bing tracking image
  1. Work Lights
  2. Optronics
  3. LED Light
  4. Exterior Lights
  5. Interior Lights
  6. Surface Mount
Optronics LED Trailer Utility Light - Submersible - 10 Diodes - Oval - Clear Lens

Optronics LED Trailer Utility Light - Submersible - 10 Diodes - Oval - Clear Lens

Item # BUL78CB
Our Price: $22.09
Work Lights
Shipping Weight: 0.28 lbs
Add to cart
In Stock
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Customer Photos


Need help with installation?
Locate installers near me
7-9/16" x 3-5/16" Oval. Waterproof LED utility light provides bright light to illuminate an area. Durable polycarbonate housing and lens. Surface mount with built-in flange - no panel cutout required. 2-Wire design. Great Prices for the best work lights from Optronics. Optronics LED Trailer Utility Light - Submersible - 10 Diodes - Oval - Clear Lens part number BUL78CB can be ordered online at or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (108)
  • Q & A (0)
  • Photos

Optronics Work Lights - BUL78CB

  • LED Light
  • Exterior Lights
  • Interior Lights
  • Surface Mount
  • Oval
  • Utility Lights
  • White
  • Optronics

7-9/16" x 3-5/16" Oval. Waterproof LED utility light provides bright light to illuminate an area. Durable polycarbonate housing and lens. Surface mount with built-in flange - no panel cutout required. 2-Wire design.


  • LED utility light provides bright light to illuminate an exterior or interior area
    • Not certified for backup light function
  • 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
  • Durable polycarbonate housing and lens
  • Clear lens over white LEDs
  • Compatible with 12V DC systems
  • Surface mount with built-in flange - no panel cutout required
  • 2-Wire design includes power lead and ground wire


  • Dimensions: 7-9/16" Long x 3-5/16" wide x 3/4" deep
  • Light output:
    • Effective lumen output: 490 lumens
    • Raw lumen output: 700 lumens
  • Diodes: 10
  • Power draw at 12.8V: 0.054 amps
  • Lifetimew warranty on LEDs

Manufacturer Cross Reference

  • This light functions as an exact replacement for:
    • Wesbar EZ

Optronics BUL78 Series LED Utility Light 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.

Raw Lumens vs. Effective Lumens

Lumens are used to measure the amount of usable light that is put out by a light source. Raw lumens represent the number of lumens that the manufacturer claims the LEDs are capable of producing. It does not include the light's drive method or the amount of light lost from the lens or reflector. Effective lumens take these factors into account and represent the number of lumens that are actually produced by the complete light assembly, not just the amount of light that the diodes are capable of producing. This light has a 700 raw lumen capacity and produces 490 effective lumens.

BUL78CB Optronics LED Trailer Utility Light - Submersible - 10 Diodes - 490 Lumens - Oval - Clear Lens - 2-Wire

Alternate part number: BUL-78CB

California residents: click here

Customer Reviews

Optronics LED Trailer Utility Light - Submersible - 10 Diodes - Oval - Clear Lens - BUL78CB

Average Customer Rating:  4.7 out of 5 stars   (108 Customer Reviews)

7-9/16" x 3-5/16" Oval. Waterproof LED utility light provides bright light to illuminate an area. Durable polycarbonate housing and lens. Surface mount with built-in flange - no panel cutout required. 2-Wire design.



After a long while of
trying to find a comparable replacement on that A site, I found They had an exact match to the light that was originally on my trailer. The installation was simple and now I have two matching lights again and one neither is flooded with water.



Unfortunately, the new light has leaked and now has water in it. Otherwise it seems to be doing well.


I attached two of these clear utility lights to each aft side of my boat trailer. They are wired to the backup lights on the truck. This gives me excellent lighting when backing down my curving driveway. Clear utility lights are much brighter than regular backup lights and allow me to see the driveway even on the darkest nights.

Ron P.


Lights work great! They have made backing up a long dark driveway much easier. Now I have plenty of light on each side of my boat trailer. Slim profile and water proof just right for a boat trailer.


These illuminate adequately for what I purchased them for. Brighter would be better but they help take some of the guesswork out of backing up in the dark. I’d say they light up as well as my truck’s reverse lights. These are mounted on our 20’ boat trailer.



I am still happy with this purchase and would recommend it to future buyers.


I mounted the lights on the rear bumper of my travel trailer. I ran the wire into a storage compartment that had 12VDC. I connected to the power and added a rocker switch. The lights are very bright and the price was good. Can't wait to go camping and put these lights to work. I added a voice activated remote control: when backing up, I yell out the window "Hey Honey, go turn on the backup lights". Hasn't worked yet.


These I think are going to work awesome. Haven't tested it in the water yet, but as far as brightness these will light up the darkest boat ramp. Installed on the back of boat trailer for night time launch/load, and wired into my reverse lights. Highly recommend if your looking for a great backup light.


I just installed them on my Freightliner MDT as backup lights. Installed 4 of these. They work just as they should. The hole pattern was exactly the same as with the old lights.


These are very good lights. I just mounted a pair of these below my brake/turn lights on my enclosed trailer, and they work very well. Now I'll be able see when parking the trailer at night, and people will actually know I'm trying to back up now.


Good unit for the money and purpose served (reverse light on ATV). Lighting was good as well - as bright as I wanted.


This was so easy, and the prices beat all! thank you so much. oh and delivery was next day.


World class lights. Waterproof and bright!! Will buy again for sure. 4 screws and one hole for wires. My application is back up lights for a trailer.


Great reverse light.... really bright and easy to mount and wire for the do it yourselfers.


Sales person Bailey was very polite, and kept me informed on tracking and arrival will be doing business with your company in the future.


Good and bright. Makes backing up a trailer at night much easier.

Greg P.


1 year later and no complaints.


These are great lights. I bought two of them to use as reverse lights on my boat trailer. They light up bright and allow me to see behind the trailer. I liked them so much I bought three more use as a side marker light and two for cabin lights on the boat. Shipping was nice and fast as well. Thanks etrailer.

Rob M.


Adrian,I too just installed a set of these as reverse lights on my 5x8 utility trailer, based on your input. Thanks, they work great.I ordered these with grommets no need with the flange and the brackets to mount them to. I had to do some minor drilling to have the holes mate but that was no problem.I fished my wiring through the manufacturers existing routes and tapped into my reverse lights, attaching them with a Hopkins 4 Flat extension that I cut in half.Im in business!


I got these for my trailer for when I am backing down the ramp in the dark and for putting the boat away at home where I don’t have any lights in the carport. Man are these bright and do the job. It lights up the area behind me and I never have to worry about hitting anything while backing down or putting the boat to bed. If you’re tired of not having enough light on your boat trailer look no further.

As for usage, I have had these on for a year now without any issues whatsoever. Also, I take the boat out at least twice a week during the winter and several times a week spring through fall so they get lots of use.


Works good, and is decently bright for a back up light. Like the two wire design and flange mounting. Put it on a boat trailer for back up lights. Did add extra sealant around the flange to clear lens, just to help the factory plastic welded connection. Have had no issues so far.


Installed on my 2014 Polaris Ranger as Cab and Backup Lights.

Ernie G.


They work great as back up lights for My Polaris Crew


Wanted this light as a 12 volt light in our ice fishing shanty. Works very well, gives off a lot of light and because it is LED it uses very little power. Have had it on for 6 hours at a time and it continues to work very well. It does produce a somewhat straight lite beam so I mounted it on the top corner of the wall/ceiling pointing across the shack and it lights the room well, would work well as it was designed for a vehicle. It is our only light in a 8x12 room.


I'll give it 5 stars if it wasn't for the long time before shipping...very happy with product, installed four in my horse trailer and make a huge difference. Also installed 6-1/2" Oval LED Trailer Utility Light, Flange Mount, 10 Super Diode - Clear - BUL78CB in back of trailer for safe night horse loading/unloading. see before and after pics


I am very pleased with both of the lights that I purchased. they were back ordered but worth waiting for once they arrived. I installed the brake / taillights today and as I mentioned they are great.
I will install the utility lights in two weeks


Product is of good quality, and the lights are quite bright. I like that the housing is plastic, we are in the Northeast, and these lights will see a considerable amount of salt. We will see if the wiring holds up to the road salt!

Tom R.


They made it through an Upstate New York winter mounted on the bottom of a fire truck, no problems at all!


Sorry no pictures. I'm on the road. Will send soon. Installed on my Motorhome. Mounted two on each side close to axles so I can see tires when pulling into campgrounds. One at the back to assist in unhooking tow vehicle and one over windshield to see low hanging branches. Works like a dream. Will be adding more to help me see. I wired them into my cargo light circuit so I just flip my dash switch and light up the highway while driving. Sweet.


Bought 6 of these for use inside a 48ft Kentucky trailer used by local HS marching band. Work very well to light up under deck space at night for kids to load instruments. They tend to be more focused with the highest brightness, but overall work well for general lighting. All 6 worked out of box. Didn't get any tech info with them in the box. Best price I saw on this size, good deal.


Great lights, installed four on an enclosed trailer for backup lights. Easy to install and really bright. Probably could have used just two, but with four there will be no problems seeing where I'm backing.


I mounted these on the rear and sides of my 42' 5th wheel so I can see when backing up. These lights are very bright and light up the area behind the camper very well. Great price too!

Show More Reviews

See what our Experts say about this Optronics Work Lights

  • Trailer Lighting Needed for Loading a Boat onto a Trailer In the Dark
    The Optronics Transit LED Backup Light, part # BUL90CB would be a brighter light than the Optronics Sealed, Oval LED Trailer Utility Light, part # BUL78CB. It would work great for a lighting up the area behind your boat trailer for loading a boat in the dark. The # BUL90CB is also a submersible light which means it has a sealed, waterproof housing and lens. This will be be a good feature since you are using this light on the back of a boat trailer that will be backing down a boat ramp....
    view full answer...
  • White Reverse Light Similar to Truck Lite Model 66
    Probably the closest light we have to the TRUCK LITE MODEL 66 you mentioned is the part # BUL78CB which is an LED surface mount light very similar in size and install.
    view full answer...
  • How to Wire in the Optronics Sealed LED Utility Light # BUL78CB as Trailer Reverse Lights
    You would not need to install a relay to use the Sealed Optronics Lights # BUL78CB on your trailer. These LED lights draw such a minimal amount of amperage that all you would need to do is tap into the reverse light circuit of your trailer wiring and you would be good to go. I attached an FAQ article on trailer wiring for you to check out also.
    view full answer...
  • What is the Brightness Output of the Optronics 6-1/2 Inch LED Trailer Lights
    Optronics uses candelas to rate the brightness of their lights instead of lumens and the output of the Optronics 6-1/2 inch Oval LED Back Up light, # BUL52CB, is 175 candela. At a distance of 1 foot, the candela output is equal to the output in lumens. This light has the highest candela output of any of our 6-1/2 inch oval LED lights. The LED 10 diode light, # BUL72CB, has an output of 123 candela and the LED 10 super diode light, # BUL78CB, has an output of 125 candela. Another thing...
    view full answer...
  • Optronics Oval LED Trailer Light Recommendation for a 53 ft Enclosed Trailer
    The Sealed, 6-1/2 inch Oval LED Trailer Utility Light # BUL78CB that you referenced would be an excellent choice to provide lighting on a trailer to help with night time loading. Since it is an LED light it would not put an excessive load on your trailer wiring either. Check out the review video I attached for this light also. If you wanted to dress up the appearance of the light you could get a Chrome Accent Ring # A78CB also.
    view full answer...
  • Light Output in Lumens of Optronics Oval LED Utility Light # BUL78CB
    The output of the Optronics Oval LED Trailer Utility Light # BUL78CB is 125 Candela, according to my contact at Optronics. At a 1 foot distance, the candela output is equal to the output in lumens. There is a chrome accent ring available for this lamp, it is part # A78CB.
    view full answer...
  • What is the Power Draw For Sealed, 6-1/2 Inch Oval LED Trailer Utility Light, # BUL78CB
    The Sealed, 6-1/2 Inch Oval LED Trailer Utility Light, # BUL78CB, as a whole, draws 0.080 amps at 12.8 volts. To determine watts, you would take amps and multiply by volts to get 1.024 watts consumed. You may also be interested in Chrome Accent Ring, # A78CB, to provide a little dress up and some extra protection.
    view full answer...
  • Is the Sealed, 6-1/2" Oval LED Trailer Utility Light # BUL78CB SAE Rated
    The Sealed, 6-1/2" Oval LED Trailer Utility Light # BUL78CB is intended to be used as a utility light and is not rated or certified to be used as a reverse light or anything else DOT related. This would be a great light to light up the interior of an enclosed trailer or if you needed to light up an area on the exterior of your trailer at night. As far as DOT or SAE is concerned it has no specific ratings since it's not designed for taillight signal use. I attached a review video for this...
    view full answer...
  • Brightness of the Sealed, 6-1/2" Oval LED Trailer Utility Light # BUL78CB
    The Sealed, 6-1/2" Oval LED Trailer Utility Light # BUL78CB that you referenced is very bright. This light produces 175 candela which should be brighter than DOT back up lights. I attached a review video for more info. There are no DOT standards that dictate that a reverse light has to be at least a certain brightness so it's hard to say for certain if this light would be brighter than any DOT reverse light. But considering how bright this light is I would imagine it is much brighter than...
    view full answer...
  • Sealed 6-1/2 Oval LED Trailer Utility Light # BUL78CB Recommendation
    The Sealed, 6-1/2" Oval LED Trailer Utility Light # BUL78CB that you referenced is pretty bright. I has an output of 125 candela and is used by most as a utility light for either the inside or outside of a trailer so it would work very well for you. Check out the review video I attached for more info as well.
    view full answer...
  • Recommended Optronics Assembly for Adding Backup Lights to Sprinter
    I recommend going with the Optronics LED Backup Light # BUL10CB, as it will provide you with a clear, bright LED and it is DOT approved to be used as a backup lamp. The Optronics Sealed Oval LED Light # BUL78CB that you also mentioned is a nice utility light, but it is not actually DOT approved to be used as a backup lamp on a vehicle. To install the light assemblies, you can use the 2-Wire Pigtail # A45CB. The white wire will be attached to a bare metal surface of the frame for ground,...
    view full answer...
  • How Does Trailer with 7-Way Wire to Reverse Lights
    Since you have a 7-way you have the reverse light circuit pin already present so you'd need just to wire from the center pin of the 7-way to reverse lights like the # BUL78CB.
    view full answer...
  • Why is the Optronics LED Clear Oval Trailer Utility Light # BUL72CB Not Certified as a Backup Light
    The Sealed, 6-1/2 inch Oval LED Trailer Utility Light, Flange Mount, 10 Super Diode - Clear, item # BUL78CB, does not meet DOT FMVSS 108 requirements, for backup lights so it cannot be sold as a backup light. That does not mean that the light cannot be used in that situation for applications where a DOT requirement does not need to be met. In short, the Trailer Utility Light, item # BUL78CB, can be used as a backup light, but if your trailer needs to meet DOT requirements you will need...
    view full answer...
  • Comparing Optronics LED Lights Candela Output
    My contact at Optronics was able to give me a brightness comparison between their LED lights # BUL78CB and # ILL31CB. Although both use 10 LEDs, the BUL78CB uses super diodes that deliver a lot more actual light output. Optronics was able to give me the candela specification for each light. This scale differs from lumens but it still gives you a good comparison basis. A common candle emits light with a luminous intensity of roughly one candela. Light # ILL31CB offers 44 candela output...
    view full answer...
  • Will the Optronics Snap-on Reflector Ring # A78RXB Fit STL78 and BUL78 Trailer Lights
    I spoke with my contact at Optronics and verified that the Snap-on Reflector Ring, # A78RXB, will fit the BUL78 and STL78 series LED trailer lights. The configurations of the lights are the exact same. The only difference is one is a backup light (BUL78) and one is a stop, turn and tail light (STL78). It is not customary to put a red reflector ring around a clear light, but there is no reason why you could not do that. Keep in mind, the # BUL78CB is a utility light, so it will have a...
    view full answer...
  • Comparing Various LED Lights for Use with a Powered Wheelchair
    The Great White LED Utility Light, part # PE63FV, that you referenced is a 16-diode LED light that is compatible with 12V and 24V outputs and has a 2-wire pigtail. The Light Guide LED Backup Light for Truck/Trailer, part # BUL602CB, is a 12-diode LED light that has a PL-2 connection type. The Optronics LED Trailer Utility Light, part # BUL78C3MB, is a 10-diode LED light that is compatible with 12V systems and accepts industry standard 2-prong or 3-prong plugs. The other Optronics...
    view full answer...
  • Troubleshooting Utility Trailer Lights not Working When Hitched to Tow Vehicle
    If your trailer lights are not working when you are hitched to your tow vehicle but are otherwise fine you have a ground problem most likely. Check your grounds to make sure your they are attached to bare metal surfaces and free of any paint, dirt or corrosion. It is also possible that you have a problem with a bare wire touching the frame somewhere on your trailer so check your wiring thoroughly to make sure there are no broken wires. I have also added a link to a wiring troubleshooting...
    view full answer...
  • How to Wire LED Trailer Utility Light # BUL78CB to Turn On and Off when Needed
    The best way you could wire LED Trailer Utility Light # BUL78CB to turn on and off on demand is to wire it in line with a switch, # PK34513. The power wire from the light would attach to a wire on the switch and the other switch wire would go to the positive battery terminal. Don't forget to ground the light's white wire!
    view full answer...
  • Is Optronics Oval LED Trailer Utility Light BUL78CB Submersible
    You can submerse Optronics trailer light # BUL78CB. The housing and lens unit are sealed. You will also need to make sure the wiring gets sealed up water tight. You can use heat shrink tubing or coat the connections in liquid electrical tape, # SWC50122. I have included a link to a video review for this light for you.
    view full answer...
  • Utility Trailer Lights That are Waterproof With Low Power Draw
    We do offer utility lights for your trailer that are waterproof, and the lights you will need that have a low power draw are going to be LEDs as they draw far less amperage than incandescent lights. There are numerous lights available in different shapes and styles, and you didn't specify exactly what you needed for your trailer, so I'll list a few examples for you. - Optronics LED Trailer Utility Light # BUL78CB This is a 7-9/16" Long x 3-5/16" wide x 3/4" deep light that puts out just...
    view full answer...
  • Is a Rubber Grommet Needed to Install Optronics Oval 10-LED Trailer Utility Light # BUL78CB
    The Optronics Oval 10-LED Trailer Utility Light, part # BUL78CB, is made with a built-in mounting flange for surface-mount installation where there is no cut-out for the fixture. This item includes both ground and positive wire leads that exit from the rear of the housing. This product does not require a rubber mounting grommet as do some similar products from Optronics, although we do offer a snap-on chrome-finish accent ring for it, part # A78CB. For example, their # BUL72CB is a similar...
    view full answer...
  • Light Output of Optronics LED Utility Light # BUL78CB Versus Standard # 1156 Bulb
    The light output delivered by the Optronics # BUL78CB would be considerably greater than that of a single 1156 single filament bulb. A single 1156 would put out about 32 Candela, while the Optronics # BUL78CB puts out 125 Candela. If you were considering using the # BUL78CB as a back-up lamp, keep in mind that it does not meet DOT specifications as a back-up lamp. This will not present a problem unless your trailer is used commercially. If you need to meet DOT specs, use a lamp like #...
    view full answer...
  • Availability of Reverse Light Similar in Shape and Size to MCL48CAB
    For a similar light that is white that would work well as a reverse light you would want the part # BUL78CB. There isn't a white version of the # MCL48CAB. The # BUL78CB is a similar flange mount light that measures 7-1/2L x 3-1/4W Inch. I attached a review video for the light for you to check out as well.
    view full answer...
    Image 1 for
  • DOT Approved Trailer LED Reverse Light and an LED Interior Trailer Light
    Optronics light # BUL78CB is a utility light so it is not DOT approved to be used as anything other than that. For the interior of the trailer it will work fine, it doesn't have to be DOT approved since it isn't a tail, marker, reverse, brake, or turn signal light. It is about as tough as any other trailer light that you would find but I would not expose it to repeated impact from cargo. the lens or flange would eventually crack. If you are looking for a DOT approved reverse light with...
    view full answer...

< Previous

Do you have a question about this Work Light?

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Robert G
Expert Research:
Robert G
Employee Michael H
Expert Research:
Michael H
Employee Jeff D
Expert Research:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Patrick B
Video Edited:
Patrick B
Employee Laura H
Updated by:
Laura H
Employee Amy B
Updated by:
Amy B
Employee Wilson B
Updated by:
Wilson B
Employee Brian T
Updated by:
Brian T
Employee Cole B
Installed by:
Cole B

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.

Product Experts Available Now!
Call 1-800-940-8924