Values below the scale are illuminance / 1 lx. This is for (unrealistic) “unit” case that luminaires would have lamps producing 1 klm only, would be point-like and just 1 m over the terrain. A more realistic case would be lamps producing 10 klm each and being 10 m over the terrain: then the illuminances would be just 10× less.
The vertical axis corresponds to the 90-270 azimuth, the horizontal axis to 180-0 one, 0 at the right side. White dots in the plots mark one column height.
