Not surprisingly, streets lined by skyscrapers not only restrict the light available to people, but they also affect the quality of light. From a stark, cloudy grey, to extreme reflection thrown by vast walls of glass, urbanites largely miss out on natural lighting.
By most accounts, city dwellers spend between 75% and 90% of their lives indoors. And, even though there are walls of windows in many modern buildings, the natural light available to those inside is far from the full spectrum type that aids productivity and healthy sleep cycles. Many people who study light and its effects on humans mostly approach the subject from the money point of view. They try to answer questions like: