In the basement, designed to be fully functional, windows provide similar natural illumination.

The second through fourth stories are constructed within a U-shaped light court to allow natural illumination of the interior.

Lighting refers to either artificial light sources such as lamps or to natural illumination.

The broad outside stairs were a continuation of the light well that provided natural illumination for the basement level.

The halls were long and eerie in the scant natural illumination.

The light court provides natural illumination for the interior offices.

An arc of skylights will provide natural illumination to the top gallery, a space 52 feet high, whose interior walls are a continuous curve.

The frontage is punctuated with many windows for the sake of natural illumination.

This would pose a problem if natural illumination were used, as it would be in a field setting or greenhouse.

The image acquisition is therefore independent of the natural illumination and images can be taken at night.