Question

A drawing hall 36 m x 20 m is to be illuminated to get an illumination of 20 candles per square metre on a working plane. Assuming space-height ratio as 1.3, mounting height as 3 m, utilization factor as 0.5, depreciation factor as 0.75 and 80 W tube light lamp efficacy as 40 lm/W. calculate the number of lamps, wattage of each lamp and their disposition.

Answer 1

Answer:

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Explanation: