Correct option is A∙ Maintenance Factor (MF) is defined as:MF=Illumination under actual conditionsIllumination under ideal (clean) conditions∙ It accounts for factors such as:∙ Dust accumulation∙ Lamp depreciation∙ Deterioration of fittings\bullet\ \textbf{Maintenance Factor (MF)} \text{ is defined as:} \\[0.5em]\text{MF} = \frac{\text{Illumination under actual conditions}}{\text{Illumination under ideal (clean) conditions}} \\[1em]\bullet\ \text{It accounts for factors such as:} \\\quad \bullet\ \text{Dust accumulation} \\\quad \bullet\ \text{Lamp depreciation} \\\quad \bullet\ \text{Deterioration of fittings}∙ Maintenance Factor (MF) is defined as:MF=Illumination under ideal (clean) conditionsIllumination under actual conditions∙ It accounts for factors such as:∙ Dust accumulation∙ Lamp depreciation∙ Deterioration of fittings
