Specular
From PyMOLWiki
Overview
This controls whether or not specular reflections are shown unrendered, in the GUI. Turning this off only makes a slight improvement in speed.
Notice in the images above that the setting is controlling the amount of directly reflected light and not the shininess of the reflection.
Syntax
# turn the setting on or off set specular, boolean # turn it off set specular, off # turn it on set specular, on