what nutes and nugs said will be the most cost effective for you, so they set up like this . ' . with the plant in the middle. i would also suggest mixing the sectrtum, for veging i would have the top light 2700k and the two side lights 6500k, then reverse for flowering. this way the plant can maximise its bottom fan leaves too. in any case, that size plant needs more light whatever you decide.
EDIT: also, T5's can range from 28w to 54w, the generic one is usually the 28 which is around 3450 lumens i think.