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Calculate room index. 4. Evaluate utilisation factor from manufacturer's data. (Table B). Table A Typical Reflectance Factors. Page The method of calculating the utilization factor (UF) is detailed in lighting design books, although lighting manufacturers' catalogues. Utilisation factor table. Reflectances (%) for ceiling, walls and working plane (CIE) Room 0.80 0.80 0.70 0.70 0.70 0.70 0.50 0.50 0.30 0.30 0.00 Manual, data sheets/tables, graphical, spreadsheet, computer software Example of luminaire photometric data and utilisation factor Design.pdf.aspx6 The coefficient of utilization values for component curves, Table 5, are based on tests in rooms with 14 per cent. floor reflection factor. Page 13 Utilisation Factor Table Luminaire Lamp Lampflux Measurement code Measurement date Measurement status: TBS160 4x18W M1