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A few weeks ago I was playing as Lux and went several games in a row without dying, so I decided to try getting Mejai's as soon as possible. Obviously, going the whole game without dying, I never lost my stacks and this cheap item added 160 AP to my stats. Warding the river kept me alive and I was able to buy Boots of Lucidity and Catalyst the Protector at the same time early on. From there, just fill a support role; shield your teammates when they're entering a fight and stay just barely outside Binding range of heavy melee champs so you can use it when someone advances.
These summoner spells are great. Ghost gives you a greater chance of escaping ganks or catching up to and stunning retreating opponents. Clarity allows you to maintain a relatively steady stream of spells, esp with low cooldown, and with the Clarity mastery you can keep your stronger teammates in the fight for longer, adding more than half max mana to most champs.
Good map awareness is key with support Lux as you can easily cover the entire map, stunning and slowing any lone enemies you encounter in the jungle. One of my favorite moves while heading towards a teamfight is to right-click near the fight, then hit R and keep my screen focused on the fight. When the tip of the arrow from Finales shows up I blast whoever's in range. It's cooldown will be around 30 seconds mid-game so if I play the fight properly it's back up by the time more enemies show up.
Rabadon's adds power mid game and with short cooldowns I never really wasted space with Magic Penetration items. Frequent golem buffs and checking common bushes with E are also important. Another thing is when evading a gank be sure to lead them with Singularity, triggering it just as they leave it's range. Then stun and keep running if they have a lot of health. The only thing that changes if I'm rescuing a teammates is to shield first, then E, then Q (enemies are easier to hit with Binding if they're slowed). If my teammate is smart he can usually do some damage while they're stunned and I might be able finished them off with Finales.
One last thing I've noticed... although Lux's shield isn't the strongest, it really adds a key element to a team fight. When we're all standing there trying to push mid and suddenly our entire team (if I'm accurate) has shields, it seems to add confidence and the team works better together in those few seconds, focusing squishies and CCing better. And remember, it shields again on the way back to Lux, so you can boomerang it to hit more friendlies.
Well that's about it. Good luck and have fun!