I have the 2.0 Tucson, 2021. Based on the manual, the bulb is H7. I did the LED conversion on my Veloster that has the H11B, it was more involved, the H7 might be easier.
On the Veloster, I have a projector style housing. I have not changed anything on the car, so if there were to be a warranty issue (warranty is over now), I will just swap the bulbs back in. Prior to the conversion, I tried super bright regular bulbs, but it got burnt in 6 months and that didn’t even include a lot of night driving. The LED is brighter with a little bit better visibility. Not very dramatic but I can get all the help I can.
The 2021 Tucson to me is just fine right now. I think it might be the higher sitting position compared to the Veloster that helps.
I checked and I am not glaring anyone.