Three point lighting: back light
In this series Ian Hider, BBC Academy trainer, covers the basics of three point lighting.
In a traditional interview setup the back light illuminates your interviewee from behind, separating them from the background and giving your picture a more three dimensional look. It is usually placed behind the subject or diagonally opposite the key light.
"The back light makes the picture look more three dimensional." – Ian Hider
The strength of the light you need will depend on the subject: dark-haired interviewees need brighter back lights than people with light hair.