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LED Backup Light for Trucks or Trailers - Submersible - 27 Diodes - Round - Clear Lens - 24V
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Optronics

LED Backup Light for Trucks or Trailers - Submersible - 27 Diodes - Round - Clear Lens - 24V

Part Number: BUL23C24B
302 Reviews | 9 Questions
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$38.38
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optronics trailer lights submersible 4-5/16 inch diameter led backup light for trucks or trailers - 27 diodes round clear lens 24v
optronics trailer lights tail submersible led backup light for trucks or trailers - 27 diodes round clear lens 24v
optronics trailer lights tail submersible bul23c24b
optronics trailer lights backup submersible bul23c24b
optronics trailer lights backup submersible

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4-5/16" Diameter round. Waterproof, LED trailer light is certified for backup light function in a 2-lamp system when a pair of lights is installed. Durable polycarbonate housing and lens. Recessed mount with grommet (not included). Great Prices for the best trailer lights from Optronics. LED Backup Light for Trucks or Trailers - Submersible - 27 Diodes - Round - Clear Lens - 24V part number BUL23C24B can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Optronics Trailer Lights - BUL23C24B

Highlights

  • Reliable In Any Weather: Sonically sealed housing keeps water out so LEDs stay protected.
  • Bright 27-Diode Output: Strong, even light pattern improves rear visibility while backing up.
  • Fewer Replacements Needed: LEDs last 50× longer and draw less power than incandescent bulbs.
  • Road Legal: Meets DOT and FMVSS 108 standards in any 360° mounting position.
  • Built for 24V Systems: Works with 24-volt DC power for trucks or trailers using that setup.
  • Tough Polycarbonate Build: Durable housing and lens resist cracks and impact damage.

Features to know about

Bright, Efficient Illumination: 27-Diode LED Backup Light

This round backup light throws out a strong, even pattern thanks to its 27 white LEDs under a clear lens. It’s built for 24V DC systems and certified for backup light use when installed as a pair in a 2-lamp setup. The LEDs use far less power than old incandescent bulbs while giving off a brighter, cleaner light. You’ll never have to deal with burned-out filaments or bulb swaps again—the diodes are rated to last up to 50 times longer and carry a lifetime warranty.

Protect Against Water Damage: Sonically Sealed and Submersible Design

Wet roads or full submersion won’t hurt this light. The polycarbonate housing and lens are sonically sealed together into one solid unit, keeping water from reaching the diodes or circuit board. That sealed design makes it ideal for trailers that see frequent dunking or heavy spray. You get consistent performance without worrying about leaks or corrosion cutting the life short.

Built Tough for Heavy Use: Durable Polycarbonate Housing

The housing and lens aren’t just waterproof—they’re tough. Made from impact-resistant polycarbonate, the shell stands up to vibration, bumps, and road wear. That durability means you can mount it once and count on it to keep working trip after trip, even when conditions aren’t gentle.

Clean Mounting Setup: Recessed Installation with Standard Plug-In Connection

This 4-5/16" diameter light recess-mounts neatly using a grommet (A45GB, sold separately) for a flush finish that stays out of harm’s way. It accepts standard 2-prong plugs like the A49PB or A45CB (sold separately), so hooking it up is simple and secure. At just 2" deep, it’s easy to fit in tight spots while keeping the back end tidy and professional looking.

Consistent Compliance and Safety: DOT and FMVSS 108 Certified

You don’t have to guess about legality—this light meets all DOT and FMVSS 108 requirements in any 360-degree mounting position. That means reliable brightness and coverage that help make your trailer visible during reversing, keeping things both safe and street-ready every time you tow.

Specs

Dimensions

  • Dimensions: 4-5/16" diameter x 2" deep

Technical diagram of the Optronics BUL23C24B round LED backup light showing dimensions, including 4-5/16 inch diameter and 2 inch depth, for trailers and trucks.

Electrical

  • Power draw at 12.8V: 0.145 amps
  • Compatible voltage: 24V DC systems

Lighting

  • Diodes: 27

Warranty

  • LED warranty: Lifetime

BUL23C24B Optronics 24V LED Backup Light for Utility Trucks or Trailers - Submersible - 27 Diodes - Round - Clear Lens

Alternate part number: BUL-23C24B







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Ratings & Reviews

4.7

302 reviews
5 Stars
(259)
4 Stars
(21)
3 Stars
(9)
2 Stars
(5)
1 Star
(8)
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by:
2003 GMC Yukon XL
Awesome LED light.... just what the doctor ordered for my bus!!
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With several of the MCL31 clearance I had half or all of the LEDs stop working. I did not at the time realize they had a lifetime guarantee so I just threw them away. When A bunch of the LEDs in both BUL52CBs and about half of the turn/stop LEDs in the STL37RB went out, I contacted etrailer and they happily replaced them, but it took a couple of weeks and I had to pay the shipping. When I replaced all of my trailer lighting, I had thought that I would never have to worry about it again. LEDs should last forwver. That turns out to not be the case and it is a lot harder to change out hard wired LEDs than socketed incandescent bulbs. I wish I could find reliable long lasting LED trailer lighting.
by:
Second set I have purchased, perfect for my application which was an odd size. Great quality
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Etrailer Expert

Kate F.

10/13/2026

What a unique application Jeffrey! Is this part of a kids train?

by:
Perfect replacement for the reverse lights on boat trailers. A better buy than ordering from the trailer company.
by:
Just what was needed to brighten up the rear of my horse trailer when loading and unloading in the dark
Scott profile picture

Scott

3/24/2026

Lights have withstood being in the weather all year and still function just as well as they did after installation. Excellent Product.

by:
Nice lights. I have the 36 diode oval LED lights mounted on a flatbed truck as reverse lights and they are not near as bright as these 10 diode lights. I have the 10 diode lights mounted inside a 6ftx20ft stock trailer on a toggle switch. There is one at the front and one at the back. They give off plenty of light to load and unload horses and cattle in the dark. I would buy these again for the next trailer I rebuild. The team at etrailer.com is top notch as well. Your order will ship the same day and arrive in a timely manner. If it does not they will tell you why. Great people to do business with.
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by:
These Lights were a perfect fit for my RV. They easily fit over the OEM flush mounted incandescent lights that were very dim by comparison. The soft rubber gasket that came with them made installation very easy and watertight. As you can see in the picture, I replaced both my brake & back-up lights. I've had several compliments on their looks by people that saw my RV before I installed these too! But most of all, I'm very satisfied with the huge increase in brightness when I need it. I would recommend these for any do-it -yourselfer out there to upgrade existing trailers, or for something you're building!
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Product exactly as needed. Existing lamps last about 8 to 10 weeks as docking lights on my motorhome; there are four - one at each wheel. These lamps fit perfectly and are much brighter. My expectation is that these lamps will last more than a year(?) We'll see.
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Bruce S.

3/16/2018

So far these lights have exceeded my every expectation! Absolutely no problems whatsoever. Thank you for making a quality product that I can depend on

by:
I purchased these Submersible LED bulbs for my boat trailer for two reasons. The first is so road traffic is aware of my intentions of backing up and the second is to make it easier to back my trailer into my driveway at night. The only thing that I find disappointing about this product, is that the wires are not sealed. You have to plug a pigtail in to power the bulb. Although they say it is watertight, I still plan on sealing the plug with some marine grade silicone sealant. Otherwise I am very satisfied with the way these bulbs light up my path of travel.
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2014 Ford F-150
I purchased this Optronics LED Backup Light to supplement the amount of reverse light that the T Bargman LED taillights provide. I installed them on a 1991 Ford E450 21 passenger church bus. This light is intended to be installed in a steel trailer frame with a rubber grommet which I did not order. I did not realize that a grommet was required. I probably would have ordered the grommets just in case I needed them but it was not made obvious to me on the website or recommended that I may want to consider including them in the order. After receiving the package and examining the light I realized that there was no way to secure the light into place without something. I went back to the website and looked up the light again and drilled down to the bottom and there it was, the grommet that I needed. Why didn't the site make the recommendation more obvious or suggest this part before ordering like it did with the wiring lead...? I was able to still make the lights work, it just took a little bit of planning which was required anyway with this custom retrofit application. I cut a precise hole into the fiberglass so that I could recess the light, which was my original plan even before realizing that the light required a grommet. I recessed the light in the hole and glued it in place with silicone. Time will tell if this was a good idea or not. I wish that I would have ordered the elbow wiring leads in stead of the straight ones. I ran into a clearance issue with the straight lead and had to modify them as well.
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2008 Toyota Tundra
the light fixture works very good except when used in the bracket, it leaves the back exposed to being hit by road debris. There is no cover on the light fixture. Therefore i went to a local fabricator and he made a fixture out of 2x4 steel tubing. The gasket fit perfectly but when i went to us the 2 wire pigtail, it was at the wrong angle for the light. I purchased another one locally. just wanted you to know that i could only use the light and the gasket.

Thank you for your prompt service.
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by:
These lights have been an outstanding upgrade from the original incandescent brake/turn/tail/reverse lights on my department's 1992 water tanker. The diodes in the lights are really bright and can be seen clearly at nighttime or during the day. 10 out of 10, would recommend!
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by:
Nice and bright! Fits my needs.
by:
Looks and works good
by:
Great and perfect replacement for the backup lights in my headache rack.
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2006 GMC Sierra
Nice & bright - should definitely provide more light when backing at night vs. the old incandescent bulb.
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2005 Acura TL
These lights are great. They light up much better than the stock incandescent bulbs that were in my ranch hand bumper. I can see great when backing my truck up now. They also fit better than the original bulb housings.
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by:
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!
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by:
Not to bright i guess they will do
by:
The pictures speak for themselves !! Couldn't be happier Just gotta get the taillights that match now. STL190RB
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by:
These reverse lights dress the back of of our flat beds nice and there real bright.
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by:
Lights were easy to install. Twenty minutes and both backup lights were done.
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by:
They look good just bought them as spares
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See what our Experts say about this Optronics Trailer Lights

Do you have a question about this Trailer Light?
  • 24V Lights Compatible With Prevost Coach
    Though The LED Trailer Clearance or Truck Cab Light # CBL22AB is only for a 12V system the only option we would have for you is to replace all the trailer lights on your trailer with lights that are compatible with 24V systems. We have a few select 24V taillights available for tail lights we have the Miro-Flex LED Trailer Tail Light # STL23R24B, The Transit Tail Light - Stop/Turn/Tail - LED - Submersible # STL90R24B. For Turn Marker Lights we have The LED Transit Turn Signal and Parking...
    view full answer...
  • Converting a Trailer with 12 volt Lights to 24 volt Lights for Compatibility with a Euro Spec Truck
    I think your only real option would be to replace the trailer lights on your trailer with lights that are compatible with 24 volt systems since there isn't an adapter available that we offer that would work for converting your 24 volt system to work with a 12 volt lighting system. Right now, we have a few select 24 volt tail lights. We have # STL23R24B and # STL90R24B. For turn/marker lights we have # STL90A24B and # STL23A24B. And for reverse lights we have # BUL23C24B.
    view full answer...
  • Option for Towing Trailer with 12 Volt Lights with 24 Volt Tow Vehicle
    I think your only real option would be to replace the trailer lights on your trailer with lights that are compatible with 24 volt systems since there isn't an adapter available that we offer that would work for converting your 24 volt system to work with a 12 volt lighting system. Right now, we have a few select 24 volt tail lights. We have # STL23R24B and # STL90R24B. For turn/marker lights we have # STL90A24B and # STL23A24B. And for reverse lights we have # BUL23C24B.
    view full answer...
  • Recommended 4 Inch Diameter Clear LED Back-Up Lamp w/ Pigtail and Grommet
    For a standard 12-volt electrical system, I'd recommend the Optronics # BUL11CB. The # A49PB right-angle plug is compatible with the lamp, and you'd need the # A45GB grommet. For a 24-volt electrical system, use the # BUL23C24B lamp, which is compatible with the same plug and grommet mentioned above.
    view full answer...
  • Availability of White LED Backup Light for 24V System
    I do have a solution, but unfortunately the # BUL603CB cannot be used with your 24V system. We have two options available that are specifically made for 24V. Those are the LED Backup Light for Trucks or Trailers - Submersible - 27 Diodes - Round - Clear Lens - 24V # BUL23C24B and the LED Backup Light - 10 Diode - Sealed - 4" Round-White w/Clear Lens-Weathertight Plug - 24 Volts # BUL11CM24B. Both of these lights have a 4-5/16" diameter with a recessed mount. If you need a rubber grommet...
    view full answer...
  • 24 Flange Mount Back-Up Light Recommendation
    Best option for that is the Transit LED Backup Light # BUL23C24B. This is a bright backup light that runs on 24 volts that surface mounts on a trailer.
    view full answer...
  • Flush Mount, Submersible LED Back Up Light Recommendation for a Trailer
    The brightest LED light, flush mount, submersible, that can be used as a back up light, is going to be the round light # BUL23C24B. But this is a 24 volt light and it has 27 diodes. For a 12 volt back up light that is flush mount and submersible would be # BUL10CB or # BUL11CB. For the BUL10CB that you have referenced, you will also need grommet # a70gb, and a wiring harness # A49PB. For the round light # BUL11CB, you would need grommet # A45GB. and harness # A45CB.
    view full answer...
  • 24 Volt White Trailer Light Recommendation
    For a similar light that can be used on a 24 volt system you would want the part # BUL23C24B, but the # BUL78C3MB that you referenced can only be used on a 12 volt system.
    view full answer...
  • Trailer Lights Available for a 24V System
    We do have a handful of 24V trailer light options. For taillights, we have the Miro-Flex LED Red # STL23R24B, Miro-Flex LED Amber # STL23A24B, and Transit Tail Light LED Red Lens # STL90R24B. For clearance lights we have the Thin-Line LED Trailer Clearance/Side Marker Light, Red # MCL66R24B and Thin-Line LED Trailer Clearance/Side Marker Light, Amber # MCL66A24B. For backup lights we offer the LED Backup Light, 10 Diode, Sealed # BUL11CM24B, LED Backup Light, and the 27 Diodes, Sealed,...
    view full answer...

Do you have a question about this Trailer Light?


Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Tyler C
Written by:
Tyler C
Employee Wilson B
Updated by:
Wilson B
Employee Ronnie R
Updated by:
Ronnie R
Employee Brian T
Updated by:
Brian T
Employee Manda E
Updated by:
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Employee Carrie F
Updated by:
Carrie F

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