⚠ Will NOT work on Super Duty trucks with factory LED tail lights.
Fan-cooled power in a replacement bulb. Sold as a set of 2 bulbs.
Why LumX-FC
2,000 lumens per bulb. We packed 50 separate EMC LED chips onto one bulb. That output isn't possible without serious cooling, so this is one of the first reverse lights with a built-in electric fan.
Works where our heat-sink reverse set won't. Some housings don't fit our standard LumX reverse set, so we made the FC ("Fan Cooled") series for them.
Fits almost anywhere. Bulb plugs into a circuit board? Vehicle has blind-spot monitoring? As long as it's a 4257 socket, this bulb will fit.
Fits sockets: 4257
Cooling: Built-in electric fan on top of the bulb
CANbus: Fully integrated, error-free (no dash warnings or flicker)
Output: 2,000 lumens per bulb
Color: 6000K pure white (no blue tint)
LED chips: EMC-2016
Warranty: 1 Year
Voltage: 9–20V DC
Lifespan: 30,000 hours
Power: 21.6–28.8W
Rest Assured You're Covered
Many of our products come with a limited lifetime warranty! If our limited lifetime warranty is not listed it comes with our minimum 1 year warranty! We don't make you ship back the old bulb.We know your time is valuable. We don't want to ask you to waste it driving to the post office. Have a warranty issue? Contact our daily customer service and we'll get you taken care of!
These lights are incredible I can see everything even having tinted windows! And customer service is top notch
C
Collin Reeves (Phoenix, US)
Great bright lights
C
Charles Sanders (Birmingham, US)
2020-2023 Super Duty Reverse (4257 LumX-FC)
P
Peter Lorusso (Kansas City, US)
2020-2023 Super Duty Reverse (4257 LumX-FC)
j
justin hokinson (Cambridge, US)
They dont fit 2024
5 stars: 32 (94%)
4 stars: 0 (0%)
3 stars: 0 (0%)
2 stars: 0 (0%)
1 star: 2 (6%)
J
Jordon Brundige (Brockton, US)
LumX reverse lights
These lights are incredible I can see everything even having tinted windows! And customer service is top notch
C
Collin Reeves (Phoenix, US)
Great bright lights
C
Charles Sanders (Birmingham, US)
2020-2023 Super Duty Reverse (4257 LumX-FC)
P
Peter Lorusso (Kansas City, US)
2020-2023 Super Duty Reverse (4257 LumX-FC)
j
justin hokinson (Cambridge, US)
They dont fit 2024
M
Murray McDonald (New Smyrna Beach, US)
Super Duty Upgrade
I drive in mainly rural settings where deer, bear and an occasional cow cross the road in front of you. The factory lights just weren’t sufficient. I installed a full set of these lights and the difference is stunning. The visibility improvement is stunning.
G
Griffin Harris (Waldorf, US)
Led lights
They are great and work extremely well
R
Robert Morency (Woburn, US)
2020-2023 Super Duty Reverse (4257 LumX-FC)
N
Neil Morris (Greenville, US)
Very bright reversing lights
I have a 2022 ford f350 dually and the factory bulbs are considerably dim. I recently tinted my front driver and passenger windows to 20% tint to match my factory rear windows and it made it even harder to see when backing up. I had to roll my window down in order to see in my side mirrors.
Fast forward to installing these led bulbs and now I can see to back up while looking through the tinted windows. The bulbs are a little pricey but so worth it now that I can see!
K
Karisa Hermany (Keeseville, US)
2020-2023 Super Duty Reverse (4257 LumX-FC)
Y
Yosel Malagon (Hialeah, US)
Everything was great.
W
Walter Lemmon (Bel Air, US)
SUPER BRIGHT
Had a little difficulty installing the new LED reverse bulbs, little more pressure to insert bulb into factory socket than expected, but fit and works brighter than expected. No need to mount auxiliary lights to see when backing up.
C
Carl Metcalf (Austin, US)
Don’t fit
Ordered what was recommended and they don’t fit. They will not return my email.
M
Michael Walker (Coventry, US)
Now I can see!
We all know factory incandescent bulbs aren’t the best. I replaced the old incandescent bulbs with these dieselleds and wow what a difference! I can see behind me so much better.
L
Luther Tucker (Elk Park, US)
Love them
Easy installation, fast shipping, and very Bright
J
Jon Cranch (West Henrietta, US)
Super bright reverse lights
These reverse lights were very easy to install and are way brighter than the stock ones!
R
Ronald Pickering (New Haven, US)
20-23 Reverse Lights F350 4257 LumX-FC
Absolutely essential upgrade for a 20-23 Super Duty, now I have no excuse when I hit my trailer backing up at night!
J
John Fredsall (Harwinton, US)
Definitely Bright.
Install was easy and lights are way brighter than stock. My question will be to see how long they last. A little nervous about having fans in the light for life expectancy. We’ll See!
M
Mike Junta (Latham, US)
Best ever
It is literally night and day. Love these things.
W
William Hilton (Dickerson, US)
Great replacement
Works so much better than the old stock bulbs.
J
Jason Crean (Orange, US)
Reverse lights
They’re brighter than I thought they would be. I’d recommend the product
R
Rick Ortiz (Frisco, US)
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.
T
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
J
James Brown (Phenix City, US)
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 .
d
duncan arms
Back up lights
Got the 4257 reverse lights. Work real bright
R
Robert Dee Jr (Galveston, US)
Great Lights
Makes a big difference. Now I can see behind my truck. Highly recommend
L
Lee Billing (Piscataway, US)
too big
They do not fit my truck.
J
John Shea (Auburn, US)
Fantastic Service
Shipped quickly, installed very easy, although they do fit just a bit tighter than the factory bulbs. Bottom line is I am very happy and would highly recommend them
J
James Austin (Baldwinsville, US)
Great product.
T
Tom Skladzien (Wadsworth, US)
Super Duty Reverse
Super impressed on how bright they are compared to stock bulbs. Going to add these to Jeep too.
C
Charlie Blackstock
Reverse LEDs are awesome
They are crazy bright. They are floodlights, not spotlights but are excellent as reverse lights. I will be getting more for my other vehicles. These are on a 2022 F250.
J
Jeffrey Gamazon (Seattle, US)
2020-2021 Super Duty Reverse (4257 LumX-FC)
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Ships same day Order by 2pm Est.
60 Day Returns
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