You wanna shoot this without a studio? Here's my suggestion. Tack up some black background material. Have the person stand a little bit left of center from the opening of a doorway, nose pointing toward the open doorway. Boom. There's your light source.
Closer to the open doorway, and the light will have very rapid fall-off. Seven to eight feel into the center of the room, the light will be lower, yet much,much more gradual in its fall-off.