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Transit Tail Light - Stop/Turn/Tail - LED - Submersible - 31 Diodes - 12-24 Volts - Red Lens
Optronics

Transit Tail Light - Stop/Turn/Tail - LED - Submersible - 31 Diodes - 12-24 Volts - Red Lens

Part Number: STL90R24B
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$39.74
Retail:$54.00
You Save: 26%
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7" Diameter x 1-7/16" deep. Waterproof transit light serves 3 functions: stop, turn, tail. Weathertight gasket included. Surface mount on 6-1/4" centers. 3-Wire design. 12-24 Volts. 31 Red LEDs with a red lens and reflector. Great Prices for the best trailer lights from Optronics. Transit Tail Light - Stop/Turn/Tail - LED - Submersible - 31 Diodes - 12-24 Volts - Red Lens part number STL90R24B can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (32)
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Optronics Trailer Lights - STL90R24B

Highlights

  • One Light, 3 Functions: Provides stop, turn, and tail signals in one 7" round LED unit.
  • Reliable In Any Weather: Submersible, weathertight gasket keeps moisture and dust out.
  • Works on 12V or 24V: Dual-voltage design stays bright no matter your power setup.
  • Fewer Replacements Needed: 31 long-lasting LEDs use less power and never need new bulbs.
  • Easy Surface Mount: Installs on 6-1/4" centers with included gasket and 3-wire hookup.
  • Road Legal: Meets DOT and FMVSS 108 standards in any 360° position.

Features to know about

Bright, Efficient Upgrade: 31-Diode LED Stop/Turn/Tail Light

If you’re done replacing faded bulbs or weak lights, this 7" round LED tail light is a real step up. It uses 31 red LEDs to deliver strong, even illumination for stop, turn, and tail signals. The multi-diode design pushes out more light with less power draw—just 0.180 amps on stop and 0.086 amps on tail at 24 volts. It works on both 12-volt and 24-volt systems, so it’s ready for whatever electrical setup you run. No bulbs to swap, no filaments to break, just bright, consistent light every time.

Reliable in Any Weather: Fully Submersible and Sealed

Water and wiring don’t mix, but this light is built to handle it. The housing and red lens are sealed tight, making the entire assembly waterproof and submersible. A weathertight mounting gasket is included to keep moisture out where the light meets the surface. Even in rain, washdowns, or full submersion, the LEDs stay protected and clear.

Simple Mounting That Fits Right

You don’t need special brackets or odd tools to mount this one. The round body measures 7" in diameter and 1-7/16" deep, designed for easy surface mounting on 6-1/4" centers. The 3-wire design keeps things straightforward—lead wires for power and a ground wire—and makes it compatible with standard wiring setups. Installation is simple, clean, and dependable.

Built for Long Service: Durable LEDs with Lifetime Warranty

This light is made to last. The solid-state LEDs don’t suffer from vibration or shock like filament bulbs, so they keep shining strong through years of use. It’s DOT compliant and meets FMVSS 108 requirements in any 360-degree position. The LEDs come backed by a lifetime warranty, giving you long-term confidence every time you’re on the road.

Specs

Shape

  • Shape: round

Dimensions

  • Overall dimensions: 7" diameter x 1-7/16" deep
  • Mounting hole centers: 6-1/4"

Optronics Transit Tail Light STL90R24B showing red round LED lens with dimension lines indicating 7-inch diameter and 1-7/16-inch depth for surface mount installation

Electrical

  • Voltage: 12-24 Volts
  • Diodes: 31
  • Power draw (Stop): 0.180 amps at 24 volts
  • Power draw (Tail): 0.086 amps at 24 volts

Installation

  • Mount type: surface mount on 6-1/4" centers
  • Wiring design: 3-wire design

Warranty

  • LED warranty: Lifetime warranty on LEDs

STL90R24B Transit LED Stop/Side Marker/Tail Light - 31 Diode, 12-24 Volts - 7" Round - Red

Alternate part number: STL-90R24B





Customer Satisfaction Score:

Ratings & Reviews

4.6

32 reviews
Review sort icon
7" Diameter x 1-7/16" deep. Waterproof transit light serves 3 functions: stop, turn, tail. Weathertight gasket included. Surface mount on 6-1/4" centers. 3-Wire design. 12-24 Volts. 31 Red LEDs with a red lens and reflector.

by:

ARRIVED TODAY GOOD SHAPE THANK YOU



by:

Great.



by:

Easy to install look great sealed very well



by:

Has not faded and is still as vibrant with color



by:

Sat in warehouse for five day with no movement after label was created waiting for pickup. Called to inform them it hadn’t moved and guy on phone blamed usps did not scan packages on pick up.



by:

Having not installed these lights I can only comment on the fact that they look well constructed and are almost identical in size to the lights that came off of my 1962 Airstream Ambassador. They do not mount in the same manner but will cover the holes easily making these a good choice for replacing my old broken fixtures.



by:

Perfect replacement for my original.



by:

Just what I was looking for a 7 inch LED lamps for my motorhome



by:

Great buying experience, highly recommend etrailer. Excellent product.



by:

I actually thought they were going to be two lights in the box. I needed to love them. I would like to order another one, but I’d like to make sure it gets here quickly. I don’t think it was clear in the description that there was only one white. It didn’t say to either, so my mistake in assuming



by:

This light works great We have replaced about 30 so far with this LED unit. Much brighter, sealed. A quality item. It is being used off road in a construction environment.



by:

Bought these for a vintage Airstream. I was initially afraid they may not be bright enough on 12 volts, but after installung them if they were any brighter they would be distracting. I'm very pleased with them.



by:

Hi e trailer .,, thanks- Airstream parts are hard to find. good job. Mike



by:

Good quality, bright led light. Easy to install

Patrick J. profile picture

Patrick J.

4/6/2019

Still working great, very bright and very durable light.



by:

Absolutely great very bright and easy to mount. You can truly tell a difference from tail light to brake light when you push the brakes.



by:

Great service. Had an issue with the marker lights and replacements were sent out without question.



by:

Excellent...
My old Airstream had 6"
dia. lights and thes 7" dia ones fit perfectly.

Kenny U. profile picture

Kenny U.

6/7/2016

All still fantastic



by:

FYI - The item I received had 12v/24v on a sticker (mfg) on the back of the light so it is a dual voltage lite.

Banshee profile picture

Banshee

8/11/2016

Perfect Quality - Cant beat this companies products as when I look for lights I make sure it is THEIR products before I buy!



by:

I installed these on an 1978 MCI bus. Only used the brake light part of the light, much brighter brake lights than the original bulb type. Every thing lined up no problems.



by:

I was looking for a tail light for a trailer that would operate on both 12 and 24 volts. That way the trailer could be towed by a truck with either a 12 or 24 volt electrical system. There are ways to do it but this would be dead simple. The light is very bright. It appears to be well made.



by:

great product. Very bright



by:

These are good looking likes, I used them on my Scamp camper to replace 2 round fixtures, they are at least as bright as the factory fixtures if not brighter. My only note would be that they don't come with screws.

Jacob profile picture

Jacob

9/27/2016

They are still working great after a year and 4000 miles



by:

Yes I did buy a set of 24 volts trailer lights which I did install on my Challenger Trailer. This is a small trailer which I use when I go shopping which attaches to my Pride Handicap four wheel scooter.
After I installed them, I made a test and found out that I did have current up to the lights. But the lights did not work. I ended up ordering a set of tail lights from Pride.ca. They came installed in a rear panel for a scooter. Yes they work.
I decided to keep the lights I ordered from you. This was a learning experience. Or trial and error.
I thank you for your concern and yes, I would recommend your company for your automotive lights.
Have a nice day.



by:

Great light, very bright, and comes with a gasket to keep water out of my camper I am building!



by:

Light worked out perfect for what i needed. I was looking for a 7" light for a vintage camper i was fixing up and this light was perfect. Super bright and the quality is great. Should last many years to come.


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See what our Experts say about this Optronics Trailer Lights

  • Replacement Taillight Options for 1967 Airstream Caravel Trailer
    I have a solution for you, but we do not offer any vintage 575 lights. I was able to find that the 575 lights were round taillights that measured 7 inches in diameter. To replace your exisiting lights with those of the same diameter, we offer both incandescent and LED lights. Our most popular 7 inch diameter, round, red trailer taillight is the Optronics # ST90RB. This is an incandescent, sealed taillight. The three taillight options that come with LED lights are the Optronics # STL90RB,...
    view full answer...
  • 24V Lights Compatible With Prevost Coach
    Though The LED Trailer Clearance or Truck Cab Light # CBL22AB is only for a 12V system the only option we would have for you is to replace all the trailer lights on your trailer with lights that are compatible with 24V systems. We have a few select 24V taillights available for tail lights we have the Miro-Flex LED Trailer Tail Light # STL23R24B, The Transit Tail Light - Stop/Turn/Tail - LED - Submersible # STL90R24B. For Turn Marker Lights we have The LED Transit Turn Signal and Parking...
    view full answer...
  • Trailer Lighting Solution for Use with 24 volt and 12 volt Tow Vehicles
    The best option we have would be to switch the lights of the trailer to ones that can be used with 12 or 24 volts like the Optronics part # STL90R24B. This will be bright with either voltage setup. We do not have any voltage reducers at this time nor is that an ideal solution since you'd have to take them off half the time.
    view full answer...
  • Converting a Trailer with 12 volt Lights to 24 volt Lights for Compatibility with a Euro Spec Truck
    I think your only real option would be to replace the trailer lights on your trailer with lights that are compatible with 24 volt systems since there isn't an adapter available that we offer that would work for converting your 24 volt system to work with a 12 volt lighting system. Right now, we have a few select 24 volt tail lights. We have # STL23R24B and # STL90R24B. For turn/marker lights we have # STL90A24B and # STL23A24B. And for reverse lights we have # BUL23C24B.
    view full answer...
  • Option for Towing Trailer with 12 Volt Lights with 24 Volt Tow Vehicle
    I think your only real option would be to replace the trailer lights on your trailer with lights that are compatible with 24 volt systems since there isn't an adapter available that we offer that would work for converting your 24 volt system to work with a 12 volt lighting system. Right now, we have a few select 24 volt tail lights. We have # STL23R24B and # STL90R24B. For turn/marker lights we have # STL90A24B and # STL23A24B. And for reverse lights we have # BUL23C24B.
    view full answer...
  • 24 Volt Trailer Light Availability
    We have a couple trailer lights that are compatible with 24 volt circuits though. Check out the part # STL23R24B, # STL90R24B, # MCL55R1224B, or # SLL43AB2.
    view full answer...
  • 24V Trailer Taillight With Stop/Turn/Taillight/Reverse Lamp Function
    The Optronics # STL201RFMB LED trailer taillight you'd looked at is compatible with 12V systems only. For a 24V round surface mount submersible taillight, I'd recommend # STL90R24B. These taillights offer the stop/turn/taillight function, but not reverse lamps. We have a 7-1/2 x 3-1/4 inch oblong LED lamp, part # STL211XRFHB that is submersible, is a surface mount lamp and offers the stop/turn/running and reverse lamps. The lamp will work with 12 or 24V DC.
    view full answer...
  • Is Optronics Transit Tail Light # STL90R24B for 12V or 24V System
    The Optronics Transit Tail Light # STL90R24B that you referenced is actually designed to work with either a 12V or 24V system. If you have a 12V setup this light will still work perfectly. This is a really nice LED assembly with a weathertight seal to protect it from the elements. I have attached a short video review that you can check out as well.
    view full answer...
  • Round Tail Light for Use with 24 Volt System
    Yes, the Transit Tail Light part # STL90R24B will work on a 24 volt system. I called the manufacturer Optronics, to confirm this. If you need any butt connectors for installation I recommend part # DW05743-5. This light measures to be 7" diameter x 1-7/16" deep. It contains 31 diodes and has a lifetime warranty. I have attached a review video of the light for you as well.
    view full answer...
  • Comparing the Transit # STL90R24B and # STL90RB Tail Lights
    The difference between the Transit Tail Lights # STL90R24B and # STL90RB is that the former is compatible with 12V or 24V systems while the latter is only compatible with 12V systems. Aside from that they both use the stop/turn/tail functions, are LED, have 31 diodes, are submersible, and have the same dimensions.
    view full answer...
    Image 1 for
  • Tail Lights and Clearance Lights that Can be Used on Both a 12 Volt System and 24 Volt System
    For a tail light that can run off of 12 volt or 24 volt systems you can use Transit tail light # STL90R24B. For clearance lights you can use # MCL55A1224B for an amber light that works with 12 and 24 volt systems or # MCL55R1224B for a red light. For these lights use pigtail # A46PB and grommet # A54GB. Or for surface mount clearance/marker lights that are 12-24 volt compatible you can use # MCL66A24B for amber and # MCL66R24B for red.
    view full answer...
  • Trailer Lights Available for a 24V System
    We do have a handful of 24V trailer light options. For taillights, we have the Miro-Flex LED Red # STL23R24B, Miro-Flex LED Amber # STL23A24B, and Transit Tail Light LED Red Lens # STL90R24B. For clearance lights we have the Thin-Line LED Trailer Clearance/Side Marker Light, Red # MCL66R24B and Thin-Line LED Trailer Clearance/Side Marker Light, Amber # MCL66A24B. For backup lights we offer the LED Backup Light, 10 Diode, Sealed # BUL11CM24B, LED Backup Light, and the 27 Diodes, Sealed,...
    view full answer...
  • Availability of 24-Volt Tail Lights for Lowboy Trailer
    We do have some trailer tail lights designed to work on a 24-volt system. I recommend using light # STL23R24B. There are a few ways to mount this light. You can use a grommet and flush mount it in a 4-1/2 inch cutout using # A45GB. Or you can surface mount it with a bracket, # BK45BB. You will also use a wiring harness, # A47PB. These parts only come in red.
    view full answer...
  • How Many Lights Come With The Transit Tail Light # STL90R24B
    The Transit Tail Light # STL90R24B comes with one light. The light has 31 diodes and serves 3 functions stop, tail, and turn signals. The light has a weathertight seal with a mounting gasket which is included. The light is designed for a 12-volt or 24-volt system, and has a 3 wire design that includes the lead wires for power and ground wire. I attached a review video link below.
    view full answer...
  • Availability of 7 inch Diameter Trailer Taillight
    I attached a link to a page that has all of the 7 inch diameter taillights we offer like the Transit Tail Light # STL90R24B.
    view full answer...


Info for this part was:

Employee Tyler C
Written by:
Tyler C
Employee Jameson C
Expert Research:
Jameson C
Employee Amy B
Updated by:
Amy B
Employee Wilson B
Updated by:
Wilson B
Employee Brian T
Updated by:
Brian T
Employee Hannah L
Updated by:
Hannah L
Employee Noah M
Updated by:
Noah M

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