TheVRayAmbientLightis a V-Ray specific light source plugin that can be used to create light that doesn't come from a specific direction. It can be used to simulate GI, ambient occlusion etc.
Enabled - turns the VRayAmbientLight on and off.
mode - specifies which rays are affected by the VRayAmbientLight.
Direct + GI - affects both direct and GI rays
Direct Light - affects only the direct rays
GI - affects only the GI rays
gi min distance - specifies a distance from objects within which the GI rays will not be affected by the VRayAmbientLight
color - the color of the VRayAmbientLight
intensity - an intensity multiplier for the VRayAmbientLight
light map - specify a texture for the VRayAmbientLight.
compensate exposure - this option has effect when the VRayAmbientLight is used along with the VRayPhysicalCamera. When checked this option ensures that the color of the ambient light is not affected by the exposure settings in the physical camera.