If your trailer ever hits wet roads or the ramp, this light is built to handle it. The single red LED and polycarbonate housing are completely sealed for waterproof performance. It’s rated as submersible, so moisture and dust stay out, keeping your tail, brake, and turn signals working in all weather. You get dependable lighting without worrying about leaks or corrosion.
Electrical problems from water intrusion are a thing of the past with this setup. The light connects using a weathertight plug that blocks moisture from getting into the wiring. It’s designed for a clean, secure fit with the AL45PWTB adapter (sold separately) to match standard 3-prong plugs. Once it’s connected, the seal keeps your wiring protected for the long run.

Forget about swapping bulbs or drawing too much power. This round 4-1/8" diameter light uses a single LED that draws only 0.25 amps for stop/turn and 0.007 amps for tail functions at 12.8V. It’s more efficient than incandescent lights and built to last, with a lifetime warranty on the LED itself and a 3-year warranty on the housing and lens.
Getting that clean factory look is easy with this recessed-mount design. The light fits into a grommet (A45GB – sold separately) for a snug, finished appearance that sits flush with your trailer body. If cutting a hole isn’t an option, you can use the BK45BB bracket (sold separately) to mount it externally while still using the same grommet. Either way, it fits solidly and looks sharp once installed.
You don’t have to second-guess visibility or compliance on the highway. This light meets DOT, FMVSS 108, and CMVSS 108 standards, so it delivers the correct brightness and signal function every time you hit the brakes or make a turn. It’s built to perform safely under real-world conditions mile after mile.

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Today we're going to be reviewing part number STL003RMB. This is the ONE Series, Submersible LED Trailer Light from Optronics. The round trailer taillight 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 a sonically-sealed waterproof housing, as well as a lens unit, so it is submersible. The ONE Series provides bright light using fewer diodes when compared to other LED lights. It features durable surface mount technology when it comes to the construction of the LED circuit board.
What that means is it's going to better withstand shock and vibration, and it's going to allow for improved heat distribution. LED systems are going to make great replacements for incandescent lights. They're going to last about 50 times longer, they're going to be much more efficient, and you don't have to worry about replacing bulbs, or burned out filaments. When it comes to the lens and the housing, it's made from a polycarbonate construction. It's going to have the nice red lens with the white housing. This is designed to be a recessed mount installation, with a mounting grommet, and hardware.
Those items are sold separately, you can find those here on our website. The plug here on the back is designed as a weather tight connection point. It's going to require adapter part number AL45PWTB. That part is sold separately, and it is required to work with an industry standard 3-prong plug. This light is Department of Transportation compliant. It meets FMVSS108 requirements and CMVSS108 requirements for automotive lighting. We're going to take a measurement of the diameter, that's going to give us a measurement of about 4 inches.
Optronics is going to put a lifetime warranty on the LEDs. That adapter that I mentioned is going to look like this. It plugs into the plug here on the back, again, this is going to be sold separately, and it snaps into place for a nice tight, secure connection. Now we can go ahead and hook up our 3-prong plug. Then we'll be able to turn off our overhead lights. You can see here it sends out a really nice consistent signal.
This is going to be the taillight function, and then when we apply our brakes, you can see how the light brightens up. It's going to do that same function when we apply our turn signal. That's going to do it for today's review of part number STL003RMB. This is ONE Series Submersible LED Trailer Light from Optronics. .
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