I haven't swapped for my tractor yet (I do have a light bar on the front and on the back of my ROPS), but I did go to LEDs for my '97 F350, and the difference is just astounding. When I drive my with's 2018 Toyota Highlander (not fancy lights, but still pretty decent) at night, I'm like "these lights really suck"; I used to get tired driving at night but I don't when I drive the truck because I can see so well. How well? Picks up reflectors easily a mile away. Best yet, despite the truck being on the high end of unlifted trucks (big-ish tires, "offroad" package which I think at the time was basically a factory lift as it's always ridden higher than other similar trucks), I never get flashed by cars coming in the other direction. Driving on the freeway, when I pass anything without LED or HID lights, you can't tell that they have headlights when you get near because the LED light output just paints over their feeble incandescent glow.
My motorcycle got an HID swap years ago to a similar effect (I can ID a lurking cop a mile up the highway, 5kK lights really show off reflectors). I think both the bike and the truck got wider beams, but they both have very sharp cut-offs which helps keep other motorists happy; this probably has more to do with the housing design than anything (bike: stock. truck: new housings that came with LEDs; my old ones were 23 years old and were heavily eroded and leaking).
I've put off getting new bulbs for my 3520 despite one original headlight being dead just because with my light bars I can see plenty well (plus the bucket blocking the lights in many useful positions), but one of these days I'm going to swap something in just because it looks miserable with one eye out.
It seems that light pattern with a tractor almost doesn't matter as long as it's same or more spread; an LED is unlikely to have a tighter beam (because most LED lights have more area that's emitting light than a filament bulb), and a tractor getting more flood is probably pretty useful assuming you're not roading at night in high range with the pedal to the floor.
