"But lux we need a sightstone for wards"
"I AM...THE WARD"
She does light up the map
I thought that was 
: 
and your first back is a mejais, that's the only legit way to play lux, be it mid or support!
ikr, so easy to tell that the OP doesn't play enough
.
Hard Decisions? What hard decisions? You won't see a Lux main mopping her brow over this one.
How is that a decision? Doran's Ring for mid Lux, Spellthief's for support Lux. Easy.
But support lux wants that extra power from the ring, and she makes up the gold in kills. Or does she?
not if shes on my team.. the one on my team casts her ult backwards and says im bad for "not setting her up" for whatever she was planning
She forgot that the old R-flash trick was patched...
Sigh ... I loved that trick.
well i learned today that lux's ult doesn't get cancelled by nami bubbles... that support lux defiantly had her way with me
But the passive is completely wasted unless you're planing on taking your ADC's farm.
I'm just harassing with E.
I don't know, if I find myself playing Lux middle again for some reason, I might be tempted to go Spellthief's Edge. The vision and pick potential from Frost Queen's Claim could turn a potential ambush the other way, and the new speed enhancement could make it safer to proc passives.
+ 
no reason to start doran's ring
starter items are lame. real skill comes with dodging your opponent's shots without any items and still claiming first blood. which is why i hate tracking rounds.
though i always take duo lane income items. whether im support or the primary laner if im in a duo lane i take an income item.