Shadows – When enabled (default), the light casts shadows. When disabled, the light does not cast shadows.
Affect Diffuse – When enabled, the light affects the diffuse properties of the materials.
Affect Specular – When enabled, the light affects the specular of the materials.
Affect Atmospherics – Specifies whether the light influences the atmospheric effects in the scene. The value determines the amount of involvement.
Caustic Subdivs – Used by V-Ray when calculating Caustics. Lower values produce noisy results but render faster. Higher values produce smoother results but take more time.
