I played Lux support and mid, and honestly I think she's much stronger mid than support. All the CC makes for a decent support, but Lux was made to kill. Her ultimate is the thing that plants her in mid lane. It's made to kill people. The range is perfect for sniping fleeing foes, and doesn't really make sense unless you're using it as a finisher. Where as Morgana's ult is perfect for initiating, and has fairly low kill potential.
tl;dr - lux's ult makes her mid
tl;dr - lux's ult makes her mid
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I am not saying that Lux is in anyways equal to Morgana however if you know how to play either one of them you should have no trouble getting to grips with the other :)
and as I said before some people may actually prefer Lux to Morgana - its a matter of opinion