Redshift ligth types. Physical light and IES. Volume light in Redshift.

In this tutoriak I'm talking about the types of the light sources in Redshift. I show Redshift Physical Light and IES. I'm talking about volumetric lighting and sampling for him. I show the Gobo effect and the projection of caustics and shadows from the image. I conduct a test render with a Volume Light from IES on the GeForce GT 1030, and on the our farm Forrender.com - on 1 * GTX 980Ti and 4 * GTX 1080Ti