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A factory space of 33 m x 13 m is to be illuminated with an average...

A factory space of 33 m x 13 m is to be illuminated with an average illumination of 72 lux by 200-W lamps. The coefficient of utilization is 0.4 and the depreciation factor is 1.4. Calculate the number of lamps required. The lumen output of a 200-W lamp is 2,730 lm.

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