2020-2022 Super Duty Reverse (4257 LumX-FC)

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  • Regular price $69.99

  • Description
  • Specs
  • Reviews


Will NOT work on Super Dutys with OEM LED Tail Lights

Fan Cooled Technology in a replacement bulb! 

(Sold as set of 2 Bulbs)


LumX has been pushing the boundaries of what is possible when it comes to external LED bulbs. While other manufacturers focus on headlight bulbs, we're trying to create extremely bright, efficient replacement bulbs for other applications. 


The LumX FC series is the latest example of this push. We packed 50 separate EMC LED chips onto this one bulb! This creates a staggering 2000 Lumens PER BULB! This would not be possible without an efficient cooling method. For this we designed, from what we've seen, to be one of the first reverse lights with a built-in electronic fan to cool the bulb! 


There are certain applications where our normal heat sink cooled reverse light set will not work. For those applications we've created the FC series! "Fan Cooled"


This creates an extremely universal bulb that will work on any application where the socket fits! 


Bulb plugs into a circuit base? ☑️

Vehicle have blind spot monitoring? ☑️

Long as its a 4257 base, this bulb will fit ☑️



Socket Type4257

Cooling Method - LED's cooled by electric fan mounted on top of bulb

Fully Integrated CanBus - ERROR FREE (Will not cause error messages on dashboard or flicker)

Lumens - 2000 Lumens Per Bulb 

Color - 6000K Pure White (No Blue Tint)

LED Chips  - EMC-2016

Warranty - 1 Year 

Voltage - DC 9V-20V

Lifespan - 30,000 Hours


Power - 21.6~28.8W

Customer Reviews

Based on 13 reviews
Richard Ortiz
Greta product and customer service.

The lights arrived super fast! The packaging was very nice and I was extremely impressed. UNFORTUNATELY, my truck had factory LEDs and I didn’t read that they would not fit. I took off my tail light to find a closed system and no way to install individual lights. I contacted Dieselleds and they were happy to accept the product back for a full refund. I’ll definitely be using this company in the future.

Tadd B
Very Bright reverse lights

I hook up and haul a variety of trailers, often at nighttime or early morning hours. These simple additions make the process of seeing trailers much easier

James Brown
bright enough

Bought these to see if they would help backing up in the rain at night, they did. Also found that when I put the truck in reverse people take notice in parking lots and such whereas no one really paid much attention before. These Reverse lights are bright and they work well .

Duncan Arms
Back up lights

Got the 4257 reverse lights. Work real bright

Robert Dee Jr
Great Lights

Makes a big difference. Now I can see behind my truck. Highly recommend