Well, first and foremost, I don't know how big this 'closet' is but that sounds like a lot of wattage for that small of a space. But if it is a pretty big closet, that should work. Sensi Star is a great strain. There's no real need to keep a mother plant alive if he's only allowing you to have three plants in there. You might as well just take two clones from the clone you bought, root them for a couple weeks, then throw them into flowering with the original clone you bought. And both soils would work wonders. Mix in some perlite with them, though. 60% Soil and 40% perlite is my ratio.