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Miro-Flex LED Clearance or Side Marker Light w/ Chrome Bezel - Submerisble - 3 Diodes - Red Lens

Miro-Flex LED Clearance or Side Marker Light w/ Chrome Bezel - Submerisble - 3 Diodes - Red Lens

Item # MCL17RB
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MCL17RB - Oval Optronics Trailer Lights
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4-3/16" x 1-3/8" Oval. Waterproof, LED trailer light serves as either a side marker light or clearance light. Miro-flex reflector increases light output. Surface mount - hardware not included. 2-Wire design. P2 rated. Lowest Prices for the best trailer lights from Optronics. Miro-Flex LED Clearance or Side Marker Light w/ Chrome Bezel - Submerisble - 3 Diodes - Red Lens part number MCL17RB can be ordered online at or call 1-636-306-4830 for expert service.
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Optronics Trailer Lights - MCL17RB

  • Clearance Lights
  • Oval
  • LED Light
  • Red
  • 4L x 1-1/2W Inch
  • Surface Mount
  • Rear Clearance
  • Side Marker
  • Submersible Lights
  • Optronics

4-3/16" x 1-3/8" Oval. Waterproof, LED trailer light serves as either a side marker light or clearance light. Miro-flex reflector increases light output. Surface mount - hardware not included. 2-Wire design. P2 rated.


  • Oval LED trailer light functions as a clearance light or a side marker when properly mounted
  • Miro-flex faceted reflector provides increased light output with contemporary appearance
  • Sonically sealed, waterproof housing and lens unit is submersible
  • LEDs make great replacements for incandescent lights
    • Last 50 times longer
    • More efficient - provide brighter light with less power output
    • No bulbs to replace - no brittle filaments
  • Snap-on chrome bezel provides a finished look
  • Red lens over white LEDs
  • Compatible with 12V DC electrical systems
  • Surface mounts to trailer - hardware not included
  • 2-Wire design incudes power lead and ground wire
  • DOT compliant
  • P2 rated


  • Dimensions: 4-3/16" long x 1-3/8" wide x 3/4" thick
  • Distance between mounting holes (center on center): 3-1/8"
  • Diodes: 3
  • Power draw at 12.8V: 0.047 amps
  • Lifetime warranty on LEDs

Optronics MCL17 Series Miro-Flex LED Marker Clearance Light with Chrome Bezel Dimensions

Sonically Sealed, Waterproof Trailer Light

The waterproof construction of this light makes it ideal for use on trailers that may be submerged, like a boat trailer. The housing and lens are sonically sealed together to create a single unit, which means that water will not get into the light and damage the diodes or circuit board.

P2-Rated Lights

Diagram of light spread for P2 rated light

A P2-rated light produces a 45-degree angle of light to either side of its centerline for a total of 90 degrees of coverage. This beam pattern can be seen straight on, but it cannot be seen clearly from the side. So this type of light can be used as either a side marker light or a clearance light, but it cannot function as both. If you need both functions, then you must install 2 separate lights on your trailer - one as a front or rear clearance light and one as a side marker light.

MCL17RB Optronics Miro-Flex LED Clearance or Side Marker Trailer Light w/ Chrome Bezel - Submerisble - 3 Diodes - Oval - Red Lens - P2 Rated

Alternate part number: MCL-17RB

California residents: click here

Customer Reviews

Miro-Flex LED Clearance or Side Marker Light w/ Chrome Bezel - Submerisble - 3 Diodes - Red Lens - MCL17RB

Average Customer Rating:  4.8 out of 5 stars   (1392 Customer Reviews)

4-3/16" x 1-3/8" Oval. Waterproof, LED trailer light serves as either a side marker light or clearance light. Miro-flex reflector increases light output. Surface mount - hardware not included. 2-Wire design. P2 rated.


Order what I thought was similar lights for my flatbed but was very wrong. These lights here are some of the best quality and exact fit and bright lights on the market. Definitely will continue to receive my business!!!

One light turned into 9! These lights are worth every penny! Good quality and very bright. I have them on my cm flatbed and couldn’t be happier. Definitely gonna be my go to light from here on out!
Derek - 06/30/2022


This fixture was the exact replacement for my 2011 Trailmanor 2720 trailer. The manufacturer had moved to a more modern looking fixture. I was even able to use the old chrome piece from the old fixture to keep a uniform age look. I installed a wireless rearview camera and needed a new fixture and its longer wires to make everything work. May look a little strange, but it works like a charm. E-Trailer service was excellent as usual.

The fixture is still hanging in there. No issues.
Matt C - 07/06/2020


These side markers (both red and amber LED) are great for my 12' trailer. They have 3 LEDs (you can also get 4), and their size is perfect for a small trailer. The LED's are really bright, not only at night, but also during the day, so they are easily seen. I especially like the fact that they are sealed, so there should be no water intrusion problems in the future. I have included a few pictures, the first showing the round LED brake/turn/running/reverse lights (that I had purchased earlier from etrailer) with the red side marker mounted vertically on the outside. The second shows a side view of the red side marker light, and the 3rd picture shows the side marker mounted to a small piece of 1" X 1" x 1/8" aluminum angle which I painted black to match the mounting frame of the round LED lights. I mounted the LED side marker to one leg of the aluminum angle, then mounted the other leg with 1" standoffs to two holes already present on the black mounting frame of the round LED light. Although all the lights are sealed against water intrusion, I decided to mount them on each side of the trailer at the top of 2 PVC pipes, about 36" long each, where the lights would not be exposed to immersing in water when launching/retrieving a boat.

After a year, the lights are still bright as ever. One of them even survived being drug down the highway for 100 yards when the PVC pole it was mounted to came out of its holding fixture!!
RON S - 08/05/2018


Great product, it matched the rest of my lights on my toy hauler and is working great.


These bright and waterproof little lights are wonderful. They draw only .5 watts (ie so little they will probably not make a difference to any auto, RV etc lighting circuit). I used them to enhance the dim stop and turn signal on my RV. The plastic lens were fogged and the voltage kind of low (a 40' RV has a lot of voltage drops) but these little LEDs shine bright and were a LOT cheaper than trying to replace the existing fixtures. I just wired them in parallel with the existing light bulb. So now I have a bright stop light and a built-in spare (the existing bulb could burn out and the LED will keep working). The photo shows how I did it


Excellent light no problems after a year

no problems at all
Gary - 06/30/2022


Reordered this product when needed a new side marker as it was perfect! Product was delayed and customer service kept me updated as the wait continued. Product was well worth the wait and it was nice that they cared enough to keep me in the loop!


Needed a rear clearance light for our 2016 Tiffin 40AH Phaeton and gave excellent service, fast shipping and the product was as described and worked perfectly.

by: 03/02/2022

Package arrived today, I installed the light right away, everything went well, see pics...


The clearance light was an exact fit. The package arrived quicker than I anticipated. Great Job etrailer!


Shipping was fast, lights were easy to install and look great, really bright at night. The "bling" to top off paint-n-seal update we are in the process of doing on our 1983 travel trailer. The new LED's make the camper look good, friends thought we got a new one. Highly recommend them.


They look like what was on the motorhome, exact re.


Nice looking tail light that I used to replace faded upper clearance lights on the rear of the fifth wheel. Excellent fit.


Very well made and perfect match


Great product, terrible packing. All loose and banging into each other. No bags on each light. 3 out of 5 had a loose bag with end cut off.


It might be possible to give 5 stars but after purchasing all the products about a year ago, my little fiberglass trailer is not even close to being ready. All the lighting is hooked up and they all seem to work, so that's a good thing. The other products that I purchased have not been installed yet.
I would like to mention how pleased I am with e-trailer videos showing everyone how their products look and how they're used. Keep it up, I am a happy customer.



Look exactly like the photo and very nice looking lights , I am very pleased with there appearance and really improves the look of my horse trailer

They look and work like the day I got them still very pleased
Donald - 09/05/2020


Eady Install, good look


Great service and delivered 3 days early!
ordered parts from etrailer several times and ALWAYS had good results
The parts I ordered this time was cheaper than ANY other web site and fast delivery
I live in rural Montana so can't get some parts local
I recommend etrailer every time




These guys Rock! Ordered one day and 2 days later I had them. Could hardly have driven to town and tried to locate the lights myself before these arrived.
Great lights! Look good, and easy to install.


Had to Oder an amber so just got the red for spares I have them on my horse trailer and love them they are very bright


Great light, Lifetime warranty easy install. I had one go out on my 2014 Forest River so 1 ordered a few of each color just incase I had on burn out while I was one the road. Now what's funny. Our station just took delivery of a new 2016 Horton Medic truck and low and behold we have the same lights on our truck.


These lights are on our 2015 Forest River toy hauler. Not all dealers have them, so I ordered two of each color to have as spares. They are exact replacements and work perfectly. Glad I found etrailer.


Took me a while to find an item exact replacement for my marker lights. Finally found them on etrailer and they stocked every light on my toy hauler. Thanks for being there.

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • Which Wire is the Ground and Which is Power Wire on LED Clearance Light, part # MCL17RB
    The item you selected, LED Marker Clearance ID Light, part # MCL17RB, can use either wire as the ground or power wire. Each wire goes to the diode in the LED, so it does not matter which wire is the ground wire or power wire.
    view full answer...
  • Should I Unplug My 7-Way When Raising my Dump Trailer
    I would recommend you unplug the 7-way before you activate the dump feature of your trailer. A lot of times if you leave the 7-way plugged in while dumping your trailer it will short out the 12 volt accessory circuit.
    view full answer...
  • Troubleshooting Trailer Electrical/Brake Controller Problem on Trailer Towed by 1999 Chevy Suburban
    Have you tried towing the dump trailer with a different vehicle? This would pretty quickly tell you if the problem exists with the tow vehicle or the trailer wiring. If the trailer does the same thing with a different tow vehicle, then you know the problem lies in the trailer wiring. At first glimpse, I'd be inclined to think that the problem you're having lies in the way the trailer connector on the trailer is wired. Please refer to the trailer wiring FAQ article I've provided to confirm...
    view full answer...
  • Dump Trailer Battery Goes Dead Very Quickly
    I'd recommend checking the wiring of your break away system if you you're using your main trailer battery to power it. A short in that system could certainly drain down the battery over time. I've linked you to a help article that explains how a break away system should be installed.
    view full answer...
  • Why is There a Price Change Between Clearance Lights When Lens Color is Different?
    The Miro-Flex LED Clearance or Side Maker Light w/ Chrome Bezel - Submersible - 4 Diodes - Red Lens # MCL19RB and Amber Lens # MCL19AB prices change as the manufacturer determines. This is sometimes a material cost and other times is the basic supply and demand equation that doesn't have an easy formula. You may want to also consider the Miro-Flex LED Clearance or Side Marker Light w/ Chrome Bezel - Submerisble - 3 Diodes - Red Lens # MCL17RB and Amber Lens # MCL17AB for a similar look...
    view full answer...
  • Can a Trailer Battery On a Dump Trailer Be Charged Using The 7-Way Trailer Connector
    First, a trailer battery cannot be charged up from the 12 volt circuit on a 7-Way connector. The 7-Way can only provide a maintenance charge which will keep the battery at is current charge level. It is possible that the battery is back feeding when the truck is turned off and the trailer is still connected. You may also need to increase the size of the wiring. Wiring that is too small a gauge may not be able to handle the power draw. A short circuit or corrosion in the trailer connectors...
    view full answer...
  • Can a Trailer Battery On Dump Trailer Be Charged Using The 7-Way Trailer Connector
    The issue is that trailer wiring is too small and vehicle alternators are rarely strong enough to push back the amperage needed to charge up a trailer mounted battery (unless it is a small breakaway system battery). The amount of power sent back is only enough to keep the battery at the level of charge it is currently at. Having the 12 volt circuit connected to a 12 volt trailer battery will not over charge it because it cannot charge it up so no worries there. When you have access to...
    view full answer...
  • Battery Solenoid Recommendation for a Trailer Battery Charge Wire to Prevent Battery Drainage
    We have a solenoid that will do exactly what you are trying to do. You would want a Tow Ready Battery Isolation Solenoid # TR118665. You would run the keyed power source to the middle terminal and then splice the other terminals inline with your 12 volt power charge circuit. In order to find a good circuit to use I would recommend you find an accessory that only gets activated when the key is on and then tap into the power side of that circuit. On my car I used the power antenna wire and...
    view full answer...
  • Charging 4 Deep Cycle Batteries Running a Power Inverter with Fridge Plugged in While Traveling
    What you can do is connect the batteries that power the inverter directly to the starter battery on the truck or even an alternator in your 2018 Ford F-450. Keep in mind though that when multiple batteries are connected together it takes a long time to charge all of them up. Instead of using the batteries you could attach the inverter directly to one of the truck batteries so that it will get constant power without depleting the truck batteries. This will allow you to keep your 4 deep...
    view full answer...
  • Replacement Trailer Clearance Lights for GloBrite 122r/122y
    The globrite 122 in red or yellow/amber are 3.75 inches by 1.70 inches from what I can find online. We do not have a direct replacement, however the closest dimension we have to replace them is 3-1/2 by 1 inch. I recommend the # MC68RB and # MC68AB. If you want to go larger, then I recommend the 4x 1-1/2 inch LED # MCL17RB and # MCL17AB.
    view full answer...
    Image 1 for
  • Replacement Trailer Clearance Lights for GloBrite 122r/122y
    The globrite 122 in red or yellow/amber are 3.75 inches by 1.70 inches from what I can find online. We do not have a direct replacement, however the closest dimension we have to replace them is 3-1/2 by 1 inch. I recommend the # MC68RB and # MC68AB. If you want to go larger, then I recommend the 4x 1-1/2 inch LED # MCL17RB and # MCL17AB.
    view full answer...
    Image 1 for
  • Using a Trailer Tail Light on a Cargo Carrier
    A clearance light like # MCL17RB will not provide you the separate running, brake, and turn functions. It will stay on all the time your running lights are on. Another option instead is to use a strip light like # STL59RB. It will provide all of the functions however if you just install one it will flash regardless of which turn signal you're using. You can install two, one on each side of the cargo carrier if you'd like. You'll also need to install a 4-way connector on the carrier...
    view full answer...
  • How to Prevent Trailer Dump Battery Overcharging From Truck Battery
    The 12-volt accessory power circuit from your 7-way trailer connector is limited in how much power it can deliver to your dump trailer's battery by the alternator's output and the small gauge wire that's typically used to power the circuit as well as the distance that the power must travel. The accessory circuit can be used to maintain a charged battery, but it does not have enough grunt to charge the battery once it's been discharged. Using shore power and a battery charger like the...
    view full answer...
  • Using 7-Way Trailer Connector 12-Volt Accessory Circuit to Maintain Battery on Dump Trailer
    If you have read our previous responses regarding the use of the 12-volt accessory circuit from the 7-way, then you know that the circuit can be used to maintain, but not charge a depleted trailer-mounted battery. We typically recommend using a battery charger like the # CTEK56353 CTEK Universal Battery Charger to recharge a depleted battery. The 12-volt accessory circuit should already be fused (or if the 7-way was installed aftermarket, protected by a 40 amp inline circuit breaker like...
    view full answer...
  • How To Charge Trailer Battery On Dump Trailer Using The 7-Way Trailer Connector
    You can provide a maintenance charge to the trailer mounted battery on your trailer via the 7-Way trailer connector's 12 volt circuit. But the wiring in that circuit is too small to handle the amount of amperage needed to charge up the battery. It is also possible that the alternator on the truck is not strong enough to push back that much amperage even with a larger wire gauge. So if you connect a wire from the 12 volt circuit to the battery on the trailer it will provide a maintenance...
    view full answer...
  • Dump Trailer Battery Does Not Stay Charged
    There might be something in the wiring that is damaged or pinched causing a short that is discharging the battery. Inspect the wiring and fix any problem areas. Also make sure that the vehicle and trailer side connectors are clean and free of corrosion inside where the wires attach and outside on the pins. At best trailer wiring can provide a maintenance charge to a trailer mounted battery but it can't charge up the battery. This is because the wiring is too small and most vehicle alternators...
    view full answer...
  • Trailer Safety Chain Connection to 2015 GMC 2500 with the 2.5" Hitch
    That is becoming a problem with more and more trucks these days. Some folks like to add the Blue Ox 1/2" Quick Link for Safety Chains part # BX229-0512 to the factory connection point to attach the safety chains to or you can add new hooks to the trailers like the Buyers Products 3/8" x 35" Class 4 Trailer Safety Chain w/ 1 Clevis Hook part # 337BSC3835 which allows you to connect to the factory connection points. For trailers under 10k the first option works once you get over it is best...
    view full answer...
  • How To Charge Trailer Battery On Dump Trailer Using The 7-Way Trailer Connector
    You will want to use a circuit tester like part # 40376, and check the # 4 terminal on the back of the 7-way trailer connector on your trailer for power. This is the 12 volt power terminal so there should be power to that terminal. You will need to run a 10 gauge power wire like the, # 10-1-1, from the # 4 terminal (12 volt) on the 7-way trailer connector on the trailer to the positive terminal on the trailer battery. This will allow you to maintain a charge on your trailer battery, it...
    view full answer...
  • Connection 12 Volt Power Wire for 7-Way on a 2009 Dodge Journey
    Whether you are talking about the 12 volt power wire from a 4-Way powered converter or the 12 volt circuit from a 4- to 7-Way adapter, such as # 37185, they both connect to the vehicle positive battery terminal. It sounds like you are talking about the 7-Way so for it you will need a 40 amp circuit breaker, # PK54540, and enough wire, # 12-1-1, to reach from the front of the vehicle to the rear. You would change the number in the quantity box on the wire page to the amount of feet needed....
    view full answer...

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