In lesson work: Lighting workshop- lights

Key Light- This is the main light, the strongest and has the most influence on the look of a scene.

Fill Light- Secondary light and placed on the opposite side of the key. This usually has the scrim on it.

Back Light- Behind the head of the actor in shot.

Using Scrim- When filming a femme fatale scrim is ideal as it softens the shadows and lighting and gives a suave look to them. In the shot below the barn doors have also been partially closed to give a mysterious effect.

Lighting a villain- When lighting a villain you want the shadow to be large and the angle pointing up to make them look bigger such as in the photo below.