The following standards are advisory, rather than mandatory:

(1) Sources of illumination, both natural and artificial, should be provided with light diffusion means, or should be of a type and design which limits excessive glare.

(2) The following minimum lighting, measured in foot-candles, should be maintained during all periods of use:

(a) hallways, corridors, storerooms, locker rooms, shower rooms, auditoriums (not for study) -- 10;

(b) cafeterias, reception rooms, swimming rooms, gymnasiums, toilet rooms, laundry rooms -- 20;

(c) classrooms, study halls, lecture rooms, art rooms, libraries -- 50;

(3) In shops, laboratories, drafting rooms, typing rooms, home economics rooms, or other areas where pupils use specific machines or equipment, a minimum of 100 footcandles should be maintained on such machinery or equipment while in use.