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Secondary Specular Gain
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This is the cross-section aspect ratio of the hair and is usually between 0.85 and 1.0 for realistic hair. This is most often used when rendering curly hair. (Note this depends on the hair normals, you should supply user normals through a PrimVar other than specifying N.)
Glow
Glow can be used to create hair fibers that appear to emit light or "glow" in the scene.
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Specify shadow color. This parameter is useful for faking a shadow color for art direction purposes. Note that this creates "transparent shadows" and will increase render time as more rays are traced between hairs. It may also influence global illumination between the objects.
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Below are the named and user lobes from PxrMarschnerHair. Named Diffuse Lobe
Named Specular Lobes
User Lobes
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