The technique of rembrandt lighting employs a key light that is positioned to cast a shadow on the face of the subject. secondary lights may be used for fill effects but there should be one main light source in order to create the shadow. Rembrandt lighting may be identified with a triangular shadow on the face of the subject.
Diffuse Lighting:
Diffused light is soft and shadowless. Diffuse light will allow the camera to capture good detail throughout the subject. diffuse lighting generally creates flattering images. In order to create diffuse light light can be reflected off of a surface or filtered through a fabric. Proper diffuse lighting creates an environment in which there is little or no shadow cast.
wikipedia - diffuse reflection:
Diffuse reflection is the reflection of light from a surface such that an incident ray is reflected at many angles rather than at just one angle as in the case of specular reflection. An illuminated ideal diffuse reflecting surface will have equal luminance from all directions in the hemisphere surrounding the surface (Lambertian reflectance).
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