Enable – When enabled (the default), the light contributes to the lighting in the level. Disabling it will stop the contribution of the light in the environment.
Is Disc – The VRayLight takes the shape of a planar disc.
Length/ Radius – The length of a Plane light source/radius of the Disc light source, measured in scene units.
Width – The width of the Plane light source, measured in scene units.
Multiplier – Specifies the intensity multiplier in lumens of the rectangle light.
Cast Shadows – When enabled (the default), the light casts shadows. Turn this option off to disable shadow casting for the light.
Color – The color that the light emits.
NEW - Directional – The light from the Plane or Disc light is spread out equally in all directions on the side in which the light points. As this parameter is increased toward a value of 1.0, the spread narrows, making the light more directional. A value of 0 the light shines in all directions around the light source. A value of 0.5 pushes the light cone to a 45-degree angle, and a value of 1.0 makes a 90-degree light cone (No effect in viewport).