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Optronics LED Clearance or Side Marker Trailer Light w/ Reflector - 1 Diode - Round - Red Lens
Optronics

Optronics LED Clearance or Side Marker Trailer Light w/ Reflector - 1 Diode - Round - Red Lens

Part Number: MCL0040RBB
In Stock
$9.77
Trailer Lights
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Product Images

2-1/2" Round. Low-profile LED trailer light serves as either a side marker or clearance light. Built-in reflex reflector. Snap-on polycarbonate lens. Surface mount with included gasket - hardware not included. 2-Wire design. P2 rated. Great Prices for the best trailer lights from Optronics. Optronics LED Clearance or Side Marker Trailer Light w/ Reflector - 1 Diode - Round - Red Lens part number MCL0040RBB can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Optronics Trailer Lights - MCL0040RBB

Highlights

  • Brighter, Low-Draw Lighting: One LED diode gives bright light while drawing only 0.073 amps at 12V.
  • One Light, Two Uses: Works as a clearance or side marker light for flexible placement.
  • Built-In Reflector: Reflex reflector removes the need for a separate reflective piece.
  • Slim, Durable Build: 2-1/2" round, 15/16" thick design with polycarbonate lens and ABS housing.
  • Simple Surface Mount: Lays flat with gasket for a weathertight seal; hardware not included.
  • Reliable, Long Life: LEDs last up to 50 times longer than incandescent bulbs.

Features to know about

Brighter and More Efficient Lighting: 1-Diode LED for Clear Visibility

This 2-1/2" round LED clearance or side marker light puts out a clean, bright red glow that’s easy to see at night. The single white LED behind the red lens draws only 0.073 amps at 12V, giving you high visibility with very little power use. LEDs last up to 50 times longer than traditional bulbs, so you can forget about dealing with burned-out filaments or dim lights over time.

No Need for Extra Reflectors: Built-In Reflex Reflector

The integrated reflector saves space and effort by removing the need for a separate piece. The built-in reflex design reflects light from other vehicles even when the LED isn’t lit, keeping your trailer visible whether it’s parked or moving. It’s a small but smart detail that adds safety without extra hardware or wiring.

Simple and Clean Installation: Surface Mount with Gasket

Mounting this light is straightforward thanks to its surface-mount design. It secures flat against your trailer using standard hardware (not included) and only needs a small hole for the wiring. The attached gasket helps form a weathertight seal against the surface, keeping moisture out and the light steady in place. The 2-wire pigtail setup—one for power and one for ground—makes hardwiring simple and quick.

Durable Construction That Lasts: Polycarbonate Lens and ABS Housing

Built for regular use, the snap-on polycarbonate lens and black ABS housing hold up well against bumps and exposure to the elements. The lens locks tightly into place for a secure fit but still pops off easily when replacement is needed. Even better, the LEDs are backed by a lifetime warranty, giving you dependable lighting that’s made to last.

Reliable Coverage Where It Counts: P2-Rated Beam Pattern

The P2 rating means this light produces a 90-degree beam spread—45 degrees to either side of centerline—perfect for use as a clearance or side marker light. It’s bright when viewed straight on but won’t overwhelm from the side, making it ideal when paired with other lights for full coverage around your trailer.

Specs

Quantity

  • Quantity: 1 clearance/marker light

Dimensions

  • Overall diameter: 2-1/2"
  • Thickness: 15/16"

Technical diagram of Optronics MCL0040RBB red round LED clearance or side marker trailer light showing dimensions and mounting layout.

Electrical

  • Diodes: 1
  • Power draw at 12V: 0.073 amps

Warranty

  • Lifetime warranty on LEDs

Installation diagram showing how a surface-mount trailer light attaches to a trailer surface using a flange or bracket with mounting holes.

MCL0040RBB Optronics LED Clearance or Side Marker Trailer Light with Reflex Reflector - 1 Diode - Round - Black Base - Red Lens - P2 Rated





Customer Satisfaction Score:

Ratings & Reviews

4.8

4494 reviews
5 Stars
(3857)
4 Stars
(447)
3 Stars
(84)
2 Stars
(37)
1 Star
(69)
Review sort icon
2-1/2" Round. Low-profile LED trailer light serves as either a side marker or clearance light. Built-in reflex reflector. Snap-on polycarbonate lens. Surface mount with included gasket - hardware not included. 2-Wire design. P2 rated.

by:

Just what I needed.



by:

I was able to find what I needed and I placed order. I was notified my order was in process and when sent. Received order when in a couple of days. Thanks



by:

Easy to install!



by:

Marker lights are just what I needed. Would purchase again.



by:

Fit perfectly. Wish they had just the light cap but at least I could find something. Fast shipping



by:

Correct part the first time, quick shipping, kept me informed as needed, no complaints here. I will definitely use etrailer.com for future purchases.



by:

great product, worked really good



by:

Fast service and perfect website

Can
you help me to find an outside solar lamp for my Coleman Rubicon 1200?

Jenny N. profile picture

Jenny N.

5/15/2024

I do have two solar powered lights to take a look at. The first is part # 287-32013, the Goal Zero Crush Light Solar Lantern. The second is part # 287-32013, the Goal Zero Crush Light Chroma Solar Lantern which gives color options. Both provide up to 60 lumens of light on the highest setting and runs for 35 hours on the lowest.



by:

hard to find surface mount side marker light for old RV, just what i was looking for.



by:

Easy to install, bright, and fits perfe ctly!



by:

This Optronics Light is the exact replacment I needed as a side marker on our 2021 Forest River TT. Fit perfectly. Comes with no hardware but I have a garage full of screws. Heat shrank the pig tails to existing bundle.



by:

Perfect fit and perfect match to existing lights. Thank you!

Donald profile picture

Donald

2/10/2025

Working perfectly with no issues. Thank you!

Jameson C. profile picture
Etrailer Expert

Jameson C.

2/10/2025

@Donald Awesome!


by:

It was one of the easiest orders i have ever placed!

Nice Job - etrailer!

Kevin profile picture

Kevin

3/27/2023

Great! No issues whatsoever!



by:

Very overpriced here. I purchased 2 of these for my RV, only to find them on the shelf at a local RV dealer. And for less than half of etrailers price. These are good lights, but I will be returning these.



by:

I orderd this side marker light the price was fair the shipping was fair it was the perfect item I needed. It worked great and still is working great. It is what you expect from etrailer. Good company to do business with.



by:

We purchased several items from etrailer.com. The buying process was easy as most online purchases. The thing that stands out is the communication after the purchase - acknowleging the purchase, informing when it ships and following up after notification of delivery. Nowadays it rare to receive good customer service. This is one company that is doing it right!



by:

Direct plug and play, great visibility.



by:

I was struggling to find these lights until I came across your website. They were the exact replacement for my trailer. Easy to install and super bright. They arrived super fast also.



by:

Bright light, good quality, great price



by:

Exact item needed at a great price with shipping



by:

Nice product as expected



by:

Installed easy and work as designed and don’t cost alot



by:

Great place I'd like to live across the street



by:

Excellent price, well made or cheap loo king!



by:

Exact copy of my factory light!


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See what our Experts say about this Optronics Trailer Lights

  • Replacement Lens and Side Marker Light Options for 2.5 Inch Round Optronics RV Marker Lights
    Rey, I completely understand wanting to get the correct replacement the first time because with RV marker lights, even a small difference in diameter, wiring style, or reflector design can turn a simple swap into a frustrating rewiring project. Based on your description, I actually think you may be using the Optronics LED Clearance or Side Marker Trailer Light with Reflector part # MCL0040RBB since you mentioned the built in reflex reflector and the red lens style. If this is the correct...
    view full answer...
  • Is the optronics LED Trailer Clearance Light MCL55RB a Reflector
    Hey Rex, the Optronics LED Trailer Clearance or Side Marker Light # MCL55RB is not a reflector unfortunately. If you needed a reflector you'd want to use the Optronics LED Clearance or Side Marker Trailer Light w/ Reflector # MCL0040RBB. This light is a bit wider than # MCL55RB but it does have that built in reflector. This light also does not have the industry standard two prong plug but it can easily be wired into any 12v system with its two wire configuration. If there is anything...
    view full answer...
  • Replacement 2-1/2 Inch Red and Amber Clearance Lights for 2018 Kodiak Travel Trailer
    Thank you for the photos, that really helps! It looks like you're needing the 1-diode 2-1/2" round lights from Optronics; Red # MCL0040RBB and Amber # MCL0040ABB. The lens looks to be the same design and the bases have the same mounting design as what it looks like you have as well. I've attached review videos for you to check out.
    view full answer...
    Image 1 for Image 2 for Image 3 for
  • Recommended Replacement Clearance Lights For A 2018 Kodiak Cub Travel Trailer
    The closest option we carry to what you have in your pictures is going to be the Optronics LED Clearance or Side Marker Trailer Light w/ Reflector - 1 Diode - Round - Amber Lens # MCL0040ABB. It's a surface mount design like what you already have and is 2.5" in diameter. For the red clearance light you can use the Optronics LED Clearance or Side Marker Trailer Light w/ Reflector - 1 Diode - Round - Red Lens # MCL0040RBB.
    view full answer...
    Image 1 for Image 2 for
  • Replacement Red Lens for 2-1/2" Round LED Optronics Marker Clearance Light With 1 Diode
    Yes, to replace the lens on your red Optronics LED Clearance or Side Marker Trailer Light w/ Reflector # MCL0040RBB you need the following: - Replacement Red Lens for Optronics LED Side Marker / Clearance Light # OPT79NR
    view full answer...
  • 2-1/2 Inch Diamter Clearance Lights For Camper
    SAE is not actually a part number, it just means it passed a safety test for Society of Automotive Engineers, which is likely why you were having trouble finding it. We have a plethora of 2-1/2 inch dimeter clearance lights, depending on if you need red or amber: - Red: Optronics LED Clearance or Side Marker Trailer Light # MCL0040RBB - Amber: Optronics LED Clearance or Side Marker Trailer Light # MCL0040ABB
    view full answer...
  • Does Optronics LED MCL0040RBB Need to be Replaced if Broken
    If your light is cracked, you will need to replace the fixture with the Optronics LED Clearance or Side Marker Trailer Light w/ Reflector - 1 Diode - Round - Red Lens # MCL0040RBB. Should you also need butt connectors to attach the wiring you can use the Deka Heat Shrink Butt Connectors # DW05744-5.
    view full answer...

Do you have a question about this Trailer Light?


Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Daron K
Edited by:
Daron K
Employee Brian T
Written by:
Brian T
Employee Noah M
Updated by:
Noah M

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