Insert this into every object's finish:

 #if (full_ambient > 0)
  ambient 1 diffuse 0
 #end

And, at the beginning of your scene file:

 #declare full_ambient=0;

When you want to set everything to superbright, set full_ambient to 1.

.....Chambers

PS After thinking a little, instead of setting diffuse to 0, you could put
every light into another conditional and just turn them off (to speed up
rendering).

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