Agreed wholeheartedly with what
@Rockbox says above - I swapped my original bulbs for Philips X-treme Vision Pro150, and the difference over the factory bulbs is massive. And way, way better than the LED of my previous car.
The X-treme Vision Pro150 bulbs are a straight swap with the original bulbs, and a totally safe upgrade with the bulbs staying at the same 55W, so no coding required, and since putting these in, I haven't had one single objection from another road used with regards dazzle (which I did constantly with the LEDs of the previous car). Having had both setups, if I was to change the Leon again, I would certainly go for another with halogens over the LED.
These bulbs aren't cheap, but are worth every penny - I've got them in both dipped and main beam (H7 bulbs for both). They are noticably whiter than standard bulbs as well.
Here's the link to the seller I got mine from.