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This square clearance and side marker light keeps things simple and effective. At just 2-3/4" long, 2-1/8" wide, and 1" deep, it fits neatly on most trailer surfaces without taking up extra space. The red lens is reflectorized, so you don’t need a separate reflector for DOT compliance. It functions as both a clearance and side marker light, giving your trailer consistent visibility in a small, sturdy form factor.
The molded plastic housing and durable lens guard against corrosion and weathering, keeping it dependable in the long run. When maintenance is needed, both the lens and the single incandescent bulb are replaceable—no need to toss the whole unit. That simple design makes it easy to keep your lighting system working like new.
Wiring doesn’t get much easier than this. The light uses an 18-gauge single lead wire for power and grounds directly through its mounting stud. That means fewer connections to worry about and a clean look once it’s mounted. It’s a simple, proven setup that just works.
Safety lighting shouldn’t require extra parts. This light’s built-in reflectorized lens meets DOT requirements on its own, eliminating the need for a separate reflector. It’s an efficient way to stay compliant while keeping your trailer lighting clean and functional.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hello everybody, this is Jeff at etrailer.com. Today, we're gonna take a look at this Optronics Red Square Trailer and Clearance Side Marker Light with the Reflector. Now, this red square light can be used as a clearance or a side marker light, and also the red lens used on this as reflectorized, meaning that our separate reflector is not needed for DOT compliance. The measurements on this light, just to give you an idea of the length, two and three quarter inches long, the width two and one eighth inches wide, and the depth of it is only one inch deep. Now, this light does feature replaceable screw down lens and an easy to replace incandescent bulb. If you notice in the back, it has a single lead wire for power, and it grounds through the mounting stud.
Now, I do wanna hook this up to some 12-volt power, just to show you how bright the light is. So we're gonna go ahead and take our power wire, and we'll go ahead and hook that up to the single wire lead. And as we mentioned, we're gonna ground it through the stud back here. So with it all hooked up, we'll go ahead and turn our power on, and you'll be able to see the light come on. And then I'm gonna go ahead and turn off the overhead light, and you can see the incandescent bulb lit up, shows you how bright the light is.
Go ahead and turn back on our overhead lights. Go ahead and turn off our power. Now, there's a molded plastic housing and a nice durable lens, which provides all-weather protection against corrosion. Now, on the manufacturer's cross reference, this slide will work as an exact replacement for the Uni Bond, part number MR2020R, the Wesbar, part number 3103, and the Peterson, part number 114R. But that should do it for the review on this Optronics Red Square Trailer and Clearance Side Marker Light with the Reflector.
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Customer Satisfaction Score:
100% were satisfied with this product
0% of customers were not satisfied
Ratings & Reviews
To L.
8/25/2018
Lights still working great
Bruce
11/11/2023
Working great - just have a problem with people crushing them when they load the trailer with their big tractor tires
Jshoe
8/18/2014
Still very happy with the product.
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Jay S.
2/20/2015
Well actually I sold the trailer that I originally bought them for. But I had ordered extra and they will fit new trailer just fine. A very nice product for the price.