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Switching to LEDs means better visibility without taxing your electrical system. This amber Optronics clearance or side marker light uses six white LEDs behind an amber lens to produce a clean, bright glow. At 12.8V it only draws 0.057 amps, so you get strong light output while keeping power use minimal. And because LEDs last up to 50 times longer than incandescent bulbs, you won’t be dealing with brittle filaments or constant bulb swaps.
If your trailer sees water or rough weather, this light is built to handle it. The polycarbonate housing and lens are sonically sealed into a single waterproof unit, keeping moisture from reaching the diodes or circuit board. Whether it’s rain or full submersion, the sealed design protects the internals and keeps the light shining.
Getting it mounted is straightforward. The light surface mounts with 3" center-to-center hole spacing (hardware not included) and uses a simple two-wire setup—one lead for power and one for ground. At 4" long, 1" wide, and 1-3/16" thick, it fits easily onto most flat surfaces for a clean look that stays put.
This light’s P2 rating gives you a 90-degree total beam spread—45 degrees to either side of center. That means it works perfectly as a clearance or side marker light when positioned correctly, providing bright, direct visibility that meets DOT standards for safety.
The lens and housing are made from impact-resistant polycarbonate that holds up to vibration, road debris, and UV exposure. It’s the kind of setup you can install once and rely on for years, backed by a lifetime warranty on the LEDs.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
This is Optronics Thin Line LED Trailer Clearance Light, part number MCL66AB. This light is sealed and waterproof, so it is safe to use on boat or jet ski trailers. Inside are 6 LEDs that draw a total of .048 amps at 12.8 volts. It is designed to surface mount to your trailer using mounting holes that are 3 inches on center. On the back of the light are your 2 wire leads. The white wire lead with an eye-ring terminal for ground and the black lead for power. Next, we will hook up the light to a power source, so you can see how it looks. We will connect the white to our ground and we will connect the black to our power. Next, we will turn off the overhead lights, so you can see how bright it is. And that is it for Optronics Thin Line LED Trailer Clearance Light, part number MCL66AB.
Customer Satisfaction Score:
99% were satisfied with this product
1% of customers were not satisfied
Ratings & Reviews
Mike
4/5/2018
Very nice, being waterproof and they are more than bright enough also. It was a good investment compared to the standard bulb kind that were on the camper by far.
Tom H.
4/19/2016
Great. Couldnt be happier. Still like new and saltwater is incredibly corrosive.
Reginald
10/30/2017
Still working great.
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Brooke M.
4/14/2025
Your review with the picture lit up my night! Thanks for sharing a photo and for the kind words :)