This .NET class wraps the AcGiDistantLightTraits ObjectARX class. 

DistantLightTraits represents a distant light source, whose light is emitted in parallel rays, with an infinite distance between the light source and the model. 

A light passing its properties to this class should not rely on any default values.

Autodesk.AutoCAD.GraphicsInterface.SubEntityTraits
    Autodesk.AutoCAD.GraphicsInterface.DrawableTraits
        Autodesk.AutoCAD.GraphicsInterface.NonEntityTraits
            Autodesk.AutoCAD.GraphicsInterface.LightTraits
                Autodesk.AutoCAD.GraphicsInterface.StandardLightTraits
                    Autodesk.AutoCAD.GraphicsInterface.DistantLightTraits

Public abstract Class DistantLightTraits
Inherits StandardLightTraits

public abstract class DistantLightTraits : StandardLightTraits;