Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
how this guide will work
Mobafire contains a whole lot of lux guides, so this one won't be tl;dr. In other words, if you have no idea how to play ranged, this won't make you Cpt. Super McAwesomeville.
This is an advanced item build and requires quite a few hours played before it will bear any fruit.
game experience > tl;dr guides
[*] you know when to initiate
[*] you know when to commit
[*] you know when to escape
[*] you know how to evade enemies in team fights (with this build, lux is a leaf)
[*] you have map awareness
[*] you have aim (Lux is pure skillshot, like Ez)
My spell combination
shift E - Q - E (typical harrass)
shift Q - E - (R) - E (only use ult if Q hits)
Additional (depending on what you encounter):
Proof that it works: