Light in school buildings traditionally is from a combination of daylight and electric light to illuminate learning spaces (e.g. classrooms, labs, studios, etc.), hallways, cafeterias, offices and other interior areas. Light fixtures currently in use usually provide students and teachers with satisfactory visual performance, i.e., the ability to read a book, have lunch, or play basketball in a gymnasium. However, classroom lighting may also affect students' circadian systems, which may in turn affect test scores, attendance and behavior.