The light is over on the extreme right of the photo. So the upper part of the body of the model is shielding the mid area of the subject. You can see that the shadow of her breast on on the leg for example. Basically for these kinds of shots, place the model and then move the light until you get the shadows you want.
The light is one of those quartz halogen work lights as you can see in the photo. It has two heads. You can't see the head that's on because its behind the flag that protects the photographer's lens from the light. Keep in mind that the just by how you pose the model and/or props, you'll have whatever you want in shadow. By the way, I put the black reflector there on the left to cover the white wall that was there to keep in from reflecting light back into the scene.
The other thing of interest in this lighting photo is that it is an example of a dual processed RAW image. Since the contrast range was so great in the area, I developed the RAW image once with good exposure of the model and once for good exposure of the lights. I then merged the two images, and used a quick mask to blend in the lighting exposure to the model exposure. I then used history brush and Gaussian blur to blur out the area below the lights to obscure the person setting there.