8. It is required to produce an illumination of 100 lux in afactory hall 30 m by 15 m. Assume that the maintenance factor is0.8, coefficient of utilization is 0.4 and efficiency of lamp is 14lm/W. Suggest the suitable rating, the number of lamps and theirpossible arrangement. The sizes of the lamps available are 100,250, 400 and 500 W.
ANS [40 lamps of 250 W in 5 rows]
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