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transform - Similarly to the direct light plugin, the position doesn't matter as the light comes from infinity. The rotation matrix has to be set correctly, even though in theory the Sun is omnidirectional. The identity matrix results in light directed along the -Z axis, thus a noon Sun.
target_transform - Currently doesn't make a difference. Don't leave uninitialized - set an identity transform.
turbidity - See VRaySun
ozone - See VRaySun
water_vapour - See VRaySun
size_multiplier - See VRaySun
color_mode - See VRaySun. Values are 0, 1, 2 respectively for Filter, Direct, Override mode.
intensity_multiplier - Relative intensity of the Sun (default 1.0). Try setting correct scales in SettingsUnitsInfo first.
filter_color - Force a color tint. It's probably better to leave this white. See also the color_mode parameter.
ground_albedo - Sky parameter, unused if there is no sky attached. Account for light reflected off an imaginary ground and scattered back in the sky. Default is (0.2, 0.2, 0.2).
horiz_illum - Sky parameter, unused if there is no sky attached. Specifies the intensity (in lx) of the illumination on horizontal surfaces coming from the sky if sky_model is 1 or 2.
sky_model - Sky parameter, unused if there is no sky attached. Selects the mathematical model approximating sky illumination. Values: 0=Preetham et al; 1=CIE Clear; 2=CIE Overcast; 3=Hosek et al.
up_vector - Set to (0.0, 1.0, 0.0) if your scene up-axis is +Y to have correct lighting.

Node

transform - World transformation applied to the geometry vertices which are defined in object space.
geometry - Reference to a geometry source plugin, such as GeomStaticMesh for example.
material - Reference to a material plugin. This should almost always be a MtlSingleBRDF.
visible - Set to false to disable the object. It will not be included in the raytracing intersection tree.

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mesh - A mesh plugin to use for some types of instances, depending on render_type.
render_type - 3=multipoints; 4=multistreak; 6=points; 7=spheres; 8=sprites; 9=streak. The default is 7.
colors - ColorList with a color for each particle.
positions - VectorList with the particle positions.
velocities - VectorList with velocities for motion blur. The values are in world units per frame.
For the rest of the parameters for particular particle types, check the parameter list as described in Debugging and help.