Ambient On, Default On is the normal state of a new blank document in Vectorworks before any lighting options are altered or any light objects added.

Ambient Off, Default On is what happens when you have no light objects, but have manually disabled Ambient lighting in the render style or in Set Lighting Options for the document and is the state that Luis' tip is designed to avoid.

Ambient Off, Default Off is what you get when you add a light object, but turn it off, and also have Ambient lighting disabled in lighting options. This is a "perfect" darkness which if you were inside a room, would be pitch black, and then the Glow textures would be the only light source. If you dont add the light object and turn it off, you get the fake Default lighting which often washes the Glow effect out or alters the intended color.

Will do well as a kbase article, will do!
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