"If it can be written, or thought, it can be filmed..." STANLEY KUBRIC
From Encyclopedia PRO
A Backlight is generally mounted behind a subject to light the subject's hair and shoulders without illuminating a subject's front.
Backlighting will cause the edges of his or her hair to glow if he or she has fuzzy hair. This gives an angelic halo type affect around the head. This is often used in order to show that the actor or actress so lit is "good" or "pure". In television this effect is often used in soap operas and has become something of a cliché of the genre.