Cinematography

Key light:

• Most important in lighting setup 
• Highlight form and dimension of the subject
• Omitting key light can result in a silhouette effect
• Key lights may be placed in a scene to illuminate a moving subject at opportune moments

Fill light:

• May be used to reduce contrast of a scene to match dynamic range of recording media
• Using less fill will make shadows seem lighter/darker than normal causing the viewer to react differently by inferring envorinomental and mood clues from the tones of the shadows
• The positioning of the fill affects the overall appearance of the lighting pattern 

Hair light:

• Works especially well in portrait photography 

• Lights up the hair, often angled down 3 feet above the head

• Add interest and texture to an image