I said none since it's more like: Loo-see-in
I pronounce it as loo-shun.
I say Loo-shun. The Loose-ee-in pronunciation reminds me unfavourably of Lucifer or something. :/
I prn either spelling as Loo-shun, but I think it probably depends on where you come from. I'm thinking people in the UK and Europe would be more likely to say Loose-ian, and people on this side of the pond would more likely say Loo-shun? I'm sure there are exceptions to each, but that's my guess.
I am English and pronounce it Loose-ee-en whcich is closest to your Loose/Ian so I voted for that.
I live in the States, and say it as loo-shun. To me Lucien is more akin to loo-see-en.