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It is desired to flood light the front of a building 42
meters wide and 16 meters hig.Projectors of 30 degree beam
spread and 1000 watt lamps giving 20 lumen/watt are
availabl.If the desired level of illumination is 75 lumen/m
and show a suitable scheme.Assume the cofficient of
utilization, deprecitation factor and waste light factor are
0.4, 13 and 1.2 respectively.
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