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Optronics LED Trailer Clearance or Side Marker Light - Submersible - 8 Diodes - Beehive - Red Lens
Optronics

Optronics LED Trailer Clearance or Side Marker Light - Submersible - 8 Diodes - Beehive - Red Lens

Part Number: MCL21RB
In Stock
$21.34
Trailer Lights
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2" Diameter beehive. Waterproof, LED trailer light serves as a clearance or side marker light when properly mounted. Durable polycarbonate housing. Mounts to trailer with grommet (not included). Accepts standard 2-prong plug. P2 rated. Great Prices for the best trailer lights from Optronics. Optronics LED Trailer Clearance or Side Marker Light - Submersible - 8 Diodes - Beehive - Red Lens part number MCL21RB can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Optronics Trailer Lights - MCL21RB

Highlights

  • Reliable In Any Weather: Sonically sealed, waterproof housing keeps out moisture and debris.
  • Fewer Replacements Needed: LEDs last 50 times longer and use less power than bulbs.
  • Bright, Low-Draw Light: 8-diode design pulls only 0.061 amps at 12.8 V for clear visibility.
  • Simple Plug-In Setup: Uses standard 2-prong connector for quick, tool-free install.
  • One Light, Two Uses: Works as clearance or side marker when properly mounted.
  • Compact Fit: 2? diameter by 1-3/4? tall recessed beehive shape suits tight spaces.

Features to know about

Brighter and More Efficient Lighting: 8-Diode LED Design

Older incandescent lights burn out fast and pull more power than they should. This 2" beehive-style light uses 8 LEDs that last up to 50 times longer and draw only 0.061 amps at 12.8V. That means less strain on your electrical system and no bulbs to swap out later. The bright, red lens delivers clear illumination while keeping current draw low—perfect for improving visibility and efficiency.

Built for the Elements: Sonically Sealed and Submersible

Water and vibration are no threat here. The housing and lens are sonically sealed into one solid piece, making it waterproof and fully submersible. Whether the light ends up on a boat trailer or in constant rain, the sealed design keeps moisture out so the circuit board and diodes stay protected and working like new.

Simple, Reliable Installation: Standard 2-Prong Plug and Grommet Mount

Installing this light doesn’t take any special tools or wiring tricks. It mounts flush or recessed using a grommet (sold separately) and connects with a standard 2-prong plug. Once it’s in place, it stays put with a clean, tight fit. That straightforward setup makes it easy to upgrade or replace an existing marker without hassle.

Durable Construction for Long-Term Use: Polycarbonate Housing

The durable polycarbonate housing stands up to road debris, UV exposure, and daily wear. It’s tough enough for heavy use yet lightweight, so it won’t crack or fade easily over time. You get a dependable light that keeps its shape and clarity even after long hours on the road.

Focused Visibility Where You Need It: P2-Rated Beam Pattern

For clearance or side marker use, this P2-rated light shines precisely where needed with a 90-degree total beam spread—45 degrees to each side of centerline. It’s visible straight on for clear signaling but tailored so it doesn’t glare from every angle. That focused pattern makes it ideal as part of a wider lighting setup that meets visibility standards safely and effectively.

Specs

Dimensions

  • Diameter: 2"
  • Height: 1-3/4" tall

Dimensional diagram of Optronics MCL21RB 2-inch red beehive LED trailer clearance and side marker light showing height and diameter measurements.

Electrical

  • Power draw at 12.8V: 0.061 amps
  • Diodes: 8

Warranty

  • Lifetime warranty: LEDs

Manufacturer Cross Reference

  • Uni Bond #: LED7200R
  • Grote #: G3092
  • Peterson #: M166R
  • Maxxima #: M30210R

MCL21RB Optronics LED Trailer Clearance or Side Marker Light - Submersible - 8 Diodes - 2" Beehive - Red Lens - P2 Rated

Alternate part number: MCL-21RB





Customer Satisfaction Score:

Ratings & Reviews

4.8

3107 reviews
5 Stars
(2702)
4 Stars
(270)
3 Stars
(57)
2 Stars
(21)
1 Star
(57)
Review sort icon
2" Diameter beehive. Waterproof, LED trailer light serves as a clearance or side marker light when properly mounted. Durable polycarbonate housing. Mounts to trailer with grommet (not included). Accepts standard 2-prong plug. P2 rated.

by:

Perfect fit, very easy to install. Shipped quickly.



by:

Working with your Staff has been wonderful and your products are great and readable priced.
Ed Sheridan



by:

Good service, great products, good product life! Very pleased with everything I bought from you. Best prices too!



by:

Fit perfect

Daniel D. profile picture

Daniel D.

6/6/2023

It works perfect for my needs I use it to haul my classic cars and have moved some other large heavy objects

Mike L. profile picture
Etrailer Expert

Mike L.

7/6/2023

@DanielD Awesome! We're glad to hear that the # MCL21RB Optronics beehive-style clearance lamp worked well for you...


by:

Works great. Looks just like the origi nal.

Jeff profile picture

Jeff

11/13/2022

Still working great



by:

Hi. I’m surprised how quick was delivered my order highly recommend this particular store thanks.



by:

Exactly what I needed l, but I feel like the price was extremely too expensive.



by:

The beehive lights work great. Fast shipping and the good folks to deal with.



by:

Great communication & follow up! Quick shipping. World class!!! Definitely have website saved to favorites for future needs. .



by:

Excellent transaction. Quick shipping, and exactly what was needed!



by:

Easy ordering! Quick shipping! Received my order today! Just as I ordered! Thank you for great service and follow-up !



by:

Exact replacement beehive bulb for my Gatormade trailer. etrailer is a good company to do business with.



by:

Matches the broken one on my Trailer. It is a little bit hard to install, but worked out just fine.

Michael Z. profile picture

Michael Z.

2/18/2024

They are still working great. They fit perfect when I installed the new lights.



by:

These look great, and are of very high quality.

CAUTION:
No where in the description does it indicate that these DO NOT include any way of mounting them. If you don't have an existing mounting bracket and pigtail (as was my case) they arrive and then you realize you can't get your project done because you need more parts.

Get the parts you need, and these are great.



by:

photos of finished projectslights installed



by:

Repeat customer here and always satisfied with product quality, prices and fast shipping. The side marker lights I ordered were exact fit for my snowmobile trailer. Thanks again!



by:

Perfect replacement fit. But better than that was the help I received from etrailer to find the exact replacement lights I needed. A big Thank You for that!



by:

I wanted to replace my incandescent lights with LEDs, for the rear sides I went with the beehive style now I can see the rear corners of my trailer.
These lights are good quality and look great.
Don't be fooled by the cheap knock offs out there.



by:

A year later and it still works great



by:

Bright plug right in fits dimension as said. Good product



by:

Was the exact one I needed, working gre at.



by:

Great product. Easy installation and compatible with O.E. Working very well.
My only complaint is with U.S.P.S. Extremely slow delivery.



by:

Good product



by:

Web page user friendly. Check out extremely easy. Delivery was faster than I expected.



by:

Replacement light that works correctly

Bill profile picture

Bill

2/2/2026

Great replacement

Andrew N. profile picture
Etrailer Expert

Andrew N.

2/2/2026

@Bill That's great to hear!

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Info for this part was:

Employee Patrick B
Video Edited:
Patrick B
Employee Laura H
Updated by:
Laura H
Employee Brian T
Updated by:
Brian T
Employee Cole B
Installed by:
Cole B

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