Thanks very much for the help, adacey!

You have been a great help, even if it wasn't the way you intended: I didn't realise they were presets, with content-like icons - guess I wasn't looking in the right place before !

I found the quality presets under DAZ Studio formats>My library>Lights>UberEnvironment. 

I have never used Smart Content either since there is a lot of content that does not appear there, especially the great stuff available here.