3 Point Lighting Research

Fill light - This is the secondary light that is place next to the key light. It's mainly used to get rid of the shadow that the key light makes and to do this it is normally dimmer than the key light.

High key light - This it he main light that tries to be free from dark shadows giving it a more realistic effect.

Low key light - Low-key lighting often uses only one key light, optionally controlled with a fill light or a simple reflector. It gives it a more natural lighting look rather than artificial.