The illumination of a drawing office 30 m x 10 m is to have avalue of 250 lux and is to be provided by a number of 300 W lamps,each lamp having an output of 14 lumens per watt. CU = 0.40, MF =0.90. Determine the number of lamps of required. Show detailedsolution.

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Given As Also Area A E 250 Luminous Thus Efficiency Wattage of each l... View the full answer