This is the fraction of lamp lumens emitted by a fixture that ultimately reaches a task surface located within a room of specific proportions and surface reflectances.

(1983). CU - Coefficient of Utilization Tables. A portion of the datasheet for the fixture described by the 483T8_S.ies Photometric Web File is shown here.

the coefficient of utilization, it may be unwise to use the latter value as an index of coronary flow.

This table of contents is updated regularly to reflect the addition of newly published documents. Halo H7-304 Black Trim • Recessed R30 FL. Author: Ward Harrison.

Lithonia LB240A • Ceiling Mounted Fluorescent. That is how it automatically calculates it-but you cannot use the default light sources.

Coefficients of Utilization for Illuminance and Exitance in Long, Narrow Spaces. It is derived from the candela chart using a flux transfer calculation method.

Published & professionally reviewed by: Illuminating Engineering Society (IES) File: Download. I'm not sure how to read the coefficient of utilization table. How is the Coefficient of Utilization table created from the candela information in the IES standard illuminance files?

The IES Lighting Library is the comprehensive collection of current IES and ANSI/IES Standards. 13, 1983 IES Annual Conference papers, pp. Coefficients of Utilization. Illustrating the application of the data presented, typical Coefficient of Utilization Tables, as determined for a number of reflector types in common use, are included. Halo H7-426 Alzak • Recessed PAR 30 FL. 15 Point-by-Point Foot-candle = Candle Power Distance 2 FC = 2651candelas / 9ft2 FC = 2651 / 81 FC = 32.7 foot-candles Point-by-Point Foot-candle = Candle Power Distance 2 FC = 2651candelas / 9ft2 FC = 2651 / 81 FC = 32.7 foot-candles. A portion of the datasheet for the fixture described by the 483T8_S.ies Photometric Web File is shown here.

4-13. A coefficient of utilization (CU) is an extremely useful piece of information. Coefficient of Utilization (CU) Factors influencing coefficient of utilization: The efficiency of the luminaire The luminaire distribution The geometry of the space The reflectance's of the room surface Each luminaire has its own CU table specific to that luminaire’s light distribution and efficiency. E = the illuminance level is chosen after consideration of the IES code, the area is the working area to be illuminated, the lumen output of each luminaire is that given in the manufacturer’s specification and may be found by reference tables. MF is maintenance or (the light loss LLF) factor. It may be defined as “the ratio of total lumens received on the working plane to the total lumens emitted by the light source”.i.e. Halo H7-426 Alzak • Recessed R 30 FL.