This invention generally relates to automated shade systems that employ one or more algorithms to provide appropriate solar protection from direct solar penetration; reduce 
solar heat gain; reduce radiant surface temperatures; control penetration of the solar 
ray, optimize the interior natural 
daylighting of a structure and optimize the efficiency of interior lighting systems. The invention additionally comprises a motorized 
window covering, radiometers, and a central 
control system that uses algorithms to optimize the interior lighting of a structure. These algorithms include information such as: geodesic coordinates of a building; solar position; 
solar angle solar 
radiation; solar penetration angles; 
solar intensity; the measured brightness and veiling glare across a surface; time, 
solar altitude, solar 
azimuth, detected 
sky conditions, ASHRAE 
sky models, 
sunrise and 
sunset times, surface orientations of windows, incidence angles of the sun striking windows, 
window covering positions, minimum BTU load and 
solar heat gain.