Traditionally, lighting designers have concentrated on creating lighting conditions that are suitable for the visual tasks performed in a room and simultaneously meet individual needs. Following the discovery of light sensitive photocells in our eyes in 2001, considerable attention has focused on the possibility of using daylight to achieve a healthy lit environment. Daylight is rich in the part of the spectrum that seem most important to these light sensitive processes. The science moved rapidly in the following ten to fifteen years.
In 2011 it was again time for a review of the state of the art on the health and well-being effects of daylight and windows.
The VELUX Group commissioned NRC Construction to review the literature, focusing on the effects of daylight in residences. The conclusions may be broadly summarized as: