Sorry to reply to late to your question. We used one lamp stand for the CHE, but just 2 clip lamps that clipped onto the desk the 20L was sitting. None of the three lamps attached to the 20L.
Lemme see if I can find a picture...
*edit*
And I don't have any pix here at work, on photobucket or in my gallery, so I'll have to find something when I'm at home...