what will change if i worked with a 3 dimension hall ? say 30*12*9

3. A hall 30 m long and 12 wide is to be illuminated and illumination required is 50 lux. Calculate the number, the wattage of each unit, the location and the mounting height of the units taking a depreciation factor of 1.3 and utilization coefficient of 0.5 given that the outputs of the different types of lamps are as below: Watts 200 300 500 1000 Lumens 1615 3650 9950 21500 100 4700 3. A hall 30 m long and 12 wide is to be illuminated and illumination required is 50 lux. Calculate the number, the wattage of each unit, the location and the mounting height of the units taking a depreciation factor of 1.3 and utilization coefficient of 0.5 given that the outputs of the different types of lamps are as below: Watts 200 300 500 1000 Lumens 1615 3650 9950 21500 100 4700