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.
Info: Lux is a good support/carry character with a low cool down ult and a scouting spell
Masteries: I go with a standard 9-0-21 build, using the flash and clarity masteries.
Summoner spells: I noticed early game Lux tend to run out of mana really quickly so I use clarity to cast more spells for the early feed. Flash is an essential for Lux due to the lack of escape moves she has.
Runes: For reds i use magic penetration runes, yellows for Mana regen, blues for Cooldown Reduction, and More Magic penetration for Quints.
Skill Sequence: I like to get light binding first then max out lucent singularity then get my ult when ever available, then max out prismatic barrier last
Skill Combo: At lvl 1 use Q then go for the illumination bonus damage. When you get your E the combo goes Q>E then basic. At lvl 6 I use light binding then throw down lucent singularity then finales funkeln while they're still snared then explode lucent singularity if they haven't already died. So it's somting like this Q>E>R>E
I hoped you liked my build guide remember to comment and like :)