@Meddler/Balance Team: Please don't touch Lux until after the immobile mage update
Who knows? One of the immobile mages might outpower her after the update. And honestly, Lux isn't OP; she's just safe, and the meta encourages safety because of nasty death timers.
But if you MUST nerf her due to all the Lux haters, the only thing I'd recommend is looking at her Q and R's hitboxes, which sometimes don't match the visuals. Smaller hitboxes have always been a good way to separate the great skillshot players from... well, I'm not going to say "good skillshot players" because they're actually bad.
EDIT: Downvoted before the topic even finished posting. WOW.