Windows and Skylights Windows and skylights are the major sources of natural daylight. Some educators promote windowless classrooms to keep students from being distracted or to prevent vandalism. Psychologists and physicians, however, have conducted studies that show a biological need for windows. If violence is a problem for the school, windows can overlook an interior courtyard protected from street access. If security is a concern and building design excludes the courtyard, skylights are another excellent option.
Skylights produce outstanding color rendering along with high levels of illumination.
Skylights can provide illumination levels of 100 to 200 fc on a sunny day, which have been found to reverse these negative effects. The cost of 150 to 200 fc of illumination through electric lighting would be prohibitive. Students can be exposed to these levels between classes when skylights are used in common areas or if regular outdoor activities are incorporated into their daily routine. Placement of Light Fixtures Thoughtful placement of light fixtures can actually reduce the number needed in the classroom while still obtaining the necessary illumination levels. This in turn yields long-term energy cost savings.