipping. Thanks etrailer! 663558


Love the 2 LEDs. Bright, long lasting service. I'll definitely buy these again and recommend others do as well. 649211


Still working 641423


I needed a couple of small lights for a little trailer I am building to pull my grandsons behind my golf cart and these look to be a great product at a great price. Thanks again etrailer 636652


This marker light fit perfectly on my trailer and has worked flawlessly for over a year. Highly recommend. 628526


Product was exactly what I wanted. Works great. 620404


I ordered these light to be used as accent light on a new lift table for my company. I needed low profile and fairly bright red light to be reflected off our off-white power coat. These little lights out preformed what we were hoping for. The only thing I don't like about them is the instructions say to drill a 11.16" hole. Assembly was WAY too tight at that dimension. So we stepped it up a fraction at a time and found that 17/64" (.73) and 3/4" (.75) were perfect. Even at 3/4" the grommet was snug and water tight. The light had to be squeezed into place but at 11/16" I felt like I was about to brake the light. Overall I am super pleased with the lights. We added them to the Bill of Materials and we will be ordering them for these new carts. 620141


same here works great 617075


All the products I have purchased from Etrailer have been good. Quailty, durable products, fast shipping and easy transactions. Etrailer.com has pretty much any product you need for your trailers. Thank you Etrailer! 602627


We’re upgrading a 1960 camper with LED lights throughout. These work wonderfully and are very easy to see. Good price, great service and product, highly recommended. 602469

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Info for this part was:

Expert Research:
Mike L
Expert Research:
Robert G
Expert Research:
Michael H
Expert Research:
Jameson C
Written by:
Tyler C
Video Edited:
Patrick B
Video Edited:
Jacob T
Video by:
Kathleen M
Installed by:
Cole B
Updated by:
Amy B
Updated by:
Brian T

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