Z
zonal-cavity
inter reflectance method a procedure for calculating
coefficients of utilization, wall exitance coefficients, and ceiling cavity
exitance coefficients, taking into consideration the luminaire intensity
distribution, room size and shape (cavity ratio concepts), and room
reflectances. It is based on flux transfer theory.
zonal
constant a factor by which the mean intensity emitted by a source
of light in a given angular zone is multiplied to obtain the lumens in the
zone. See Chapter 2, Measurement of Light and Other Radiant Energy.
zonal
factor interreflection method a procedure used for calculating
coefficients of utilization, based on integral equations, that takes into
consideration the ultimate disposition of luminous flux from every 10° zone
from luminaires.
zonal
factor method a procedure for predetermining, from typical
luminaire photometric data in discrete angular zones, the proportion of
luminaire output that would be incident initially (without interreflections) on
the workplane, ceiling, walls, and floor of a room.
zonal
multipliers multipliers for the flux in each 10-degree
conical zone from 0° (nadir) to 90° (horizontal) from a luminaire, expressing
the fraction of that zonal flux that is directly incident on the floor of a
room cavity. These multipliers are a function of the room cavity ratio and are
used to determine the direct ratio.
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