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This 4-5/16" round Optronics LED trailer light puts out a clean, bright red glow that outshines and outlasts old incandescent bulbs. The LED setup handles all three functions—brake, tail, and turn—without drawing much power. At 12.8 volts, it only pulls 0.16 amps for stop and turn signals and just 0.008 amps for tail lights. It’s more efficient, more durable, and comes with a lifetime warranty on the LEDs, so you won’t be dealing with burnt-out bulbs again.
Wet conditions aren’t a problem for this light. It’s completely sealed with a waterproof design that keeps moisture out even when submerged, making it a solid choice for trailers that see the ramp or rainy roads. The polycarbonate lens and housing hold up against wear and corrosion, keeping the light working and looking good long-term.
Loose or corroded wiring can be a real headache, but this light’s weathertight connector keeps everything sealed up tight. It’s built to block out moisture and dirt for consistent power delivery. It comes with a pigtail ready to hardwire to your trailer, or you can use the AL45PWTB adapter (sold separately) to connect it to standard 3-prong plugs.
Whether you prefer a clean recessed mount or a surface setup, this light gives you options. It installs easily in a grommet (A45GB – sold separately) for a flush finish or pairs with an optional bracket (BK45BB – sold separately) if you’d rather not cut into your trailer body. Either way, the fit is solid and professional-looking once installed.
Safety compliance is built right in. This light meets all DOT, FMVSS 108, and CMVSS 108 requirements for brake, tail, and turn lights—so you can tow knowing your setup is road-legal and highly visible day or night.
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 part number S T L four one three R M B. This is the Optronics LED trailer light. The round trailer light is going to serve three functions. It's going to function as your stop light, your tail light, and your turn signal light. It's going to feature the sonically sealed water proof housing and lindge unit, so this trailer light is submersable. LED's are going to make great replacements for incandescent lights, they're going to last a lot longer.
They're going to be more efficient, and you don't have worry about replacing the bulbs, and you don't have to worry about brittle filaments. We're going to have the polycarbinate red lens and the polycarbinate white housing, very strong and durable. This is designed to be a recess mount installation with a mounting grommet. Your mounting grommet is sold separately. Here on the back side we have the weather tight connection point. This does require an adapter, part number A L four five P W T B, that is sold separately. That is required in order to work with an industry standard three prong plug.
The light is department of transportation compliant. We're going to take a few measurements real quick, starting with the overall diameter. That's going to give us a measurement of about four and five sixteenths of an inch. If we measure the depth, that's going to give us a measurement of about eleven sixteenths of an inch. If we take a look at the depth, including the plug here on the back, that's going to give us a measurement of about one and five eighths of an inch. Now, this lights going to contain four diodes or four LED's. It's going to have a power droll of twelve point eight volts.
For the stop and turn lights it has zero point one six zero amps. For the tail lights, zero point zero zero eight amps. Optronics is going to put a lifetime warranty on our LED's, we're going to go and hook it up to our external power supply, that way you can see what it looks like with power running to it. So here's what the plus looks like that goes with it. Plug it in, it snaps in there for a nice, tight, secure connection. So you can see here, it sends out a nice, strong, consistent signal.
It's going to have four LED's, this is going to be the tail light function when we apply our brakes. You see how that illuminates for a stronger signal output, and it's going to function the same way when we activate our turn signal. That's going to do it for today's review, part number S T L four one three R M B.
Ratings & Reviews
Victoria H.
3/8/2025
So glad to hear these worked out perfectly for you and they look good too, Steve!
Bob
2/18/2026
Evidently just fine. I traded my camper in on a new one and it was just fine during the inspection.
Michael B.
7/8/2020
Still happy with the lights. Have not had any problems with them whatsoever
Paul S.
2/19/2017
Fantastic....no problem at all.
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Jesse M.
9/10/2026
Pratiquement tous les feux arrière à DEL enfichables Optronics ont la prise décalée sur un côté. Quel était le numéro de pièce du feu que vous remplaciez? Pretty much all of the Optronics plug-in LED tail lights have the plug offset to one side. What was the part number of the light you were replacing?