ABSTRACT
Lights are classified according to Color Rendering Index (CRI), which is a measure of the ability of a light source to reproduce the colors of various objects faithfully in comparison with a natural light source. This means that a light with a low CRI will not render colors accurately. Most film lights employ the stepped Fresnel type lens, with a few exceptions that use a simpler plano-convex lens such as a Dedo or an ellipsoidal. A Fresnel lens is a stepped ring design that reduces the thickness of the lens to save on cost and also prevent heat buildup in the center of the glass, which can cause cracking. Big studio softs through a large frame of diffusion is a quick way to create a large soft source in the studio. Often used with the studio soft is the eggcrate, which minimizes side spill and does make the beam a bit more controllable.
