using tub/shower unit for flowering

anyone know the potential pitfalls or advantages of using my shower/tub unit in a spare bathroom for flowering 2-4 plants? There are no windows in the room, an exhaust fan in the ceiling and an A/C vent blowing over the tub. Im not worried about light getting in as much as the tub area with the curtain closed letting too much light OUT....... If i push things to the back corner of the unit will the 2 side walls and the white shower curtain provide decent light containment and reflectivity? The walls are white porcelain tile.

how many sides are the tile, a friend of mine did 10 ice 2000 in a tub shower 42 x 42 it was fiberglass though prolly a little more reflective than tile non the less the bud turned out great

back side is tile 6" tile, 2 ends are fiberglass, and the shower curtain is bright white plastic