45 degree Lighting or Rembrandt lighting:

Direct your Main Light toward your subject's face at an angle of approximately 45 degrees. You can use 45 degree light from the broad side, or the short side and to light either a full face or profile portrait. The Main Light should be placed higher than the subject's head and is directed down and at an angle of about 45 degrees. One characteristic of 45 degree lighting is the triangle of light from the Main Light that is on the shadow side of the subject's face. 45 degree lighting is also known as Rembrandt lighting because it is the style of lighting that is seen in many of his paintings.