5.A small area of 5 metres in diameter is to be illuminated by a lamp at a height of 4.5 m above the centre of the area. A lamp having an efficiency of 24 lumens/watt is fitted with a reflector which directs the light output only over the surface to be illuminated. If the utilization coefficient is 0.65 and illumination 800 lux, determine the wattage of the lamp .
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