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12 Average intensity 8—25 watt lamps approximately Area Average illumination Averse book shelves candlepower chandeliers with 8—25 Coefficient of utilization entire room ergy floor Number FLOOR Readings foot candles height of 33.5 height of 34 illumination in F.C. illumination in foot Illumination measured improve the illumination increase the wattage inside frosted Installed wattage intensity in foot intensity in P.O. intensity of illumination lamps per table Lumens on plane MAIN FLOOR main reference room maximum to minimum number of lumens Number of readings occupied by book office desk P.O. aisles P.O. tables plane of reference plane parallel PLOOR rated lumen output Rated total lumen Ratio of maximum reading room readings taken readings were taken reference taken reflectors room index shadows six readings stack number Stack rooms surface table height taken at random taken at table taken in aisles total lumen output Total rated lumen total wattage