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Forget about swapping burned-out bulbs. This 3-1/2" round light uses a single LED that lasts up to 50 times longer than an incandescent bulb. At just 0.045 amps on a 12.8V system, it’s highly efficient while putting out a clean, bright red light. That means you get solid visibility and lower power draw with no fragile filaments to worry about.
Water damage can kill ordinary lights, but not this one. The housing and lens are sonically sealed into a single waterproof unit that keeps moisture out completely. Even if the trailer is submerged, the LED and circuit board stay protected so you can rely on it in wet or rough environments without worrying about corrosion or shorting out.
The install is straightforward thanks to the recessed mount and built-in flange design. It only needs a 2-3/4" diameter cutout, and the included foam gasket creates a tight, weather-resistant seal against the surface. The 2-wire pigtail with butt connectors keeps wiring simple—just connect power and ground, and it’s ready to go.
This light doubles as both illumination and a reflex reflector, so there’s no need to add a separate reflector for compliance or visibility. The integrated design keeps things clean while enhancing nighttime safety by making sure your trailer stays visible from behind or at an angle.
With a P2 rating, this light delivers a focused 90-degree beam pattern—45 degrees to either side of centerline—for clear visibility straight on. It’s perfect for use as either a side marker or clearance light, giving defined coverage where you need it most without lighting scatter or confusion.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Ellen: Hey everybody. I'm Ellen here at etrailer.com and we're taking a really quick look at the Optronics LED light for your trailer. This is going to give you a side marker light, as well as a rear light. It has the reflector, so other people can see what's going on with your trailer even at night. And then we'll have our two wires to connect for our power and ground. Then I see about these as they do already have the connectors installed.
They have some heat shrink butt connectors. These are for the 14 to 16 gauge wire. So the blue heat shrinks are usually for that size of wire. So you can just put in the wires to run into these guys, use a heat gun and shrink them down. And that'll give you a nice water-tight connection between those wires.
So kind of a nice improvement. It's nice they're already installed. So that's one less thing you got to worry about.As far as the size and dimensions, we'll take a look at all of that and make sure that this is the right size for you. Again, it is an LED light. So it's going to give you that clear side marker light for your vehicle.
You can use this as a side marker or clearance light since it's just P2 rated. That means it's only going to give you a 90 degree beam. So somebody can't see it from both directions. So if you wanted to have this to do both those functions or kind of put it on a corner so that people could see all the way around you, you'd actually have to get two lights to do that since you can only see it in that 90 degree view. And there's a pretty good diagram on our website here at etrailer.com that explains that a little bit more fully.It's just a single diode that gives you that light.
I'm going to hook this up to power and ground so you can see how bright that is. It's not going to be super bright or really illuminating a wide area. It's just going to be enough so that other people can see your trailer while you're out on the road with those lights on. So I'm going to get my little alligator clamps in there. Hopefully those will be long enough. There might be a little bit of flashing just because of my connection here. Since I'm just using these alligators clamps. Here we go. So I got to hold my power in to get it to turn on, but you can see that lights on there. And with the studio lights out, you can see just how bright that is. So again, not super bright, but enough that other drivers can see you and know where your trailer is.Put those off to the side. And then as far as measurements, the outside edge of the light is about three and a half inches in diameter. It does have this little kind of foam ground at the backs of that does help us to stay pretty water tight. We put this over here. The cutout this will need to fit into is about two and a half inches in diameter. We'll have three mounting holes, and those are spaced apart about two and three quarter inches apart center to center, going across that triangle there. It looks like about quarter inch hardware should work just fine for these. The connector or the wires coming off here, I'll give you a measurement of how much lead you get. Should be enough to get them connected up, but never a bad idea to know what you're working with. So it looks like you got about seven inches of wire to work with here.The lens and housing is made out of polycarbonate. Again, those are the LED, does make it a longer lasting bulb or longer lasting light than your typical incandescent light. Did we work better in all kinds of terrain and should last you longer and have less chance that you'll ever need to replace it unless that housing cracks, but polycarbonate it's usually pretty good at withstanding most impacts. As far as the reflector, again, you can see the light reflecting there. It is waterproof, has a sonically sealed housing. So you should be able to use this on just about any kind of application you'd want. It's a single diode. The power draw at 12.8 volts is 0.045 amps, and there is a lifetime warranty on the LED and it is DOT compliant.That's pretty much it for our look at the Optronics LED Clearance Marker or Side Marker light. I hope this has been helpful in deciding if this is the right one for you. We do have a lot of other options available here at etrailer.com. So check them out. Thanks for watching.
Ratings & Reviews

Rick
10/17/2026
They have held up well. These were installed on a 2007 motor home. The LED lights are a nice upgrade. Good product. No issues in the first year.


Phillip
5/14/2026
Optronics lights are still going strong!


Nick S.
9/15/2025
I will have to say this is a first! I have never seen these used in that way and it is the best thing I have seen all day! That is one of my favorite vehicles so I am glad they are working well and they look great.

Jess
10/7/2026
Still look great and work perfect. No fading on the lenses and bright as ever! Great choice.


Jess
10/7/2026
Still look great and work perfect. No fading on the lenses and bright as ever! Great choice.


Kashmar
5/25/2025
Side marker light is still going strong one year later! Great product

Brian
7/22/2026
Its just like the new one in our RV, same fit and finish, its like the manufacturer bought them from you!!

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Mike L.
1/29/2026
Thanks, Roy! I'm glad we could help!