You can choose from several lighting types:

Omni

Shines light in all directions from directly above the image—like a light bulb over a piece of paper.

Directional

Shines light from far away so that the light angle doesn’t change—like the sun.

Spotlight

Casts an elliptical beam of light. The line in the preview window defines the light direction and angle, and the handles define the edges of the ellipse.