Hi this is my guide for Lux I think she has amazing damage becasue of her range, zone control and her passive combined with Lich bane she can kill anyone when played right!

NOTE : THIS GUIDE IS QUICK AND NOT REALLY IN-DEPTH BECAUSE THIS IS MY FIRST GUIDE

Pro's:
Heavy Damage early and late game
Great passive and Ligh Bane link
Great Zone control
Great CC

Con's:
Squishy
Needs skill to max her damage potential
Drinks mana fast eaarly game

I used the Mana Runes to aid her early game - she needs them

The Magic Pen to max her damgage in the game

The Ability Power just for that extra bite early game so she can get fed and be powerful

The masteries I chose really help Lux the mana regen and the extra ability power really help her early game allowing her to dominate her middle lane.

Max The E first and choose it first early game for the great range and the slow- this help escapes ganks it acts as a small mini ward allowing her to see into bushes and zone out the apposing champion.

Next choose the Q to use at level 2 for the stun allowing you to lock them down and use your passive as well as throwing your W on them and then your passive again. Max the W second.

For your 3rd skill your shield this is quite useful to shield yourself when ganked it can also protect against ignites.

Finally your ultimate this is an amazing high damage long range skill you should max this whenever possible. (Use this as a finishing blow or to aid your team mates from the middle or the tri bushes to finish people off.

First use your Q to lock them down, then auto attack fro your passive, then your W and again auto attack for the passive, then if they are not dead your ultimate to do the final crushing blow, the cooldown is so quick it will be ready in a short amount of time!

Doran's Ring - For the health, mana regen and the ability power it is prefect for her
Boots of Speed - For the speed boost
Sheen - Helps with her passive and gives you ability power and mana
Scorer's Shoes - for the magic penetration and enhanced movement speed
Lich Bane - Magic resist, ability power, mana and the passive combination
Rabadons Deathcap - For the ability power
Rylai's Crystal Scepter - For the ability power and increased health
Morellos Evil Tome - For the mana regen, ability power and cooldown reduction
Void Staff - For the ability power and magic penetration (really helps taking down the tanks)

Lux is a powerful champion who can realy take down single targets well or contribute in teams fihgts due to her double stun on her Q, her slow on her W and her shield that can be thrown at all allied champions also her ultimate can go long range and take down whole teams on low health!!