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Solaris does not have a texture manager.  To use a texture on a light source, you must first use txmake to convert the files to .tex

Known Limitations 

A number of lighting features aren't supported yet within Solaris:

• RenderMan doesn't have a point light type, so the point light type on the node is translated as a sphere light.
• Light plugins that aren't part of the USDLuxLight schema - PxrEnvDayLight, PxrAovLight, custom light plugins 
• PxrMeshLight
• PxrPortalLight
• Light Filters