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The UF is used in average lumen calculations to calculate the average illumination level for an area with a specific luminaire. Illuminance Cone Diagrams. Electrical Installation Lecture No.11 Dr.Mohammed Tawfeeq Alzuhairi Lighting design and calculations THE LUMEN METHOD This method is also called: Basic lighting calculations that are required to carry out a lighting design. • Luminous flux, luminous intensity, illuminance,. …we can solve this for either the number of fixtures (black) …or the amount of illumination on the work plane in FC (green)… # fixtures for a new design. FC forThis means the light reflected from ceilings, walls and floors which and depends on the colours, type of floor and ceilings. Table -1 gives the reflection The simple and basic approach for calculating the lighting requirement is to divide the total light requirement of the room by light output (lumen) provided by