A room of 20×15 m is illuminated by 60 W incandescent lamps of lumen output of 1600 lumens. The average illumination required at the workplace is 400 lux. Calculate the number of lamps required to be fitted in the room. Assume utilization and depreciation factors as 0.5 and 1 res pectively.

Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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A room of 20×15 m is illuminated by 60 W
incandescent lamps of lumen output of 1600
lumens. The average illumination required at the
workplace is 400 lux. Calculate the number of
lamps required to be fitted in the room. Assume
utilization and depreciation factors as 0.5 and 1 res
pectively.
Transcribed Image Text:A room of 20×15 m is illuminated by 60 W incandescent lamps of lumen output of 1600 lumens. The average illumination required at the workplace is 400 lux. Calculate the number of lamps required to be fitted in the room. Assume utilization and depreciation factors as 0.5 and 1 res pectively.
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