Lighting is important to any 3D scene, no matter it its a realistic photo or not. Lighting helps convey a mood and time of day, it illuminates the form of objects within a scene. If a scene is lit poorly it will never look convincing, no matter how great the animation, or modeling.
Lights have a few basic properties, it's very important to understand each one independently. These properties are Intensity, Color, Spread, and Direction. You can look at any photo and evaluate the lighting using these properties.
Lights can be set to reflect negative illumination. This is usually available in most 3D Programs, it causes light not to be illuminated onto the scene, but it allows it to be sucked out of the scene. 3D lights can also be set so that they decrease naturally, preventing their illumination from overflowing too far into the scene. This is very useful , it allows you control over the spread of light, helping to distribute only where it's needed.
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