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Optronics

Optronics LED Backup Light for Transit Vehicles - Submersible - 42 Diodes - Round - Clear Lens - 12V

Part Number: BUL90CB

301 Reviews | 15 Questions

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Retail:$86.11

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7" 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. Surface mount - hardware not included. 2-Wire design. Great Prices for the best trailer lights from Optronics. Optronics LED Backup Light for Transit Vehicles - Submersible - 42 Diodes - Round - Clear Lens - 12V part number BUL90CB can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.

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Optronics Trailer Lights - BUL90CB

Highlights

Bright Reverse Visibility: 42 LEDs create a strong, clear backup light pattern.
Reliable In Any Weather: Sonically sealed, waterproof housing stays dry and submersible.
Fewer Replacements Needed: LEDs use less power, last 50× longer, and have no bulbs to break.
Simple 12V Setup: 2-wire design with power and ground for easy connection.
Tight, Clean Mount: Foam gasket seals out moisture on surface-mounted installs.
Road Legal: Meets DOT and FMVSS 108 standards in any 360-degree position.

Features to know about

Brighter Night Maneuvering: 42-Diode LED Output

Low visibility when reversing can be a real headache. This round LED backup light delivers a powerful, even beam from its 42 diodes, putting out strong illumination that cuts through the dark. With a 7" diameter clear lens over white LEDs, it’s certified for backup use in a 2-lamp system and meets DOT and FMVSS 108 requirements. The high diode count spreads light evenly across a wide pattern, making it much easier to see behind you when backing up or positioning your trailer at night.

Built for Harsh, Wet Conditions: Fully Submersible, Sealed Construction

Water intrusion ruins lights fast, but this one is made to take it. The housing and lens are sonically sealed into a single waterproof unit, keeping out moisture and debris even when submerged. The foam gasket forms a weathertight seal against the mounting surface, so whether you’re backing into the water or towing through rain, the LEDs stay dry and protected. It’s a tough light built for long life in demanding environments.

Reliable and Efficient: Long-Lasting LED Technology

No one likes replacing bulbs or dealing with weak filaments. These LEDs last up to 50 times longer than incandescent bulbs and draw less power—only 0.301 amps at 12.8V—while delivering brighter light output. That efficiency means less strain on your wiring and battery with dependable illumination every time you hit reverse. No bulbs to replace, just solid performance that keeps working season after season.

Simple Surface Mounting: Easy Fit and Weather-Tight Seal

Installation doesn’t have to be complicated. This surface-mount design lines up with standard spacing—6-1/4" center-to-center between mounting holes—so you can bolt it down quickly without custom work. The 2-wire design makes wiring straightforward: one power lead and one ground wire. Hardware isn’t included, but once mounted, the foam gasket keeps things sealed tight against the elements for reliable operation in all conditions.

Specs

Dimensions

Overall diameter: 7"
Overall depth: 1-7/16"
Distance between mounting holes (center on center): 6-1/4"

Technical diagram of Optronics LED backup light showing round 7-inch diameter and depth measurements for surface-mount installation.

Electrical

Power draw at 12.8V: 0.301 amps
Voltage: 12V DC

Lighting

Diodes: 42
Lens color: Clear
LED color: White

Construction

Mount type: Surface mount
Housing material: Polycarbonate
Lens material: Polycarbonate
Waterproof rating: Sonically sealed, submersible

Warranty

LED warranty: Lifetime

BUL90CB Optronics 12V LED Backup Light for Transit Vehicles - Submersible - 42 Diodes - Round - Clear Lens

Alternate part number: BUL-90CB

Customer Satisfaction Score:

97% were satisfied with this product

3% of customers were not satisfied

Product did not meet expectations

3% of customers were not satisfied

Product did not meet expectations

4.7

301 reviews

5 Stars		(258)
4 Stars		(21)
3 Stars		(9)
2 Stars		(5)
1 Star		(8)

by: Michael 02/01/2018 One Year Later

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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by: Dylan J. 06/27/2020 One Year Later

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: Matthew H. 12/26/2016

The pictures speak for themselves !! Couldn't be happier Just gotta get the taillights that match now. STL190RB

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by: Jack 08/10/2019

Bolt mount location was the same as a replaced Whelen product making for an easy replacement. Time will tell on longevity in a wet location. Price seems reasonable.

by: Ryan 08/09/2023

Etrailer has always been a big help for our lighting needs.

by: Joshua 03/04/2018 One Year Later

We love all the products we have purchased. Well designed and very easy to install.

by: Shane Tackett 09/27/2012

Shane One Year Later

3/28/2014

Lights have been in service on a fire engine for over a year and doing great. Very good product

by: David M. 08/04/2012

The light is not too bright. Make a good some light or compartment light.

by: andy 08/07/2016

I put these on the rear of our fire truck, very bright!

by: Ryan 05/02/2026

by: Doug 07/12/2022

They are going to work for what I need

by: Susan 11/15/2017

Great

by: Robert 01/23/2023

by: Doug 08/12/2022

by: Sherman 07/03/2026

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: Jeffrey 10/11/2026

Second set I have purchased, perfect for my application which was an odd size. Great quality

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Kate F.

10/13/2026

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

by: Seadog 08/18/2026

Perfect replacement for the reverse lights on boat trailers. A better buy than ordering from the trailer company.

by: Scott 03/23/2025

Just what was needed to brighten up the rear of my horse trailer when loading and unloading in the dark

Scott One Year Later

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: ConnerCattleCompany 08/11/2016 One Year Later

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: Bruce S 03/16/2017

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. One Year Later

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: Steve 05/03/2017

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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by: Todd R. 11/20/2018

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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by: Fred Gordon 03/30/2018

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: Rick 10/21/2026

Nice and bright! Fits my needs.

by: Mike 08/27/2026 One Year Later

Looks and works good

301

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Info for this part was:

Written by:

Tyler C

Expert Research:

Michael H

Updated by:

Brian T

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