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Backing up in the dark doesn’t have to be a guessing game. This 4-5/16" round Optronics LED backup light uses 10 white LEDs behind a clear lens to throw a clean, bright light where you need it. At 24 volts, it only draws 0.260 amps, delivering strong illumination with minimal power use. The multi-diode design optimizes output so you get full, even coverage instead of hot spots or dim edges.
Rain, washdowns, or full submersion won’t slow this light down. The sealed, waterproof, one-piece molded housing and durable lens keep water and corrosion out. Its water-blocking construction works with a weatherproof plug connection on the back for a secure seal against moisture. Whether it’s exposure to road spray or repeated dunking, the LEDs stay protected and shining bright.
Installing this light is simple and solid. It mounts flush using a grommet (A45GB – sold separately) and connects through a weathertight plug that locks moisture out. Once in place, the fit is clean and low-profile—no bulky housings sticking out or snagging on gear. With no bulbs to replace and no fragile filaments to break, you can set it up once and count on it for years.
You can count on this light to meet lighting standards across any installation angle. It’s DOT compliant and meets FMVSS 108 requirements in any 360-degree position when used as a pair in a 2-lamp system. That means dependable performance that keeps your setup safe and legal wherever you go.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Today we're going to be taking a look at part number BUL11CM24B. This is the Optronics LED backup light. This is going to work well on a trailer or utility truck. It's going to provide a white reverse light. This is certified for backup light function when installed as a pair in a two-lamp system. The unit's designed for 24 volt system.
It's going to feature long-lasting LEDs. LEDs are going to make a great replacement for incandescent lights. It's got the multi-diode design so it's really going to help optimize your light output. You don't have to worry about replacing bulbs or brittle filaments and the LEDs are going to be more efficient which means they're going to provide brighter light while using less power. This unit's going to feature a nice sealed water-proof one-piece molded plastic housing and durable lens. It's going to feature a corrosion resistant design, very strong construction, water-proof connection here on the back of the light.
So it's going to use a water-blocking design. This is going to help keep moisture out. So the plug that goes with this system is going to be available and sold separately part number AL45PWTB and that goes right inside this connection point there. It's got the locking tab on one end to provide the nice, tight, secure connection. It does require a mounting grommet and the plug for complete installation.
Those items are sold separately and you can find both of those on our website. It's SAE and Department of Transportation compliant. It meets FMVSS 108 requirements in any 360 degree position. We're going to go ahead and take a look at a few of the measurements real quick. First thing's going to be the diameter of the light measuring from edge to edge. That's going to give us a measurement of about 4 and 5/16ths of an inch.
We'll take a measurement of the depth from the front of the lens to the back of the plug. We're going to be looking at 1 and 5/8ths of an inch. We just measured the thickness of the lens, we're looking at about 7/8ths of an inch. This light's going to contain 10 LEDs or 10 diodes, so again, the multi-diode design is really going to optimize our light output. It's going to give us a nice white light coming through the clear lens. It's going to allow a lot of light to come through. It's a flush runner installation with that grommet that's sold separately and Optronics is going to put a lifetime warranty on the LEDs. That's going to do it for today's review, part number BUL11CM24B. .
Ratings & Reviews
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.
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
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Kate F.
10/13/2026
What a unique application Jeffrey! Is this part of a kids train?