OK this is an interesting guide.

You are getting AP which can help with your harass and helps buff your Prismatic Barrier albeit by small amounts because of the ratio.

One thing I have found out reading guides about her you want max cooldown reduction. One good suggestion is Morello's Evil Tome it also gives some AP and mana regen as well. I would recommend replacing Zhonya's Hourglass for it, you get enough survivability from the Guardian Angel.

I would also say that the Doran's Ring be sold so you only have 5 items so you have room for wards seeing as you are making a support build.

Specolar

I think this is a good start, I hope you plan to work on it more :)

I wonder if you're going as a support, if you plan to be sharing the farm or babysitting? As I generally play Lux as an AP carry and leave support for other champs, I would say that racking up that gold for the first Archangel is going to be quite difficult.. I would suggest a gold stacking item such as Kage's Lucky Pick or a Philosopher's stone for the health/mana regen.. And although you play her as a support i would think that Lux's E should be maxed earlier than her Q, for the more AOE damage you do the easier it is for your teammates to pick off the enemies. Q should be used mostly for the bind. :)

But I agree that Lux is a great support with her annoying CCs. Keep it up :)

Thanks for your advice. Ill try your tips and see how it pans out.

and i build tear of goddess, and stack that mana. i dont rush for archangel. i ruch rabadon and after rabadon i go for archangel. my items are:

CDR boots, shurelya, tear of goddess, rabadon, and now i build archangel. By now the game should be over, if not go for zhonya.

AND REMEBER U ARE A SUPPORT NOT AP CARRY, ALAWAY BUY WARDS AND U SHOULD HAVE ORACLE

hi..
i play lux as support to. and i think my lux is better :)
the diference between u and me is:
i have gold per 10 runes (u are a support, no farm = no gold, this runes are the best for support)
i start with: Regrowth Pendant, ward, and health potion. I know what E does, but ward is a ward. dragon control etc
and my ability sequense is different. i start with q and max it last. i max E tp harras and W to shield and protect my carry.
i go for E insted of Q couse if the oponent player plays safe and stays behind u cant rich him with Q (and that bonus dmg u have on Q is usless in that case), but with E u can. I am lvl 30 summoner, and people know what lux can do. and i rly think that u should max Q at last. Take one only for cc. If u have any questions about my gameplay, PM me.
GL

Reserved for updates :)