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The V-Ray Rectangle Light or an "area light" is a planar light source. The light's shape can be set as a rectangle or a circular disc.

UI Path: ||V-Ray|| > V-Ray Lights > Rectangle Light

Shadows – When enabled (the default), the light casts shadows. Disable this option to turn off shadows for the light.

Shadow Bias – Moves the shadow toward or away from the shadow-casting object (or objects). Higher values move the shadow toward the object(s), while lower values move it away. If this value is too extreme, shadows can "leak" through places they shouldn't or "detach" from an object. Other effects from extreme values include Moire patterns, out-of-place dark areas on surfaces, and shadows not appearing at all in the rendering.

Shadow Color – Controls the color of shadows for this light. Note that anything different from black is not physically correct. 

Image RemovedImage Added

Project is used to create a list of objects that can be excluded (or included) from the light's effects, such as illumination or shadow casting.

Mode – Specifies whether the objects in the list are considered Included or Excluded from the light's effects.

Objects – Creates a list of objects to be excluded or included. When an object is added to the list, the Image Added icons appear, which determine how the light affects the object. The Image Added icon controls whether the emitted light affects the object. The Image Added icon controls whether the shadows caused by the light affect the object. The Image Added determines whether the object's children are affected.