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06/16/00 14:37 FAX 535 7401 ZIXAER51AN SIGN CO lQ 0 <br /> LUMINOUS SIGN REPORT 73 <br /> CALCULATION OF APPROXIMATE BRIGHTNESS <br /> (L) x (UF) x (MF) <br /> B - <br /> A <br /> WHERE: <br /> B = APPROXIMATE AVERAGE MAINTAINED BRIGHTNESS (FL) <br /> L = TOTAL LAMP LUMENS <br /> OF = LIGHT UTILIZATION % FACTOR, <br /> 50% ASSUME FOR SINGLE FACE <br /> 70% ASSUME FOR DOUBLE FACE <br /> MF = MAINTENANCE FACTOR (NORMALLY ABOUT 70%) <br /> A = AREA OF SIGN FACE IN SQUARE FEET <br /> APPROXIMATE RANGE OF ACCEPTABLE SIGN BRIGHTNESS <br /> (AVERAGE, FOOTLAMBERTS) <br /> LOW RANGE = 75 175 <br /> MEDIUM RANGE 150 - 275 <br /> HIGH RANGE = 250 - 350 & ABOVE <br /> SIGN FACE REDUCTION FACTOR & DISTANCE <br /> DISTANCE YELLOW RED BLUE <br /> FROM SIGN LIGHT WHITE FACE FACE FACE <br /> IN FEET SOURCE FACE WHITE WHITE WHITE <br /> COPY COPY COPY <br /> 1 100% 25% 11.25% 3.75% 2.50% <br /> LIGHT INTENSITY OF FACE FACTOR IS DIVIDED BY THE DISTANCE IN FEET FROM SIGN SQUARED <br /> TOTAL UTILIZ. MAINT. FACE AREA OF NO. OF LUMENS <br /> LUMENS FACTOR FACTOR FACTOR SIGN LAMPS IN LAMP <br /> 0 0.50 0.70 0.0000 0.00 0 0 <br /> SIZE OF SIGN IN FEET BRIGHTNESS IN <br /> HEIGHT LENGTH FOOTLAMBERTS <br /> 0 0 #DIV/0! <br /> DESCRIPTION OF SIGN SYSTEM BY DATE <br />