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Combination LED Trailer Tail Light - Submersible - 7 Function - 14 Diodes - Driver Side
(1346 reviews)
Price: $21.30
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Combination LED Trailer Tail Light - Submersible - 7 Function - 14 Diodes - Driver Side
Part Number: STL9RB
In Stock
$21.30
Retail:$23.08
You Save: 8%
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- All Info
- Reviews (1346)
- Q & A (0)
- Photos
Optronics Trailer Lights - STL9RB
- Tail Lights
- Square
- LED Light
- Red
- Brake/Tail/Turn
- License Plate
- Marker
- 5L x 5W Inch
- Submersible Lights
- Surface Mount
- Optronics
5-1/16" x 4-9/16" Square. Waterproof trailer light serves 7 functions: stop, turn, tail, rear reflex, side marker, side reflex, and license plate light. Durable plastic housing. Stud mount on 2" centers. 3-Wire design.
Features:
- Square trailer light serves 7 functions
- Stop light, turn signal light, tail light, rear reflex reflector, side marker light, side reflex reflector, license plate light
- Built-in reflex reflector removes the need for a separate reflector
- Sealed, waterproof construction is submersible
- Durable surface-mount technology (SMT) construction of LED circuit board
- Better withstands shock and vibration
- Allows for improved heat distribution
- LEDs make great replacements for incandescent lights
- Last 50 times longer
- More efficient - provide better light with less power output
- No bulbs to replace - no brittle filaments
- Molded plastic housing and durable acrylic lens
- Red lens over white LEDs
- Stud mount with included hardware
- 3-Wire pigtail
- White wire is the ground
- Brown wire is for the tail lights
- Yellow wire is for the stop and turn lights
Specs:
- Configuration: driver's side
- Passenger's side: STL8RB (sold separately)
- Dimensions: 5-1/16" wide x 4-9/16" tall x 2-5/8" deep
- Light face: 4-9/16" wide x 4-9/16" tall
- Distance between mounting studs (center on center): 2"
- Diodes: 14
- Power draw at 12.8V:
- Stop light: 0.259 amps
- Side marker light: 0.062 amps
- Lifetime warranty on LEDS
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 circuit board is sealed, which means that water will not damage the diodes or circuit board.
STL9RB Optronics Combination LED Taillight with License Plate Illuminator for Trailers Under 80" - Red lens - 14 Diodes
Alternate part number: STL-9RB
Customer Satisfaction Score:
99% were satisfied with this product
1% of customers were not satisfied
- Arrived Damaged
- Wrong item was ordered
- Did not arrive in time
Ratings & Reviews
4.8
1346 reviews
by:
Rick
10/10/2026
I converted the original incandescent bulb tail lights on my utility trailer to these. Size and mounting posts were identical to the originals. The originals were a 2 wire setup with no ground. I grounded the new light to the mounting post on the light and hooked the brown wire on the light to the brown on the trailer wiring and the colored wire on the light to the colored wire on the trailer wiring. Simple as that and everything works perfectly including the front marker lights on the trailer, which are still incandescent. Great lights and they are waterproof.
by:
Doug
03/29/2026
I’ve bought two trailer lights, one a few years ago, both have worked without fail. The company emailed me for feedback a year after I bought my first light. No company has ever done that. I was impressed they cared about the lasting quality of their product. 5 stars.
by:
Melvin
02/19/2026
I bought the passenger side one to replace an older, broken tail light. It was so good, I immediately ordered the driver's side to have a matched pair!
by:
Don
06/21/2017
Perfect replacement for factory installed lights.
Was able to use factory drilled mounting holes.
Installed in less than 45 minutes. Much brighter than original lights. I believe that they should provide many years of trouble free use.
Was able to use factory drilled mounting holes.
Installed in less than 45 minutes. Much brighter than original lights. I believe that they should provide many years of trouble free use.
Don
6/21/2018
Its been about a year, the lights have gone through all four seasons here in Minnesota and continue to function flawlessly. They have been a great investment saving me the time and effort needed to replace light bulbs.
by:
Andrew
07/19/2026
Nice and bright! Worked out great on my trailer.
by:
Andrew
04/13/2025
Fit perfectly where the old lights were. Perfect replacement.
Brooke M.
4/14/2025
So happy to hear that! Thanks for sending a photo too. They look great!
by:
Raymond
12/27/2024
Installed the new lights today. Easy peasy. I grew up on a farm, in the country, and have been fixin' and futchin' with trailer lights since I was 6, it seems (I'm 74 now). Hopefully this is the last time I'll need to fix the lights on this particular trailer.
by:
Donald
10/25/2026
Good quality. Fair price. Easy to install. Works well.
by:
Brad
11/05/2026
High quality product
by:
Mark
10/03/2026
Works great!
by:
Bryan
04/20/2024
Beautiful tail light. Very bright for the brake and turn signal. Fitted it on the back of my trailer with an L bracket.
by:
Brian
04/24/2026
Very bright out of the 2 led options for this type light get this one its brighter
by:
Karl
08/26/2017
Had to replace the tail light on my motorcycle trailer that vibrated and broke on my last trip (different manufacturer). Just completed a 500 mile trip, including periods of rain. No problems at all. Grat product.
by:
Brian
12/15/2022
Nice and bright , worked great for my flatbed upgrade .easy website and easy shipping. Ordered from this company for a few years and have never had an issue
by:
Andy
09/05/2026
Great product at a great price.
by:
Glen
10/06/2024
Perfect fit for my trailer.
Glen
10/7/2025
The lights look and work perfectly. No issues
by:
Joseph
05/02/2025
I love the light! It was an identical replacement of the one I had which was broken at the marina where I had the boat serviced last fall. I didn't notice the damage before I stored it this past winter. It had to be replaced. The brightness of these lights is astounding. I had to have one just like the one that was broken.
Gwendolyn Y.
5/3/2025
This is awesome, Joseph! It's always nice to find that perfect fit so that everything still looks the same, just new!
by:
Robert
04/10/2018
Very impressed! Ordered the STL9RB and the other side twin STL8RB. Etrailer shipped the wrong twin. One phone call and 5 minutes later, the correct part was shipped!
The LED tail lights and side markers (MCL82ADB Optronics LED Surface Mount Marker/Clearance Lights with Reflex) are for a home-built cargo trailer. Decent build, waterproof, and the plastic is of a heavy gauge to last a long time in the Arizona sun. These units are equipped with LED's, and should last a long time.
Thanks etrailer!
The LED tail lights and side markers (MCL82ADB Optronics LED Surface Mount Marker/Clearance Lights with Reflex) are for a home-built cargo trailer. Decent build, waterproof, and the plastic is of a heavy gauge to last a long time in the Arizona sun. These units are equipped with LED's, and should last a long time.
Thanks etrailer!
Robert B.
4/10/2019
One year in, and tail lights are still holding up well in the Arizona sun . . . . . :-
by:
John R.
11/06/2017
Very nice lights for the price. They were easy to install and the mounting bolts fit right into my existing holes from my "different brand" lights that were damaged. They are very bright! Not sure if they are "truly" submersible like the add says, as the wires simply go through a manufactured hole in the back of the case, so the wiring inside must be sealed. Either way, I just filled this hole with some regular silicone caulk. As with all trailer lights I would recommend buying or making light guards, as these lights can break easily. Overall I am happy and would definitely recommend!
John R.
11/6/2018
Thank you! The lights are great, no issues at all, and tough as nails!!! I have them on a 10k 6x10 dump trailer, that I beat the snot out of, gravel logging roads, mud, snow, ice, driving through brush. I just wish my trailer tires were as tough as those lights. Thanks again, and if I ever need anything for my trailers, I will be shopping etrailer!!!
by:
Jim
12/10/2017
Installed this and several other lights on a new trailer. Factory lighting and wiring left a lot to be desired, and with the help of etrailer.com I was able to get everything fixed up like I wanted.
Lights work very well - clear and bright red tail and turn/brake lights.
Lights work very well - clear and bright red tail and turn/brake lights.
Jim
12/10/2018
All of the products I purchased its been about 2 years now are still working great. Thanks for checking in.
by:
David V
04/20/2020
I installed lights on boat trailer in May 2019...
Launched boat several times with water covering lights.
Stored boat and trailer outdoors all winter of 2019/2020.
April 19, 2020 I took boat and trailer to marine shop for maintenance.
LIGHTS WORKED WITHOUT AN ISSUE!
Thank you for selling a reliable, quality product!
Launched boat several times with water covering lights.
Stored boat and trailer outdoors all winter of 2019/2020.
April 19, 2020 I took boat and trailer to marine shop for maintenance.
LIGHTS WORKED WITHOUT AN ISSUE!
Thank you for selling a reliable, quality product!
David V.
4/21/2021
Lights still work perfectly after heavy snows during 2020 2021 winter outdoor storage.
by:
Winsel S.
11/12/2015
Looks Great! Works Great! These were added to a 14' Kaufman Dump Trailer that I wanted to use as a utility trailer also, but when completely tarped, the brake/tail/turn lights were covered. So, I added these lights to the side of the frame so that they could be seen when the trailer was securely tarped.
Winsel S.
12/31/2016
I still love the products purchased
by:
Bruce
02/22/2018
STL9RB & STL8RB Trailer tail-lights. Removed old standard bulb tail-lights, from my small "runaway" camper trailer, and replaced them with these LED tail-lights. The LED lights are much brighter than the old lights. Installation was easy. Followed the instruction video. It took me about twenty minutes from start to finish. They work great and look great.
Bruce
2/22/2019
Still working great.
by:
Kevin
10/09/2025
Nice product fast shipping. Installed today. Trailer is back to normal
by:
Mark D
09/02/2025
Disappointed, light arrived with broken lens. Then tried to call customer service. No answer. Then emailed, no response.
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view full answer... - Why Does the Optronics Driver Side Tail Light STL9RB Have More Diodes Than the Passenger Side STL8RBThe reason that the Passenger Trailer Tail Light # STL8RB has 11 diodes and the Drivers Side # STL9RB has 14 diodes is because the driver side light has an additional function; license plate illuminator. This is why you see a difference in the amount of diodes. I have attached a picture of the underside of the driver side light so you can see the license plate illuminator. I have attached some review videos as well as an installation video for you to check out.
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view full answer... - What is the Function of the White Wire on LED Trailer Tail Light # STL8RBThe white wire on the LED trailer tail light # STL8RB is the ground wire. It will need to attach to a clean and corrosion free bare metal surface. I have included a link to a video review of this light for you. The matching left side tail light is # STL9RB.
view full answer... - Why is the Left Hand Light More Expensive than the Right Hand Light?The left hand taillight is more expensive because it contains more LED lights than the right side, due to the addition of the license plate light on the bottom of the light. The white LED is more expensive to produce also and that adds to the cost of the left hand light because the license plate lamps are white.
view full answer... - Submersible Right Hand LED Trailer Tail Light RecommendationIf you want a submersible tail light I would recommend the LED Submersible Trailer Stop, Turn and Tail Light, 6-Function, 11 Diode, Right Hand, part # STL8RB. The # STL28RB you referenced is not submersible, and I would not recommend it if you need a submersible tail light. You may also be interested in the LED Submersible Trailer Stop, Turn, Tail and License Plate Light, 7-Function, 14 Diode, Left Hand, part # STL9RB, if you needed the left hand version of the # STL8RB.
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- What Gauge Wire on Optronics LED Combination Tail Lights STL9RB and STL8RBThe Combination LED Trailer Tail Light - Submersible - 6 Function - 11 Diodes - Passenger Side # STL8RB and # STL9RB has 16 gauge wires. You will want to use connectors like the Deka Butt Connector - 16-14 Gauge - Qty 5 # 05731-5.
view full answer...
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Mike L.
2/19/2026
Niiice! Glad to hear your taillights are working well for you!