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A filament of 200 watts is hung at a height of 5 m above the working...

A filament of 200 watts is hung at a height of 5 m above the working plane and give uniform illumination over an area having a diameter of 4 m. Assuming a reflector efficiency of 60%, determine the illumination on the working plane. Efficiency of the lamp is 0.90 watt per candlepower. Show detailed solution.

Engineering   Electrical-Engineering   
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Answer #1

The illumination on working plane is 133.33 lumens persquare meter.

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