One of the best things you can do with light in SH3D is using LARGE light sources. Try a light bulb of 100x100x100 cms (40x40x40 inches) placed in the middle (vertically and horizontally) of the room at a rather low setting (15-30%). This will give light but hardly any shadow.

All the other lights can then be used to accentuate your light fixtures, instead of illuminating the room.

H