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LED Backup Light w/ Flange for Trucks or Trailers - Submersible - 10 Diodes - Round - Clear Lens
(302 reviews)
Price: $36.94
In Stock
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LED Backup Light w/ Flange for Trucks or Trailers - Submersible - 10 Diodes - Round - Clear Lens
Part Number: BUL11CBX
In Stock
$36.94
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- All Info
- Reviews (302)
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Optronics Trailer Lights - BUL11CBX
Highlights
- Reliable In Any Weather: Sonically sealed, waterproof housing keeps water out for lasting performance.
- Fewer Replacements Needed: LEDs last 50 times longer and use less power than incandescent bulbs.
- One Light, Certified Function: Meets DOT and FMVSS 108 backup light standards when used as a 2-lamp system.
- Built-In Safety Reflector: Integrated reflex reflector removes the need for a separate reflector.
- Simple 12V Connection: Works with standard 2-prong plug (A49PB or A45CB) for easy setup.
- Durable Polycarbonate Build: Tough lens and housing resist impact and corrosion.
Features to know about
Bright, Efficient Backup Lighting: 10-Diode LED Output
This round 5-3/4" light packs 10 white LEDs behind a clear lens for crisp, even illumination when backing up. The LEDs are DOT compliant and meet FMVSS 108 requirements in any 360-degree position. They’re designed to last 50 times longer than incandescent bulbs while drawing only 0.26 amps at 12.8V. That means brighter light with less power use and no fragile filaments to worry about replacing.
No More Water Damage: Sonically Sealed and Submersible Design
Water can be rough on trailer lights, but this one is built for it. The housing and lens are sonically sealed into a single waterproof unit that’s completely submersible. Whether it’s backing down a ramp or driving through heavy rain, moisture stays out so the diodes and circuit board stay protected. It’s a simple fix for anyone tired of fogged or shorted lights after every trip.
Stronger Build for Everyday Use: Durable Polycarbonate Housing
The clear polycarbonate lens and tough housing make this light a solid choice for demanding environments. It holds up to vibration, impacts, and UV exposure without cracking or fading. The built-in reflex reflector removes the need for an extra reflector, keeping things cleaner and simpler on the back of your trailer or truck body.
Straightforward Installations: Surface Mount with Built-In Flange
Installing this light is simple thanks to the integrated flange and standard 2-prong connector setup (A49PB or A45CB pigtail sold separately). It uses a 4-1/2" diameter cutout and three mounting holes spaced 4-7/8" center-to-center. Just line it up, plug it in, and you’re set with a low-profile fit that looks clean and professional.
Reliable Performance Every Time: Back-Up Certified in a 2-Lamp System
When installed as a pair, these lights are certified for backup function in a 2-lamp system—giving you dependable white light coverage exactly where you need it. It’s a simple way to improve rear visibility and safety with a setup that’s efficient, rugged, and built to last for years of use.
Specs
Dimensions
- Overall diameter: 5-3/4"
- Depth: 1-5/8"
- Distance between mounting holes (center on center): 4-7/8"
Electrical
- Power draw at 12.8V: 0.26 amps
Lighting
- Diodes: 10
Warranty
- LED warranty: Lifetime
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
Customer Satisfaction Score:
98% were satisfied with this product
2% of customers were not satisfied
- Product did not meet expectations
- Wrong item was ordered
Ratings & Reviews
4.7
302 reviews
by:
Jeffrey
10/11/2026
Second set I have purchased, perfect for my application which was an odd size. Great quality
by:
Rick
10/21/2026
Nice and bright! Fits my needs.
by:
kc
07/06/2014
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!
by:
Robert
04/22/2026
Perfect fit 2017 Georgetown xl 369ds
LOOKS 100% Better ! Ty
LOOKS 100% Better ! Ty
by:
Billy de la Cuesta
01/20/2026
The customer support was above and beyond what was expected!! Thank you...
Mike L.
1/20/2026
You're very welcome, Billy. I'm really glad we could help!
by:
Craig
10/14/2016
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.
Craig
10/17/2017
Everything is good
by:
William
11/28/2018
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.
by:
Cam
01/14/2026
Great fast
by:
bow hunter extream
06/21/2016
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!
by:
Doyle
12/14/2016
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
Thanks etrailer -------- Doyle
by:
Mark
05/08/2019
2014
Ram
2500
Great replacement, very bright and nice rubber gasket included.
by:
Omar A
01/18/2017
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!
by:
DanI
11/11/2011
to replace one existing and add a second back up light on work truck. They worked perfect and brighter than stock light
by:
Wayne B
01/09/2017
2016
Ram
1500
Fit right in opening of original light. Super bright. Easy plugin. Great guys to buy from
by:
Tom M
04/05/2017
Excellent product. Very fast shipping.
by:
Jim C.
11/25/2013
Shipping was fast, part was great!
by:
Derek N
02/16/2015
Great product fast shipping
by:
Mike J
08/13/2018
2005
Ford
Expedition
These worked great on a 2005 Fleetwood Expedition Motorhome.
by:
Joseph
01/23/2025
Part as advertised and working perfectly
by:
Chrystal C.
07/23/2018
Great replacement part.
by:
Todd
02/04/2019
Everything went well with the product. The guys installed the units on their truck. Very pleased with the process of ordering the lights.
by:
Laura (Roscoe)
03/29/2018
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.
by:
Paul K.
01/27/2014
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.
by:
Zohair M.
08/25/2013
great product
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302
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See what our Experts say about this Optronics Trailer Lights
- Recommended 5-3/4" Diameter LED Backup Light Hey Mark, thanks for the information! The LED Backup Light w/ Flange for Trucks or Trailers item # BUL11CBX is going to be the closest option I have to your specifications. This is a 5-3/4" diameter LED back up light that mounts in a 4-1/2" diameter cutout. It has three mounting holes spaced 4-7/8" apart center on center. You can use the Right Angle 2-Wire Pigtail item # A49PB or the 2-Wire Pigtail item # A45CB to complete the installation. Do you see any part numbers on your Optronics...
view full answer... - Backup Lights Similar To the Optronics 4 Inch Round LED Trailer Light # STL42RBThe closest backup light that we carry to the 4 Inch Round LED Trailer Light, # STL42RB, is the 4 Inch Round LED Backup Light, # BUL11CBX. This is a 4 inch round clear back up light that has an overall diameter of 5-3/4 inches and a depth of 1-5/8 inches. This light will require a standard 2 prong plug, # A45CB, and has a reflector on the mounting flange.
view full answer... - Recommended Replacement Round LED Trailer Light W/ A Chrome BezelI took a look at what we carry and was able to find the: -LED Backup Light w/ Flange for Trucks or Trailers # BUL11CBX. This is a round LED light that has a 5-3/4" overall measurement, a clear lens, and a chrome bezel; which sounds like exactly what you're looking for. If this is not what you're looking for, let me know and I'd be happy to help you further. I have also attached a product overview video for you to check out as well.
view full answer... - Does the LED Trailer Backup Light # BUL11CBX Require a 2 or 3-Prong HarnessAt first glance the picture does imply that it needs a 3-prong plug, but if you look closely there are only wires coming from two of the terminals. And the 2-prong plug like part # A45CB will fit in this setup as the two prongs of the pigtail will line up with the 2 wires of the # BUL11CBX. If you check out the picture I attached you can see how the two products would work together.
view full answer...
- Cutout Dimension Needed to Install GloLight LED Backup Light # BUL101CKBThe hole size needed to install the Optronics light part # BUL101CKB is 4-1/2 inches. The reason this size is larger than the 4-1/4 inch diameter listed for the light is that the grommet of the light is not included in the 4-1/4 inch diameter. This would be brighter than the # BUL11CBX as well.
view full answer... - Does the LED Backup Light w/ Flange for Trucks or Trailers Need To Be Replaced If Water Gets InsideIf you have water inside the LED Backup Light w/ Flange for Trucks or Trailers part # BUL11CBX then that means the seal is broken. I recommend replacing this light as not only will it affect the luminosity of the light but it is very likely to cause a short on your trailer wiring harness. The seal can be broken by tightening the screws which hold the light too tight or just wearing out over time.
view full answer... - 4 Inch Round Tail Lights with Reflective LensI do have an option for you but the Fusion LED Trailer Tail Light part # STL201RB does not have a reflective lens. I looked through all of our other 4" round tail lights and none of the ones with the included reverse light have a reflective lens. Therefore, the best option we can offer you is to separate the tail light and reverse light housing with the LED Trailer Stop/Turn/Tail Light part # STL43RBX and LED Trailer Backup Light part # BUL11CBX. These are both 4" round LED lights with...
view full answer... - 4 inch Clear Recessed Mount Trailer Light RecommendationThe closest thing we have to a clear lensed version of the part # ST48RB that you referenced is the part # BUL11CBX which is clear and emits white light. This is commonly used as a backup light.
view full answer... - Suitability of Optronics LED Trailer Back-Up Lamp # BUL11CBX for a Boat TrailerThey certainly can. The Optronics # BUL11CBX is completely sealed and waterproof. They'd be perfect for a boat trailer. You'd also need either a right angle pigtail, part # A49PB or a straight pigtail, part # A45CB. Also keep in mind that although the lamps are waterproof, your trailer wiring might have junction points that aren't. This is why I recommend you unplug the boat trailer before backing into the water.
view full answer... - Mounting Hole Dimensions of LED Trailer Backup Light # BUL11CBXThe three mounting holes of the LED Trailer Backup Light # BUL11CBX that you referenced are on a circle that measures 4-7/8 inches in diameter like what is seen in the picture I attached.
view full answer...
Do you have a question about this Trailer Light?
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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Kate F.
10/13/2026
What a unique application Jeffrey! Is this part of a kids train?