LED Trailer Turn and Parking Light w/ Flange - Submersible - 10 Diodes - Round - Amber Lens

LED Trailer Turn and Parking Light w/ Flange - Submersible - 10 Diodes - Round - Amber Lens

Item # STL43ABX

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Trailer Lights STL43ABX - Turn,Parking,Rear Reflector - Optronics
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5-3/4" Diameter round. Waterproof, LED trailer light provides turn signal and parking light. Built-in reflector. Durable polycarbonate housing and lens. Surface mount with built-in flange. Accepts industry standard 3-prong plug. Lowest Prices for the best trailer lights from Optronics. LED Trailer Turn and Parking Light w/ Flange - Submersible - 10 Diodes - Round - Amber Lens part number STL43ABX can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (9)
  • Q & A (3)
  • Videos (1)
  • Photos
  • Why etrailer?

Optronics Trailer Lights - STL43ABX

  • Tail Lights
  • Round
  • LED Light
  • Amber
  • Surface Mount
  • 4 Inch Diameter
  • Submersible Lights
  • Optronics
  • Turn
  • Parking
  • Rear Reflector

5-3/4" Diameter round. Waterproof, LED trailer light provides turn signal and parking light. Built-in reflector. Durable polycarbonate housing and lens. Surface mount with built-in flange. Accepts industry standard 3-prong plug.


  • Round LED trailer light serves as a parking and rear-turn signal
  • Sonically sealed, waterproof housing and lens unit is submersible
  • Built-in reflex reflector removes the need for a separate reflector
  • 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
  • Amber lens over white LEDs
  • Compatible with 12V DC systems
  • Surface mount to trailer with built-in flange
  • Accepts industry-standard, 3-prong plug (A45PB or A47PB - sold separately)
  • DOT compliant
    • Meets FMVSS 108 requirements in any 360-degree position


  • Dimensions: 5-3/4" diameter x 1-5/8" thick
  • Distance between mounting holes (center on center): 4-7/8"
  • Diodes: 10
  • Power draw at 12.8V:
    • Stop/turn: 0.413 amps
    • Tail: 0.026 amps
  • Lifetime warranty on LEDs

Optronics STL43 Reflex Flange LED Parking Turn 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.

STL43ABX Optronics LED Trailer Turn and Parking Light w/ Mounting Flange - Reflex Reflector - Submersible - 10 Diodes - Round - Amber Lens

Alternate part number: STL-43ABX

California residents: click here

Video of LED Trailer Turn and Parking Light w/ Flange - Submersible - 10 Diodes - Round - Amber Lens

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Optronics Trailer Lights - Tail Lights - STL43ABX Review

Today we're going to be reviewing part number STL43ABX. This is the LED Amber trailer light from Optronics. The Amber trailer light is going to serve 2 functions on trailers that are less than 80" wide such as your parking and rear turn signal. The long-lasting, super-bright LED is a great system to have. It's going to be a great replacement for incandescent lights. It's going to feature a multi-diode design that's going to optimize your light output.

You also don't have to worry about replacing any bulbs or brittle filaments. These are going to be more efficient, which means they're going to provide a brighter light using less power. It's got the built-in reflex reflector that goes around the perimeter of the light. It's going to feature a sealed, waterproof, 1-piece molded plastic housing and durable lens unit. It's going to be a very corrosion resistant. It's also going to include this nice rubber gasket.

This is included to create a weathertight seal against the mounting surface. You can see here at the plug on the back of the light, it's designed to accept your industry-standard 3-prong plug; that's going to be sold separately. You can find those right here at etrailer.com. If you want a right angle plug, you can use part number A47PB; or if you want a straight plug like I'll be using in the demonstration today, you can use part number A45PB. This is Department of Transportation compliant.

It meets FMVSS 108 requirements in any 360-degree position. It's a nice round shape and if we take a look at the overall diameter, measuring from edge to edge, it's going to give us a measurement of 5-3/4". Just the light, measuring the internal portion just right inside that reflector area, it's going to give us a measurement of 4-3/8"; and then center on center, the distance between the mounting holes is going to measure 4-1/4". It's going to contain 10 diodes, which are going to be your LEDs. The power draw is 0.310 amps at 12.8 volts and it is a flange mount installation and again, it is going to come with that rubber gasket. We're going to go and hook it up to our external power source that way you can see what it looks like with power running to it and with our overhead lights turned off. We're going to take the 3-prong plug; we're going to fit it into the connection points.

You can see here that it's going to send out a nice, consistent LED signal; this is going to be for the parking light function. Then when we apply our rear turn signal, you can see how it illuminates for a brighter signal, sending out a really strong, consistent LED. The Amber LED lights are really nice. It comes through that Amber colored lens really well and again, it's just going to provide a nice, bright, consistent signal. That's going to do it for our review of part number STL43ABX. This is the LED Amber trailer light from Optronics. .

Customer Reviews

LED Trailer Turn and Parking Light w/ Flange - Submersible - 10 Diodes - Round - Amber Lens - STL43ABX

Average Customer Rating:  4.7 out of 5 stars   (9 Customer Reviews)

5-3/4" Diameter round. Waterproof, LED trailer light provides turn signal and parking light. Built-in reflector. Durable polycarbonate housing and lens. Surface mount with built-in flange. Accepts industry standard 3-prong plug.


package arrived safe and sound. the item was securely packed inside the box, as well, with bubble wrap. exactly the correct part. we will order from your site again for future needs. thank you 652322


The lights are good but them not coming with the wiring is unbelievable. Why sell lights without a way to hook them up. 461563


Natthan,Thank you for your review. You will need an industry standard 3 prong pigtail to wire this light. Part STL43ABX will work for you.

-- Heather A - 12/20/2017



Light was for a fourteen passenger bus. It was an exact match and fit. 441556


The fit was perfect and I have not had any problems with this Item. etrailer was great to work with. 377935


This product is still going strong and was a Great purchase. Would buy again for sure. Thanks etrailer.

Steve M - 05/09/2018



Spent over 8 hours looking for these same exact lights before I put my bus on the road for inauguration. Went to dozens of bus dealers, and part vendors, but i couldn't even find similar. Even called the manufacture, but they advised since i wasn't a distributor, they couldn't sell to me directly, neither did any of there distributors have it. Make a long story short, etrailer saved my butt! 333457


Excellent 202718


PERFECT!!! The light was exactly what the picture shows and the dims were spot on. The light is all solid and the flange mount it very sturdy. We installed these on our MCI MC9/12 buses and have had no complaints. The wired right in to the current system with no issues. We will continue to purchase more of these in the future. 157254


The LED lights STL43ABX you bought for your MCI bus are 12 volt. How did you connect them to your 24 volt MCI system?

-- comment by: Paul - 03/05/2015


Oftentimes, the circuits for the exterior lights are regulated down to a 12v circuit to make them compatiblie with the majority of lights on the market. You can always use a volt meter and test the wiring on one of your lights to see if it is a 12v or 24v circuit. If need be, there are some Optronics LED lights that are designed to function on circuits that range from 9-30v.

-- Patrick B - 3/9/2015


easy ordering and the product was ship and delivered very fast. will use again with great pride 135495


I received the lamps in excellent condition.I thought the young lady that took my order was excellent.I'll do business with them again.I put etrailer down as a favorite.I also look forward in doing business with them in the future because they treated me with respect on the phone.The price was good also. 68862


Ask the Experts about this Optronics Trailer Lights

Do you have a question about this Trailer Light?

  • Converting Separate Turn Signals and Brake Lights to Combined Turn and Brake Lights on a Trailer
  • If the trailer is one that is pulled by a motorcycle or a trailer designed to carry a motorcycle, you will need a converter in order to convert the wiring system used by the 6-Way to a 2 wire system used by trailer lights. The converter you can use is # RM-732. This takes the separate turn and brake signals and makes them a combined circuit. When you hit the brakes with the turn signal on, it should blink on one side and the other side will remain a solid brake light. The converter will...
    view full answer...

  • Recommendation of Turn Signal and Parking Light for Off-road use
  • I recommend the amber trailer turn signal and parking light # ST70AB as it's sealed and waterproof. The rubber grommet # a70gb will provide shock mount protection extending the life of the lamp. The Optronics # MCL157AB could possibly be used as a turn signal but not recommended. The grommet you referred # A56GB would work as it will provide shock protection especially that you will be off-road. It will seat properly once the light is plugged into the grommet. The LED equivalent...
    view full answer...

  • 4 inch Diameter Round Pedestal Mounted Trailer Light Availability
  • The closest thing we have to what you need is the part # STL52ARB. This is a pedestal mounted round LED light that measures 4-1/4 inches in diameter. It has a red and amber side on it so hopefully it would work for your application. I attached a review video for you to check out as well.
    view full answer...

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Info for this part was:

Written by:
Tyler C
Updated by:
Sarah W
Updated by:
Brian T

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