What Is Short Light?
Short light is type of studio lighting setup, where the face side which is further from the camera gets the main light. see the diagram for details. In this type of lighting setup, the side of the face which is toward the camera gets less light then the side facing away form the camera. The effect you get when using this lighting setup is a thin face, this is why it is good to photograph fat (or chubby) people with a short light setup.

Diagram 1 - Short Light

Let's look at a picture of a friend of mine - Winnie the poo. Looks like Winnie had allot of honey and he is quite chubby. The flash is set up to my right, and Winnie is looking to his left. This make his face look a bit thinner than what they really are. Short light is very useful in portrait photography, as it gives drama to the subject. (Short light setup also stresses skin wrinkles, to create even more drama for older people)

What Is Broad Light?
Broad light is just the opposite of Short light. In the Broad Light setup, THe side that is getting the most light is the side turning towards the camera. This setup is less commonly used for portraits as it tends to make people look chubby. See the diagram for setup.

Diagram 2 - Broad Light

Lets look at Winnie again. This picture was taken at the same focal length (135mm with 1.5 crop factor D70's sensor). This time Winnie looks very chubby. Oh Winnie! what have you been eating? Also note how the picture looks a bit flatter. There are not allot of light and shade plays.

For both types of light you can use a fill light at the opposite side to the main light, or do as I did and use a reflector at 45 deg. (see diagrams).

Conclusion:

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