Just reduce the diameter of Lux's E
Its not the fact that:
thunderlords proc E, auto
Or that you got 100-0 d as a carry from binding
Or that her shield helps self-peel/ignite/death-mark damage
The major issue is E, which is central to her laning phase, and the past E buff was a bit unnecessary, making it too large for any immobile mage to dodge. Like
(kinda)
I used R as Janna after flashing the bind and it just made her do some instant transmission kamehameha, my Vayne barely survived with 20hp.
Also make the ult have a slightly longer cast time that is disruptable.
She has been strong for a long time but more bigger distractions came for the community to QQ about:

- Lux main