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To create a Directional Light, use the button in the V-Ray Lights tab. Select a point position in the viewport. If a list of input positions is connected, multiple lights are generated. The number of input positions determines the lights count.

The point position and target point combined determine the light orientation vector.

Shadows – When enabled (the 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.