Rembrandt lighting is a lighting technique that is used in studio portrait photography. It can be achieved using one light and a reflector, or two lights, and is popular because it is capable of producing images which appear both natural and compelling with a minimum of equipment.
Normally, the key light is placed high and to one side at the front, and the fill light or a reflector is placed half-height and on the other side at the front, set to about half the power of the key light, with the subject, if facing at an angle to the camera, with the key light illuminating the far side of the face.
The key in Rembrandt lighting is creating the triangle or diamond shape of light underneath the eye. One side of the face is lit well from the main light source while the other side of the face uses the interaction of shadows and light, also known as chiaroscuro, to create this geometric form on the face.
The triangle should be no longer than the nose and no wider than the eye. This technique may be achieved subtly or very dramatically by altering the distance between subject and lights and relative strengths of main and fill lights.
My Response to Rambrant Lighting:
In the images you can clearly see a triangle of light on the left side of the face. To create the Rambrant lighting effect i used one key light source and that was a soft box at a 45 degrees angle so that most of the light was just on the right apart from the small triangle on the right.