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Optronics Trailer License Plate Light - Incandescent - Gray Housing - Clear Lens

Optronics Trailer License Plate Light - Incandescent - Gray Housing - Clear Lens

Item # LP51CB
Our Price: $8.70
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Shipping Weight: 0.17 lbs
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LP51CB - Incandescent Light Optronics License Plate Lights
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4" Long x 1-3/4" wide x 2-5/16" thick. Incandescent trailer light illuminates your license plate. Durable stainless steel mounting base. Stud mount to trailer - hardware not included. 1-Wire design. (1) 194 Bulb. Great Prices for the best trailer lights from Optronics. Optronics Trailer License Plate Light - Incandescent - Gray Housing - Clear Lens part number LP51CB can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (143)
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  • Videos (2)
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Optronics Trailer Lights - LP51CB

  • License Plate Lights
  • Rectangle
  • Incandescent Light
  • White
  • 4L x 2W Inch
  • Surface Mount
  • Non-Submersible Lights
  • Optronics

4" Long x 1-3/4" wide x 2-5/16" thick. Incandescent trailer light illuminates your license plate. Durable stainless steel mounting base. Stud mount to trailer - hardware not included. 1-Wire design. (1) 194 Bulb.


  • Incandescent light illuminates your trailer's license plate
  • Incandescent bulb can be easily replaced
  • Durable stainless steel base resists corrosion
  • Clear lens over incandescent bulb
  • Compatible with 12V DC systems
  • Stud mount to trailer - hardware not included
  • Single wire design grounds through mounting hardware


  • Dimensions: 4" long x 1-3/4" wide x 2-5/16" thick
  • Distance between mounting holes (center on center): 3-1/4"
  • Bulb type: 194 wedge base
  • Power draw at 12.8V: 0.2 amps
  • 3-Year warranty

Manufacturer Cross Reference
Light will work as an exact replacement for:
Peterson # M436

dimensions of light

LP51CB Optronics Trailer License Plate Light - Incandescent - Stud Mount - Stainless Steel Base - Grey Housing - Clear Lens

Alternate part number: LP-51CB

California residents: click here

Video of Optronics Trailer License Plate Light - Incandescent - Gray Housing - Clear Lens

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

Video Transcript for Optronics Ear Mount Trailer License Plate Light Review

Today on our enclosed trailer, we're going to be installing the Optronics Ear Mount Trailer License Plate Light with the plastic housing and gray in color, Part Number LP51CB. Depending on your trailer will depend on how much of the interior you may need to take apart to gain access to the wiring to install the new trailer license plate light. We've also gone ahead and removed any of the old license plate light that was still on the trailer. Now that we have our surface ready to install our new license plate light, we'll go ahead and feed the wire through the hole so that the wire goes into the trailer itself. We'll go ahead and hold our light up into place and then mark the two holes. We'll then set the light aside for now. Next we're going to take two self tapping screws and pre-drill the holes into the trailer.

We'll then back each of the screws out and then put the light up into place, feeding the wire through a center hole allowing it to go into the internal part of the trailer. Then we'll go ahead and take our ratchet and put our screws back in, holding the light in place. Now in our case we needed to remove a couple pieces of internal trim to gain access to the wiring to install the new light. Now that the trim is out of the way, you could see here that we have our wire hanging down. It's part of the running light circuit. Now that that's done, we can go ahead and connect our wiring.

We use a simple butt connector here to connect our running light wire in with the wire coming out of the back of the license plate light. The butt connector that we'll be using today is Part Number DW05714. Once our connection's made, we'll go ahead and wrap it with some electrical tape to give it a little more protection. Now we'll go ahead and test the light before we put our interior back together. As you can see here, with our running light circuit on on the trailer, our license plate light comes on. Now that we've tested it, you can go ahead and put your interior back together.

Again depending on your exact model of trailer will determine what you have to reinstall. In our case, it's a couple pieces of trim. Once our trim is back in place, we can go ahead and close the door up and that'll complete the installation of the Optronics Ear Mount Trailer License Plate Light, Part Number LP51CB. .

Customer Satisfaction Score:

Customer Reviews

Optronics Trailer License Plate Light - Incandescent - Gray Housing - Clear Lens - LP51CB

Average Customer Rating:  4.8 out of 5 stars   (143 Customer Reviews)

4" Long x 1-3/4" wide x 2-5/16" thick. Incandescent trailer light illuminates your license plate. Durable stainless steel mounting base. Stud mount to trailer - hardware not included. 1-Wire design. (1) 194 Bulb.


selection and service have been great. this is my go site for trailer parts and accessories.


Finally! This replacement item was exceptionally difficult to locate online. Thank you for having it in stock!


Perfect fit/replacement. Easy to install. Looks and works great!


The light was just as described


Just as detailed


Great service, fast shipping. Thanks


This was the perfect light for my trailer License Plate. It has not failed since installation 1 year and lots of miles!!


Just as described. I am very happy with the light. It works very nicely on my custom Beetle.


This light works well.


Product ok, but delivery time took 1.5 month...


The product is exactly what I needed but I only needed the plastic housing but I can only buy the entire unit


Perfect fit using the same mounting holes for my early 90’s Circle J Arrow.


Perfect replacement.


Got the parts I ordered in Excellent condition. Installed the Roof Vent with ease. I did have one little challenge. I disposed of the box the Roof Vent came in. It is now time to mount the license plate light. I could not find find the light anywhere. Well, I was getting ready to call E-trailers about the missing light, when I decided to get the box out of the trash. Well, it was wrapped up in the paper. Next time I will look a little closer.

Very pleased with with the products from E-trailer. They got my business and will tell my friends about E-trailer.


It's exactly what I needed and was received soon than I was expecting. Won't hesitate to buy again from Keep up the good work.

So far so good. Thanks for the follow up.
Jeff - 09/21/2016


Worked ok. It's not an exact fit like the other lights I bought from etrailer. My old light fixture had a metal frame that went around the whole license plate area; this one didn't fit exactly. Nothing wrong with this light, just a slightly different design. I made it work rather than returning it.


I'm in the process of bringing my '84 tilt bed trailer back to decent condition and needed lights, etc. I went to the website and was able to find everything I was looking for. Ordering was easy and shipping was scheduled to arrive on July 6th. To my surprise, it showed up on the 2nd, in good condition and was exactly what I was looking for. Thank you for the excellent service.


This light perfectly matched the license plate light that was damaged on our horse trailer. Since only the plastice housing and the bulb were broken, we were able to only replaced these parts. Easy-peasy repair. We will keep the ear mount base as a spare.


Good product for the price.


I purchased this to replace the license plate light cover that some kids broke playing around behind my trailer. I had problems removong the old baseplate/light fitting so I just used the lens and back cover and it fit perfectly. This was on my 2007 12x6 Haulmark cargo trailer and fit perfectly!


Light was exact replacement for my Atlas Trailer. Received the light very quickly and the entire ordering experience was pleasant and expeditiously handled


Thanks again etrailer for a job well done. great clearance lights, fast delivery.
Third time ordering from etrailer and my experience as been perfect every time.


I just bought a 2006 goose neck trailer that needed some minor repair. Wanted to match existing good parts. This was an exact replacement on this old LONGHORN trailer.


I haven't had time to install it yet, but the license plate light was exactly what I need as a replacement for the horse mangled one on the trailer. Order was received on time and good quality.


Just as listed, Works great hole spacing was a little tighter the one i took off thus the bolt went in not as straight but it works.

Still working!
Anthony - 06/27/2020

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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Michael H
Expert Research:
Michael H
Employee Laura H
Updated by:
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Employee Brian T
Updated by:
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Employee Chad S
Video Edited:
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