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The room index used to look up a utilisation factor depends on the room's

  • A.surface reflectances alone
  • B.illuminance requirement and the lamp type
  • C.length, width and mounting height above the working plane
  • D.floor area and the number of luminaires only

Answer: C

Correct answer: length, width and mounting height above the working plane

\[ K = \frac{L \times W}{H_m(L+W)}. \] The index expresses how tall and narrow the room is relative to its plan, since a tall narrow room loses more light to the walls before it reaches the working plane. It is used with the surface reflectances to look up the utilisation factor.

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