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Fusion LED Trailer Tail Light - Stop, Tail, Turn, Backup - Submersible - Round - Red/Clear Lens

Fusion LED Trailer Tail Light - Stop, Tail, Turn, Backup - Submersible - Round - Red/Clear Lens

Item # STL201RFMB
Our Price: $38.72
Trailer Lights
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Shipping Weight: 0.38 lbs
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Fusion LED Trailer Tail Light - Stop, Tail, Turn, Backup - Submersible - Round - Red/Clear Lens Stop/Turn/Tail/Backup STL201RFMB
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4" Round. Waterproof trailer light serves 4 functions: brake, tail, turn, and backup light. Red lens set inside clear lens. Recessed mount with built-in flange. Accepts 2-prong plug for backup and 3-prong plug for tail light. 24 Diodes. Great Prices for the best trailer lights from Optronics. Fusion LED Trailer Tail Light - Stop, Tail, Turn, Backup - Submersible - Round - Red/Clear Lens part number STL201RFMB can be ordered online at or call 1-800-496-5010 for expert service.
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  • Reviews (17)
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Optronics Trailer Lights - STL201RFMB

  • Tail Lights
  • Round
  • LED Light
  • Red and White
  • 4 Inch Diameter
  • Recessed Mount
  • Stop/Turn/Tail/Backup
  • Submersible Lights
  • Optronics

4" Round. Waterproof trailer light serves 4 functions: brake, tail, turn, and backup light. Red lens set inside clear lens. Recessed mount with built-in flange. Accepts 2-prong plug for backup and 3-prong plug for tail light. 24 Diodes.


  • Round trailer tail light with smooth, bright red outer band serves 4 functions
    • Stop light - outer band of light brightens and center LEDs illuminate
    • Tail light - outer band lights up
    • Turn signal light - inner ring of LEDs flashes
    • Backup light - center LEDs light up
  • GloLight lens creates a solid circle of light with a smooth appearance
  • Sonically sealed, waterproof housing and lens unit 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 brighter light with less power output
    • No bulbs to replace - no brittle filaments
  • Durable polycarbonate lens and housing
  • Red lens set inside white lens with red and white LEDs
    • Red lens with red LEDs for tail light
    • Clear lens with white LEDs for backup light
  • Recessed mount with built-in black flange - hardware not included
  • Accepts industry-standard plugs (sold separately)
    • 2-Prong plug (A42PMB - sold separately) for backup light function
    • 3-Prong plug (A45PMB - sold separately) for tail light functions
  • DOT compliant
    • Meets FMVSS 108 requirements for automotive lighting


  • Overall dimensions with flange: 5-1/2" diameter x 1-5/8" deep
    • Light face diameter: 4"
  • Diodes: 24
  • Power draw at 12.8 volts:
    • Stop/turn signal light: 0.316 amps
    • Tail light: 0.15 amps
    • Backup light: 0.3 amps
  • Lifetime LED warranty on LEDs

Optronics STL201RFMB LED M1 Series Millennium Series Sealed LED Clearance Diagram

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.

Weathertight Connection

Optronics Weathertight Connection

This light has 2 weathertight connections as pictured above - one for the tail light functions and one for the backup light. Weathertight plugs (A42PMB and A45PMB - sold separately) are designed to help connections block out moisture.

STL201RFMB Optronics Glo Light Fusion 4" Round Combination LED Trailer Taillight - Red/Clear Lens - Weathertight Plug - Black Flange

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Fusion LED Trailer Tail Light - Stop, Tail, Turn, Backup - Submersible - Round - Red/Clear Lens - STL201RFMB

Average Customer Rating:  4.8 out of 5 stars   (17 Customer Reviews)

4" Round. Waterproof trailer light serves 4 functions: brake, tail, turn, and backup light. Red lens set inside clear lens. Recessed mount with built-in flange. Accepts 2-prong plug for backup and 3-prong plug for tail light. 24 Diodes.


I love the products but the quality of the packaging was horrendous. When I opens the box up there wasn’t enough packing paper in the box to keep the lights from shifting in the box. Most of the lights were out of the low quality unsealed plastic bags and were a scratched and marked up. Along with that there weren’t any bags for the smaller 3/4”lights and were loosely thrown in the bottom of the box with the grommets not being attached in any way. After I pulled the contents out of the box I realized that there weren’t even enough crappy plastic unsealed bags for all of the main 4”and 6” S/T/T/B lights and to finish it off all the electric grease that was in the plugs was not covered in any way leaving all the bags and contents of the box completely covered in di-electric grease. Overall after cleaning all the lights up the products are amazing except for it took a little research to find out that the 4” STTB lights aren’t supplied with pigtails. I’m disappointed of the quality control for your company for the price that you ask.


Lights were exactly what I wanted very bright and great quality shipping was way faster than expected


Great looking light, on and off! Unfortunately they didn’t work on my 5th Rv , so I am looking for some thing to put them on!!!


PROS Nice Bright light. All Functions work well. CONS, would be nice if it came with a mounting gasket & the wiring weather tight plug-in pigtail needed to complete the wiring. Love the LED brightness just wish it came more complete ...plug & play.


I love the lights and the website so far but it bugs me that the lights didn't come with the plug pigtails. You shout raise the price of the light by whatever the cost would be for 1 and throw the other in for free or just throw them in for free . It's really nice to have them as a kit. Kits are key.


Nice i like it, good products , excellent parts!!


excellent product, installed them in my jeep TJ , love em..
sorry no pics.


Very bright. Perfect fit.






Great fit, excellent delivery time.


great product


Great product, came as described.




See what our Experts say about this Optronics Trailer Lights

  • Distance Between Mounting Holes of GloLight Clearance # STL201RFMB
    The distance between the mounting hole centers of the GloLight LED Trailer Tail Light # STL201RFMB that you referenced is 4-1/4 inches.
    view full answer...
    Image 1 for
  • Looking for STL201 Series GloLight 4 Inch LED Flange Mount Combination Stop/Turn/Tail/Back-Up Lights
    I have exactly what you are looking for, # STL201RFMB. This light is DOT-compliant, offers sonically sealed weathertight connections, and has a recessed flange mount design for secure installation.
    view full answer...
    Image 1 for
  • Function of Optronics GloLight LED Stop Turn Tail Backup Light # STL201RFMB
    I went out to the warehouse and pulled the Optronics # STL201RFMB light to test it out and see for you. I found that when you have the running lights on that the LED ring glows constantly. When you press the brake, the red LEDs and the red LED ring will be illuminated. If you were to turn on your blinker the ring would remain illuminated but only the red LEDs in the inner center ring will flash. There is also white reverse LEDs that will come on when backing up. The color of the casting...
    view full answer...
  • What Size Hole is Required to Install GloLight LED Trailer Tail Light # STL201RFMB
    To install the GloLight LED Trailer Tail Light # STL201RFMB that you referenced you would need to have a 4.5 inch hole cut in the trailer. The light portion of the assembly is 4.5 inches which would recess into the hole and the flange has an outer diameter of 5-1/2 inches.
    view full answer...
  • Installing a 2-Wire Combined Trailer Light on a Vehicle with 3-Wire Separate Wiring
    It sounds like you're trying to use trailer tail light, part # STL201RFMB, which is a 2-wire system on a vehicle that has 3-wire separate wiring. The light is designed as a trailer light, and trailers generally use 2-wire lights but the light can work on a vehicle with separate lighting if wired correctly using a converter. You need a converter like the Roadmaster Brite-Lite, part # RM-732, to combine the turn signal and brake light circuits on your vehicle. Connect your vehicle's brake...
    view full answer...
  • Is the Optronics 21 Diode LED Trailer Taillight the Brightest
    Since Optronics does not share information such as lumens, determining the brightness can be difficult to determine. Although not always the case, typically more diodes indicates that the light will be brighter. The # STL23RB Optronics LED Trailer Tail Light - Stop, Tail, Turn - Submersible - 21 Diodes - Round - Red Lens still has the most at 21 diodes which will make it one of, if not the most, bright red 4" stop, tail, turn lights. The only other 4" red light with as many diodes is...
    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...
  • LED-Type White Trailer Backup Light for Bass Tracker Trailer
    We do offer LED-type trailer lights with backup lights included, such as # STL211RB and # STL201RFMB, but none in the size/shape of # STL15RB. However, I can offer you an alternative. For a really bright and useful white LED backup light for your trailer you might want to consider a separate light such as the Optronics 42-diode surface-mount # BUL90CB. This 7-inch diameter round light will let you almost get a tan too if you want! Simple 2-wire connection to your reverse light circuit...
    view full answer...
  • Diodes of Fusion LED Trailer Tail Light
    The Fusion LED Trailer Tail Light # STL201RFMB is an LED with 24 diodes; it is a single light fixture that can function as a stop light, turn signal, tail light and backup light. This is one of the best LED trailer lights available due to its 24 diodes for optimum brightness; they also come with a lifetime warranty. The Fusion LED Trailer Light # STL201RFMB will require the use of both the 2-Wire Pigtail for Optronics Lights - Weathertight Plug # A42PMB and 3-Wire Pigtail for Optronics...
    view full answer...
  • Clearance Needed to Install LED Trailer Light # STL201RFMB
    I went to our warehouse and put together the light, part # STL201RFMB, with both the 3-wire, part # A45PMB, and 2-wire, part # A42PMB, pigtails. With both pigtails plugged in I measured abouut 2-1/4 inches from the front of the light to where the wires enter the connector. You need a little more space than this for the wires to have room to bend so I'd guess you want at least 2-1/2 inches at the very least.
    view full answer...
  • Availability of Reverse LED Trailer Lights
    We do offer a wide selection of LED reverse lights, though they are available individually as opposed to being included in a kit. You can select whichever size and shape best fits your needs; for example there is the Optronics # STL68RB, which is oval and measures 10-1/8" x 3-1/16". There is also the option of a circular light such as Optronics # STL201RFMB or rectangular Bargman # 47-84-008. I've added links to video reviews of these lights, as well as a link to our page with the entire...
    view full answer...
  • Which Pigtails Are Needed For The GloLight LED Trailer Light STL201RFMB?
    Yes, the Optronics GloLight LED Trailer Tail Light - Stop, Tail, Turn, Backup - Submersible - 24 Diodes - Weathertight, # STL201RFMB, uses two weathertight harnesses. The 3-Wire Pigtail for Optronics Trailer Lights - Weathertight Plug - 10" Lead, # A45PMB, will give you the running light, stop light, and turn signal funtions. The 2-Wire Pigtail for Optronics Lights - Weathertight Plug - 10" Lead, # A42PMB, will give you the backup light funtion. To connect these harnesses, I suggest...
    view full answer...

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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Laura H
Written by:
Laura H
Employee Cole B
Installed by:
Cole B
Employee Amy B
Updated by:
Amy B
Employee Brian T
Updated by:
Brian T
Employee Chris R
Video Edited:
Chris R

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