Two issues with Lux skins as a non lux player
As a non lux player I've not brought this up in the past because it was only one way, now it's two ways so I hope Lux players will agree.
Steel Legion skin- Her ultimate is too thin on initial casting (before it goes nuclear) this has long been a popular skin because it gives an actual in game advantage, it's harder to dodge as it takes a second before you realize what's happening. Widen the initial beam on this skin to balance it more on par with her original skin.
Star Guardian lux- Her ultimate starts out too wide due to how bright it is, this makes it exceptionally easy to dodge on the outset of casting, narrow the initial casting beam a bit.
cares not for width....wait.
an assassin, I'll give you that.
and listen for audio cues so you can deal with Steel Legion and Star Guardian's Q/E/R. I mostly use Sorceress and Spell Thief even though I have all of her skins except Commando and Imperial.