LED Backup Light w/ Flange for Trucks or Trailers - Submersible - 10 Diodes - Round - Clear Lens

LED Backup Light w/ Flange for Trucks or Trailers - Submersible - 10 Diodes - Round - Clear Lens

Item # BUL11CBX

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BUL11CBX - Round Optronics Tail Lights
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  • Tail Lights
  • Round
  • LED Light
  • White
  • Recessed Mount
  • 4 Inch Diameter
  • Submersible Lights
  • Optronics
  • Backup
  • Rear Reflector
5-3/4" Diameter round. Waterproof, LED trailer light is certified for backup light function in a 2-lamp system when a pair of lights is installed. Built-in reflector. Durable polycarbonate housing and lens. Surface mount with built-in flange. Lowest Prices for the best trailer lights from Optronics. LED Backup Light w/ Flange for Trucks or Trailers - Submersible - 10 Diodes - Round - Clear Lens part number BUL11CBX can be ordered online at etrailer.com or call 800-298-8924 for expert service.

  • All Info
  • Reviews (21)
  • Q & A (6)
  • Videos (1)
  • Photos
  • Why etrailer?

Optronics Trailer Lights - BUL11CBX

5-3/4" Diameter round. Waterproof, LED trailer light is certified for backup light function in a 2-lamp system when a pair of lights is installed. Built-in reflector. Durable polycarbonate housing and lens. Surface mount with built-in flange.


  • Round backup light for trailers and utility trucks
    • Certified for backup light function when installed as a pair in a 2-lamp system (second light sold separately)
  • Sonically sealed, waterproof housing and lens unit is submersible
  • Built-in reflex reflector removes the need for a separate reflector
  • 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
  • Durable polycarbonate housing and lens
  • Clear lens over white LEDs
  • Compatible with 12V DC systems
  • Surface mount with built-in flange - hardware not included
    • Requires a 4-1/2" diameter cutout
  • Accepts industry-standard, 2-prong plug (A49PB or A45CB - sold separately)
  • DOT compliant
    • Meets FMVSS 108 requirements in any 360-degree position


  • Dimensions: 5-3/4" diameter x 1-5/8" deep
  • Distance between mounting holes (center on center): 4-7/8"
  • Diodes: 10
  • Power draw at 12.8V: 0.26 amps
  • Lifetime warranty on LEDs

Optronics BUL11 Series LED Backup Light with Flange 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.

BUL11CBX Optronics LED Backup Light w/ Mounting Flange for Utility Trucks or Trailers - Submersible - Reflex Reflector - 10 Diodes - Clear Lens

Alternate part number: BUL-11CBX

California residents: click here

Video of LED Backup Light w/ Flange for Trucks or Trailers - Submersible - 10 Diodes - Round - Clear Lens

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Optronics Trailer Lights - Tail Lights - BUL11CBX Review

Today, we're going to be reviewing Part Number BUL11CBX. This is the Optronics LED Trailer Backup Light with a clear lens. It's a nice, round light. The white trailer reverse light is certified for backup light functions when installed as a pair in a 2-lamp system. It's going to feature your long-lasting, super-bright LEDs. Those are going to be a great replacement for incandescent lights. It's also going to feature the multi-diode design that's going to optimize your light output so you don't have to worry about replacing any bulbs and you dont have to worry about brittle filaments.

The LED system is more efficient. It's going to provide a brighter light and use less power. Now, its also going to feature a built-in reflex reflector on the mounting flange that goes around the perimeter of the light. That's actually where our connection points are going to be. There's going to be three connection slots on this. You got one, two, and three, making a triangular shape.

Its also going come with a mounting flange that has three connections in it. Those connection holes are going to line up perfectly with the ones on the perimeter of our light. It's got the sealed, waterproof, one-piece molded plastic housing with a durable lens. It is going to be corrosion resistant. It's also going to accept your industry-standard, 2-prong plug. I'm going to get into some more detail about the connection point when I make our connection and show you what the light looks like with power running to it. It is Department of Transportation compliant.

It's going to meet FMVSS 108 requirements in any 360-degree position. Again, its a nice, round light. The overall dimensions measuring from end to end is going to give us a diameter of 5-7/8 inches. Now, the actual light, so just measuring inside to inside of that reflector portion, is going to give us a diameter of 4.5 inches. Now, the depth is going to measure 1-5/8 inches. It's going to contain 10 diodes which are going to be the LED units.

The power draw is going to be 0.260 amps at 12.8 volts. Again, it does include the flange for installation, but your hardware is not going to be included. Now, the diameter of the hole that's needed to mount, we can simply just take a measurement inside the mounting flange, and that's going to give us our measurement of 4.5 inches. Now, were going to go and connect it to our external power source. Now, real quick, I do want to explain, here on the back, you're going to see that it has a 3-prong connection on it. Now, it only requires a 2-prong plug that is going to be sold separately. The one I'm using for our demonstration today can be found right here, etrailer.com, using Part Number A45CB. On the back, youre going to see a 3-prong connection. I dont want this to confuse you. Instead of making a specific 2-prong connection, Optronics uses the same housing and connection for all of their round lights. This unit is going to use two connections. It's going to use a ground and a reverse function, so it only requires a 2-prong plug. If we connect our 2-prong plug, you can see here that it's just simply going to slide into the connection points. That's already going to come with dielectric grease on it. The housing on the light is, that's just to help keep the prongs protected from corrosion. With the 2-prong connection made, you can see that it covers up all three prongs. That's really going to help keep out any dirt or grime that tries to get inside that connection point. Again, it uses the industry-standard, 2-prong connection plug and not a 3-prong, even though it has a 3-prong connection on the back of the housing. Weve got all of our wires connected, and we can turn off our overhead lights and turn on the power source. You can see here that its going to operate when I hit the reverse switch. Nice, consistent LED signal, a really nice little bright light. Anytime that reverse function is activated, its got a really quick response time. Its going to come on pretty immediately, providing, again, that nice, strong LED white light signal. That's going to do it for today's review of Part Number BUL11CBX. This is the Optronics LED Trailer Backup Light. .

Customer Reviews

LED Backup Light w/ Flange for Trucks or Trailers - Submersible - 10 Diodes - Round - Clear Lens - BUL11CBX

Average Customer Rating:  4.7 out of 5 stars   (21 Customer Reviews)

5-3/4" Diameter round. Waterproof, LED trailer light is certified for backup light function in a 2-lamp system when a pair of lights is installed. Built-in reflector. Durable polycarbonate housing and lens. Surface mount with built-in flange.




Great replacement, very bright and nice rubber gasket included. 639652


Everything went well with the product. The guys installed the units on their truck. Very pleased with the process of ordering the lights. 602487


The package with the lights arrived a day early. I spent an hour with the help of a friend swapping them out on the back of my 1990 Peterbilt Midranger box truck. They were easy to install, work flawlessly, and look great. I replaced the lights that had used conventional bulbs, which were always problematic, due to vibration, moisture / road salt, etc. These units are sealed, so hopefully will provide long and trouble free service. 585782


These worked great on a 2005 Fleetwood Expedition Motorhome. 553101


Great replacement part. 545011


I have ordered from you before and your product and service was excellent. There was one item in this order that was broken. I am contacting you to see if you will replace this item. 490406


Excellent product. Very fast shipping. 363369


Spent over 8 hours looking for these same exact lights before I put my bus on the road for inauguration. Went to dozens of bus dealers, and part vendors, but i couldn't even find similar. Even called the manufacture, but they advised since i wasn't a distributor, they couldn't sell to me directly, neither did any of there distributors have it. Make a long story short, etrailer saved my butt! 336830


Fit right in opening of original light. Super bright. Easy plugin. Great guys to buy from 331059


These Lights work great, Lot more light than the bulb light that came with my RV. I have recommended etrailer to several of my friends in our camping group. Thanks etrailer -------- Doyle 324815


After 8-9 months of installing trailer LED backup light, the rear housing fell out from the lens portion. I had to use super glue to glue the two back together. I'm worried about moisture entering the light this winter sense don't have anything to seal the joint so I guess I'll wait and see if it fails. 306994


Everything is good

Craig - 10/17/2017



Great product very bright. I put a pair of them on my boat trailer hooked up to my back up light. They really brighten up the ramp when I launch before sun up. No more flash light out the window, I wish i had installed them years before! 263143


Great product fast shipping 174995


they were to big 11/6 to big 171762


unimaginable improvement from one ancient and lackluster incandescent bulb to 10 LED diodes-requires modification of hole but is fairly simple and worth the effort-I used it as the porch light on my '72 airstream reno-great result! 139487


Item has not been installed at this time so I am unable to give you a review. I am only rating you on ordering and shipment of product in a timely fashion. 114860


Shipping was fast, part was great! 108397


great product 96822


as advertised thanks 65883


Lights arrived quickly. I used these lights to replace one existing and add a second back up light on work truck. They worked perfect and brighter than stock light 26846


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Info for this part was:

Written by:
Tyler C
Expert Research:
Jameson C
Installed by:
Cole B
Updated by:
Brian T

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