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Optronics Thinline LED Trailer Clearance or Side Marker Light - Submersible - 4 Diodes - Red Lens

Optronics Thinline LED Trailer Clearance or Side Marker Light - Submersible - 4 Diodes - Red Lens

Item # MCL75RB
Our Price: $9.48
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Trailer Lights
Shipping Weight: 0.07 lbs
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3-15/16" x 1-1/4". Waterproof, LED trailer light serves as either a side marker light or clearance light. Durable polycarbonate housing and lens. Multiple mounting options. Accepts standard 1-prong or 2-prong plugs. P2 rated. Great Prices for the best trailer lights from Optronics. Optronics Thinline LED Trailer Clearance or Side Marker Light - Submersible - 4 Diodes - Red Lens part number MCL75RB can be ordered online at or call 1-800-940-8924 for expert service.
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Optronics Trailer Lights - MCL75RB

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

3-15/16" x 1-1/4". Waterproof, LED trailer light serves as either a side marker light or clearance light. Durable polycarbonate housing and lens. Multiple mounting options. Accepts standard 1-prong or 2-prong plugs. 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
  • 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
  • Multiple mounting options
    • Surface mount with open-back or self-grounding bracket (sold separately)
  • Accepts industry standard 1-prong and 2-prong plugs
  • P2 rated


  • Dimensions: 3-15/16" long x 1-1/4" tall x 7/8" deep
  • Mounting holes: 3" apart on center
  • Diodes: 4
  • Power draw at 12.8V: 0.06 amps
  • Lifetime warranty on LEDs

Manufacturer Cross Reference
Light will work as an exact replacement for:
Truck Lite # 19250R
Grote # 47492

Optronics Thinline MCL75 Series 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.

MCL75RB Optronics Thinline LED Clearance or Side Marker Trailer Light - Submersible - 4 Diodes - Rectangle - Red Lens - P2 Rated

Alternate part number: MCL-75RB

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Optronics Thinline LED Trailer Clearance or Side Marker Light - Submersible - 4 Diodes - Red Lens - MCL75RB

Average Customer Rating:  4.9 out of 5 stars   (1327 Customer Reviews)

3-15/16" x 1-1/4". Waterproof, LED trailer light serves as either a side marker light or clearance light. Durable polycarbonate housing and lens. Multiple mounting options. Accepts standard 1-prong or 2-prong plugs. P2 rated.


Nice retrofit for old thin-line bases, they work - they aren't super bright, but trailer already had screw holes and bases, so it was easy replacement especially where they are molded around in fiberglass bulkhead on an older cargo trailer. for what it is, I think they're a little pricey, doing a whole trailer with them would've gotten expensive


Wow, what a difference LED clearance lights make, especially at night. It makes my business information really stand out and people who follow me really notice that. I've been wanting to go LED the past couple years and now that I recently made the change, I'm not ever going back to standard low-level light bulbs again. Thanks etrailer for offering these lights and at a very affordable price. You were almost half the price as our local part store was selling them for, plus these are more stylish as well.

Harry B.


Perfect. Still shining bright as ever.


I bought my Haulmark 12'x6' Enclosed trailer used a few months back. The trailer was in good shape but the sun faded out the marker lamps. Since I use the trailer as a landscape equipment trailer I'm usually not working at night but now with the daylight savings hour change I find myself getting home when it's dark and now those faded lamps were bugging me. Since I've had great experience in the past with I decided to take the plunge and change out the 14 marker lights to their LED versions...Wow what a difference. Not only are my lamps no longer sun faded but they are bright! Definitely was worth the money and the installation was quick since they simply snap into place.


Lights are nice and bright. Usually LED lights have wired with the correct polarity but it was a pleasant surprise to find that they can be installed either way. Made replacing the old light as snap as they fit right into the old fixture


ordered to replace the faded lights on my trailer, fit perfectly. LED will reduce the draw on my light switch.


Your products are excellent, What I like about it, they're brighter than the standard lights that were on my boat trailer. They were easy to install, they're installed and ready for the road.


always easy always fast


Much brighter and way more visible then original equipment. The only way to go!

Thanks eTrailer for the excellent service.


Was a perfect replacement for the old burned out lights on my Featherlite stock trailer!!!


Perfect replacement part, took 30 seconds to swap out my broken one. Very fast shipping and a fair price.


I am retired for one year as of now and was involved in trucking for all my working years. I have used etrailer for lights , wiring ,trailer items ect... I now have a class a diesel pusher and have gone all LED inside and out and etrailer has had everything I needed and it all worked without any problems. I will use them for all my trailer and electrical needs in the future.

Richard F.


I installed these lights on our 40 ft motor coach and have put on over 40 thousand miles since install. I drive with the lights on all the time day and nite and they still work with no issues. Thank you


Package arrived quickly and worked in expectedly had an excellent experience


Works and fits perfectly on my 2 horse Featherlite trailer! Thank you!


Worked exactly as intended! Converted entire trailer to LED


Great service and fast delivery.


Love the lights nice and bright


Plugged into existing mounts. Much brighter and updates look. Very happy with these components.


The items I ordered came quickly after I placed the order. Replacing the old lights with the new LED lights was easy and it made a big difference in making the trailer easier to see not only at night but seeing the brake lights in the daylight hours. The roof hatch was a easy replacement for the original one. I know the metal one won’t crack and break like the plastic one that was original equipment. After investing in a trailer to haul the hot rod that has taken years to build, make sure the other guy that’s not paying attention can see you and your investment


I replaced all the marker lights on an older enclosed trailer. Easy and looks great. No more loose blown bulbs. Thankyou


Not my first order from etrailer and definitely not my last. My only complaint would be in the packing of small or fragile items loosely in a box with heavier items. One of the trailer light mounts was broken when it got here. No other issues though.

Etrailer Expert

Laura E.


We do our best to package our orders so that they will arrive to you in good condition. I will send this to our shipping department manager for review.


I was so ready to go to LED lighting for my trailer. I also found the website very user friendly,was able to quickly find and choose exactly what I wanted and a very reasonable price.,will definitely be using the site for more purchases.
Thanks to all the staff

Joel C.


Product is doing great,,thanks


Poor/incomplete product description. These are obviously replacement lamps for some type of fixture. These are not meant to stand alone with wire pigtails that you can use to replace existing trailer lights. I'll have to return these now.

Etrailer Expert

Mike L.


As mentioned in the product description above, the lamps are mounted using the pigtails and surface or grommet mounts which are sold separately. These items arent included because the mount and pigtail needed will depend on how youre mounting the lamp.


Great replacement parts for my enclosed box trailer that was damaged in the Camp Fire in 2018. The trailer held up pretty well but the marker lights, tail lights and fender lights all melted during the fire. These were perfect replacements and mounted very easily.


I bought the series of thin line replacement lights for my 2005 Haulmark trailer. They fit and worked perfectly, are as visible as the originals (with restored color as well - the old ones were sun-faded) while drawing much less power.

Now the 5 amp fuse that most cars have for a tail light will safely run all of the tail, clearance, and interior lights on the trailer without blowing the fuse.

The first time I plugged in the trailer with the original lights it blew the fuse (without even the interior lights on).

Buying these lights was the perfect solution. Now any flat 4-wire plug on any car can be used to operate the trailer.


Excellent products. These lights work perfectly, are rugged and seem to last. The license plate lights are super bright so law enforcement have no problem reading the plate which avoids unnecessary stops. The lights are directs replacements as well so no modifications needed. Great products. I recommend etrailer to many of my friends and colleagues.

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