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A room 40 m x 15 m is to be illuminated by 1.5 m 80-W fluorescent...

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Electrical Engineering

A room 40 m x 15 m is to be illuminated by 1.5 m 80-Wfluorescent tubes mounted 3.5 m above the working plane on which anaverage illumination of 180 lux is required. Using maintenancefactor of 0.8 and the utilization factor of 0.5, (a) calculate thenumber of tubes required, (b) sketch a suitable layout. The 80-Wfluorescent tube has an output of 4,500 lm.

ANS FOR A: 60 TUBES please show complete solution.

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