Question

Example 26.15. An illumination on the working plane of 75 lux is
required in a room 72 m x 15 m in size. The lamps are required to be
hung 4 m above the work bench. Assuming a suitable space-height ratio, a Utilization factor of 0.5,a lamp efficiency of 14 lumens per watt and a candle power depreciation of 20%, estimate the number, rating and disposition of lamps.
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Answer 1

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Answer 2

Explanation:

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