There has long been a belief among those who have to face lighting problems in a practical way that the mixture of artificial light and daylight is not desirable. One prominent lighting engineer writes that in making a satisfactory installation to be used as a supplement to daylight, invariably more light has to be planned for than is required in an inside room in which artificial light alone is used. In other cases it has been a question of serious debate whether it is not better and perhaps more economical that daylight be excluded entirely in the late hours of the afternoon and artificial light alone be used. In still other cases photometric measurements of mixtures of artificial light and daylight have been discredited as not having their accustomed meaning because of the belief that these mixtures create a visual anomaly. If space would permit, many other
FERREE CE, RAND G. THE PROBLEM OF LATE AFTERNOON LIGHTING. Arch Ophthalmol. 1932;7(4):558–575. doi:10.1001/archopht.1932.00820110072006
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