Roger:
With all due respect to you, and all the other members, please hear me out....
210.70 et al.
What I'm trying to convey is that there must be a provision for illumination within the areas as defined in 210.70. You can call it a 'lighting location', a 'lighting outlet', a 'switched recept' or whatever that particular person wants to refer to the "LIGHT" as. A "blank cover" (inviso-plate) on a location that is the ONLY means of illumination in an area "FAILS".
Further......a "room" that has four (4) wall sconce locations on a SP sw.; a "ceiling" location on a SP sw, and a 1/2 switch controlled receptacle need NOT have all the "fixtures" installed, as long as there is ONE functioning switch controlled means to provide illumination.
John