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If your trailer ever gets dunked or sees a lot of wet roads, this round trailer light is built to handle it. The housing and lens are sonically sealed into one waterproof unit, keeping water out so the internal parts stay protected. It’s submersible, so you don’t have to worry about leaks or corrosion after launching at the ramp or driving through heavy rain. A foam mounting gasket adds another layer of protection, creating a tight seal when installed.
Good visibility is key for safety, and the P2-rated beam on this light gives 90 degrees of coverage—bright straight on with solid side awareness. The amber lens includes a built-in reflex reflector, so even when the bulb isn’t lit, it still bounces light back to keep your trailer noticeable at night or in low light. It works perfectly as either a clearance or side marker light, helping others see exactly where your trailer edges are.
Mounting this light doesn’t take much effort. The recessed design with a built-in amber flange gives a clean look and keeps the lens protected from bumps. It accepts an industry-standard 2-prong plug (sold separately), so wiring is straightforward without special connectors. The polycarbonate housing and lens hold up well against road debris and vibration.
Running at 12.8 volts, this incandescent light draws just 0.2 amps, making it easy on your electrical system while staying bright and consistent. At 3" overall diameter and only 3/4" deep, it fits neatly without sticking out. Backed by a limited 3-year warranty, it’s a dependable choice for keeping your trailer well lit trip after trip.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Today we're going to be taking a look at the Optronics Trailer Clearance or Side Marker Light with a Built-in Reflector. This is a round incandescent trailer light that serves as either a side marker light or a clearance light. It's going to feature a sonically sealed design, so when it comes to the housing, we're looking at a waterproof unit. It is submersible. It's going to feature the nice amber lens with the reflex reflector built in. That's made from a polycarbonite material.
When it comes to the lens and the housing, nice strong durable design. It is a recessed mount installation with a built in mounting flange. Your hardware is not included. It is going to require three screws to get the unit installed. It does come with a foam gasket to create a nice weather tight connection point, or a weather tight seal at the mounting location. When it comes to hooking up your wiring to it, it's going to accept an industry standard two prong plug.
That item is sold separately. If you're in need of something like that , you can check out some options here at etrailer.com. This is a P2 rated light that's SAE and Department of Transportation compliant. If you take the measurement of the actual diameter of the light, that's the center area here, that's going to give us a measurement of around two inches. Overall diameter from edge to edge is going to measure around three inches. Then it's going to have a depth, or a thickness, of about 3/4 of an inch from this point here to the top of the light.
The mount holes on the unit, those are separated on center by 2 1/4 inches. When it comes to the power draw at 12.8 volts, it's going to be 0.2 amps. We're going to go and hook it up to our external power source. That way you can see what it looks like with power running to it. We'll also be able to turn off our overhead light so you can see it in a low light setting. The two prong plug simply lines up with the connection points and pushes together.
Creates a nice tight seal. You can see here that the light send out a really nice consistent signal. It's going to contain one incandescent bulb. This just gives you a good look at right here at the center it has a clear space, so the reflector does not cover the center. That allows plenty of light to come through and then everywhere else on the lens itself, it's going to have that built in reflex reflector. That's going to do it for today's look at the Optronics Trailer Clearance or Side Marker Light with the Built-in Reflector.
Ratings & Reviews
Louis
8/30/2026
Great
Jerred H.
8/30/2026
Susan
11/11/2025
This marker light is still working. I have no complaints.
Info for this part was:
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Christopher H.
10/1/2026
Glad this worked well for you Al! Appreciate you including the photo.