Daylighting has been gaining popularity since the end of the 20th century. Research conducted in the 1980's and 1990's found that access to daylight increases employee productivity and leads to fewer sick days overall. This research helped push the surge of designs focused on bringing daylight in and reducing dependence on synthetic light sources.
In an effort to replicate the effects of daylight, designers are now able to adjust electric lights to create specific colors and lighting temperatures. These lights are able to mimic natural daylight and work with our circadian cycles, bringing many of the same benefits found with natural lighting sources.
Arup, a firm of designers, planners, engineers, consultants, and technical specialists located in Boston has installed a full circadian-light system that emulates the sun's hues from dawn to dusk. The lighting follows a color temperature curve of 3000K (warm) to 5000K (cool) and back to 3000K over the span of each workday. Arup enjoys the system so much they are in the process of installing similar systems in their Chicago, San Fransisco, and Seattle offices.
Daylighting makes a huge impact on architectural design but it is still seen as a discipline outside the industry.