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Optronics

Optronics Mini Trailer License Plate Light - Chrome Plated - Incandescent - Rectangle - Clear Lens

Part Number: LP31CB

81 Reviews | 10 Questions

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$6.73

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optronics trailer lights license plate 2-9/16l x 1-1/4w inch lp31cb

optronics trailer lights non-submersible 2-9/16l x 1-1/4w inch lp31cb

optronics trailer lights license plate mini light - chrome plated incandescent rectangle clear lens

optronics trailer lights license plate non-submersible

optronics trailer lights license plate non-submersible lp31cb

optronics trailer lights license plate 2-9/16l x 1-1/4w inch

optronics trailer lights license plate 2-9/16l x 1-1/4w inch mini light - chrome plated incandescent rectangle clear lens

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2-9/16" x 1-1/4" Rectangle. Incandescent trailer light illuminates your license plate when properly mounted. Durable chrome-plated housing. Gasket helps create a weathertight seal. Surface mount to trailer. 2-Wire design. (1) 194 bulb. Great Prices for the best trailer lights from Optronics. Optronics Mini Trailer License Plate Light - Chrome Plated - Incandescent - Rectangle - Clear Lens part number LP31CB can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.

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Reviews (81)
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Optronics Trailer Lights - LP31CB

Highlights

Keeps Your Plate Visible: Clear lens and incandescent 194 bulb light up your license plate.
Clean, Durable Look: Chrome-plated housing resists wear and keeps a polished finish.
Simple 2-Wire Hookup: Power lead and ground wire make connection quick on 12V DC systems.
Stays Sealed Tight: Foam gasket forms a weathertight seal against moisture.
Compact Fit Anywhere: 2-9/16" x 1-1/4" x 1" rectangular body mounts with 2" center holes.
Road Legal: DOT certified for compliant trailer lighting.

Features to know about

Reliable License Plate Lighting: Compact and Bright Incandescent Design

This small but effective light keeps your license plate clearly visible. Measuring 2-9/16" long by 1-1/4" wide, it uses a single 194 bulb behind a clear lens to provide bright, even light when properly mounted. It runs on 12V DC power and draws only 0.261 amps at 12.8V, making it efficient for continuous use without putting a strain on your electrical system.

Built to Last: Durable Chrome-Plated Housing

You won’t have to worry about rust or fading here. The chrome-plated housing is tough, giving the light a clean look that holds up over time. It’s designed to stand up to outdoor conditions while keeping its shine, so your setup stays neat and professional-looking.

Weather Protection Where It Counts: Foam Gasket Seal

Water infiltration can quickly ruin a light, but this one has a foam gasket that helps create a weathertight seal. When installed correctly, it helps block out moisture and dirt from getting into the housing or wiring connection, so the light stays reliable even in wet conditions.

Straightforward Mounting: Surface Mount with Two Wires

Installation is simple thanks to the surface-mount design and standard 2" center-to-center mounting holes. The 2-wire setup includes one power lead and one ground wire, so wiring is quick and clear. Just use up to 1/4" screws (hardware not included) to secure it in place, connect the wires, and it’s ready to go.

Certified for Road Use: DOT Approved Replacement Fit

This light meets DOT requirements after testing for compliance, giving you peace of mind that it’s built for legal road use. It also matches several common part numbers—Uni Bond #DL2020, Grote #60151, and Peterson #M434—making it an exact replacement option when you need a dependable update without modification.

Specs

Dimensions

Overall dimensions: 2-9/16" long x 1-1/4" wide x 1" thick
Distance between mounting holes (center on center): 2"

Dimensional diagram of the Optronics Mini Trailer License Plate Light LP31CB showing 2-9/16 inch length, 1-1/4 inch width, 1 inch thickness, and 2 inch mounting hole spacing; chrome-plated rectangular housing with clear lens.

Dimensions: 2-9/16" long x 1-1/4" wide x 1" thick
Distance between mounting holes (center on center): 2"

Electrical

Bulb type: 194
Power draw at 12.8V: 0.261 amps
System compatibility: 12V DC

Warranty

Warranty: 3-Year warranty

Manufacturer Cross Reference

Uni Bond #: DL2020
Grote #: 60151
Peterson #: M434

LP31CB Optronics Mini Trailer License Plate Light - Chrome Plated - Incandescent - Rectangle - Surface Mount - Clear Lens

Alternate part number: LP-31CB

Customer Satisfaction Score:

99% were satisfied with this product

1% of customers were not satisfied

Wrong item was ordered

1% of customers were not satisfied

Wrong item was ordered

4.7

81 reviews

5 Stars		(67)
4 Stars		(10)
3 Stars		(2)
2 Stars		(1)
1 Star		(1)

by: Roy 04/22/2026

License plate light works great

by: William 04/06/2026

Works as designed

by: David 07/19/2023

Great price,quality product and great shipping time.

David One Year Later

7/20/2024

Very good.

by: L.Tulik 09/23/2013

We had bought a replacement bumper for our truck, it came with a new license plate light, but it was only the hot wire, it was supposed to ground(?) to the powder coated bumper or attach a ground wire to it since the old light was too big for the hole. This light is a great option, we'll have to drill a couple small holes, but a much better alternative. The light itself is very well made & looks easy to replace the bulb.

by: David C. 05/11/2018

Used these as replacement license plate lights for my 1976 BMW 2002 restoration. The originals, when available, are running $50+ each, and these lights are a very close match in style and fitment at a fraction of the price. They also appear to be well made - chromed metal where BMW used plastic.

by: Tim 04/22/2025

Perfect for illuminating the trailer plate after moving it to the gate.

by: Gene 07/03/2016 One Year Later

Perfect for my application to light license plate from two sides on home-built teardrop trailer. Still working after over 11,000 miles of travel.

by: Ron m 12/05/2014

Nice light for the price. Rewireing 3 different trailers to bring of to specs. This is the the third order in 6 mos. everything has been great. Will use again as I need more items. Great place

by: Dennis 10/20/2016

Product not installed yet but should work fine. Light will be installed on our 1988 motorhome. Good delivery time. Price was right

by: Kevin F. 05/13/2011

and works well. The price was great too. Thanks for good products, fast shipping and good prices. Kevin F.

by: Tim L. 10/17/2013

I needed to relocate license plate and this light looks to be just fine for what I need.

by: Bj 02/09/2023 One Year Later

Light works as advertised and glad that etrailer had it in stock at the time.

by: steve 10/06/2014

I'm fixing up a horse trailer, and the new license light looks great. thanks.

by: Ben A. 02/17/2016

Very fast shipping! Tires came on the wheels and were inflated. Great experience.

by: Stan L 01/14/2017

Product was just like listed, fast shipping.

by: Ted 04/07/2014

the lights I received are good quality very reasonably priced. I have bought from etrailor in the past as I will without a doubt purchase more in the future. Great products and quick service. thanks

Ted One Year Later

4/7/2015

Still 5 stars and very happy Thanks

by: Rick L. 07/20/2011

Wed. morning! Lights were exactly as presented and perfect for my application. Great price and great service. I am extremely satisfied.

by: John S. 03/12/2017

Excellent product and excellent customer service.

by: Bob S. 10/12/2016 One Year Later

It was a perfect replacement for the one that was damaged.

by: Don 05/06/2016

Excellent and great price.
Will be installed on my D Type jaguar to light the race number on the side of the car.

by: David 02/07/2013

Good product, fast shipping.
Thanks!

by: Mark 07/28/2023

Good price.Prompt shipping and delivery.

by: Carl 11/27/2022

1988 Dodge Van

Worked for replacing my floor lighting in my class b sure light the floor and entry lighting

by: Mel 08/11/2014

Very good replacement. Everything I bought was good. There's a reason I'm a repeat customer.

by: Denver P. 07/08/2014

great service, product and Price!!!!!!!!!!!!!!! Thanks for everything.

Denver P. One Year Later

7/8/2015

Great no problems

true

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See what our Experts say about this Optronics Trailer Lights

Do you have a question about this Trailer Light?

How do the Hook Up the 2 Wires on the Optronics Mini Trailer License Plate Light - Chrome Plate?
Hello Mike, Thanks so much for the picture, it’s super helpful! When installing the Optronics Mini Trailer License Plate Light # LP31CB, you’ll just need to connect one wire to your power source or running light circuit, and the other wire to a solid ground. What kind of trailer is this being installed on?
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Replacement License Plate Light For 2009 Haulmark 7x12 Low Hauler Trailer
I did some research on your 2009 Haulmark Low Hauler trailer. I was able to see several different styles of license plate lights and holders on trailers. I have attached a link to our product page for license plate lights. Some have the license plate holder attached to the assembly and some are just the lights that are mounted to light the license plate. There are different opinions about mixing LED and incandescent lights on the same circuit. We have had customers that wire them in the...
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Trailer license Plate Light with a Replaceable Bulb
The Optronics license plate light # UL94CB is sealed so you cannot change the bulb. The bulb that is used is a long-lasting heavy duty bulb but you cannot access it. We do have other license plate lights that might work for you. I have linked the license plate lights we carry. One example is # LP31CB. It does feature a replaceable bulb.
view full answer...
Replacement Bulb for the Optronics Mini Trailer License Plate Light # LP31CB
To replace the bulb in the Optronics Mini Trailer License Plate Light # LP31CB you will simply need the Replacement Side Marker Light Bulb 194 # A194B.
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Is the Optronis License Plate Light Bracket Flat
The Optronics License Plate Light Bracket # BK31BB is a flat bracket. This bracket is designed to work with either the Optronices Mini Trailer License Plate Light # LP31CB or the LED version # LPL31CB
view full answer...
Troubleshooting License Plate Lights Not Working on 2001 Mazda Tribute with Tow Package
The license plate lights should not have anything to do with your fuse blowing or your stop lights. Most likely there is a short blowing your fuse. If you don't locate and repair the short, you will continue to blow up fuses. You'll need to start at the connector and examine it for damage. Then work your way all the way back to the Rola LED Light Kit, checking for pinched wires, loose connections or cracked and worn wire insulation. Fix the short and you should be good to go.
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What Size Fastener Fits License Plate Light LP31CB
At most you would use 1/4 inch screws with license plate light # LP31CB. A 10mm would be too large. Generally speaking 1/4 inch is about as large as you can go on most license plate lights. We have # LP81BB which does have a separate ground wire though you could ground it right at the mounting hole using the screw used to mount the light (either side).
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Recommended Trailer License Plate Light For Trailer Tail Gate
For your trailer tail gate mounted licence plate, I recommend the LED Trailer License Plate Light - Submersible - 2 Diodes - Round - Clear Lens # LPL12CB along with the Ear Mount Bracket for Optronics LPL12CB Trailer License Plate Light - Gray Polycarbonate # A11GLPB or the Mini Trailer License Plate Light - Chrome Plated # LP31CB for an incandescent option. Either of these will fit your 1-3/8 measurement for clearance.
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Is the Mini Trailer License Plate Light # LP31CB DOT Certified
Yes, the Mini Trailer License Plate Light # LP31CB had to go through testing to be DOT certified, my contact at Optronics confirmed this.
view full answer...
Recommended Light With Black Base For RV Courtesy Light
We do not carry a courtesy light with a black base like the Optronics RV Courtesy Light - 2 Wire - Oval - Incandescent - Clear Lens w/White Base # 2407764B you referenced. You may consider using a different style of light that will serve the same purpose. I recommend the Mini Trailer License Plate Light - Chrome Plated # LP31CB which has a black base as a possible solution for your application.
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Info for this part was:

Expert Research:

Michael H

Updated by:

Laura H

Updated by:

Brian T

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