Lighting your scene can be set using the standard Unreal Lights or the additional Blueprints that were created to emulate some of the unique V-Ray Lights.

V-Ray for Unreal supports some of the standard Unreal lights:

Directional Light – The Directional Light simulates light that is being emitted from a source that is infinitely far away. For more details on its functionality and use, see the Directional Light documentation.

Point Light – A Point Lights emits light in all directions from just a single point in space. For more details on its functionality and use, see the Point Light documentation.

Spot Light – A Spot Light emits light from a single point in a cone shape in a set direction. For more details on its functionality and use, see the Spot Light documentation.

Rect Light – The Rect Light emits light into the scene from a rectangular plane with a defined width and height. For more details on its functionality and use, see the Rectangle Light documentation. 

Sky Light – The Sky light captures the background of your scene and apply it as lighting to your level's meshes. For more details on its functionality and use, see the Sky Light documentation.

For more information on Unreal Lights see the Unreal documentation.

V-Ray for Unreal ships with some Light Blueprints: 

V-Ray Light Dome – A dome light (also considered an area light) creates light within a dome or spherical shape to create a traditional global illumination setup. This Light is frequently used to load HDRI environment images. For more details on its functionality and use see the V-Ray Light Dome Blueprint documentation. 

V-Ray Light Mesh – A Mesh light creates a light source from an object's surface area. For more details on its functionality and use see the V-Ray Light Mesh Blueprint documentation. 

V-Ray Light Rectangle - A V-Ray specific light source object that can be used to create physically accurate area lights of different shapes. For more details on its functionality and use see the V-Ray Light Rectangle Blueprint documentation. 

V-Ray Sun and Sky – A Sun light is a spherical light source placed at a specific location which simulates the sun in the sky. For more details on its functionality and use see the V-Ray Sun and Sky Blueprint documentation.