Here is your room again Alex. The mainproblem with the scene was that no walls had any thickness at all.Every photon/lightmap renderer needs this thickness otherwise it goes crazy and dont know where the photons goes.
try the scene and keep on experimenting from this basics. If you want a backdrop/image to cast photons, add an image to a plane and put the plane outside the window and turn up luminosity until it looks ok.
/Silver
			
							Alex testroom
Alex testroom
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