Question

A Drawing room with dimension 8x20x30 meter. The required illumination level is 135 (lumen/m2). The working plane is 5 m bellow the lamps. Assume the utilization factor, the maintenance factor are 0.6 and 0.75 respectively. The available incandescent lamps are 300 watt of 13 (lumen/watt) and 500 watt of 15 (lumen/watt). Calculate the power and number of lamps. Draw a schematic diagram for lamps distributions.

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