| lightgirl |
2008-08-22 13:58 |
Normalize Ry@QJn I<
Normalize the map data to the total emitted flux from all sources. TSGJ2u5ie%
This option allows you to have the flux and irradiance normalized to the total |\?mX=a.y
emitted flux. When this box is checked, TracePro divides the values in the cmLGMlF T
irradiance map and the total flux by the emitted flux. This is especially useful for 0]3 ,0s $}
calculating system transmittance for an optical system, or lighting efficiency for a RObo4
lighting calculation. iYqZBLf{S
Example 1: System Transmittance gn2*'_V~ 3
Suppose you need to calculate the system transmittance of an optical system.
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You would probably use the grid raytrace option, and the emitted flux is equal to s$cr|p;7#
the sum of the flux in all the emitted rays. When you display an irradiance map, F;4*,Ap
the system transmittance is equal to the total flux, displayed at the bottom of the NUlp4i~Q
irradiance map window, divided by the emitted flux. To get the system LW={| 3}
transmittance, check the Normalize to emitted flux box and press the Apply ZA u=m
button. The map will be redisplayed, and the Normalized Flux value will be equal i `m&X6)\j
to the system transmittance. !e8OC9 _x
Example 2: Lighting Efficiency S(B$[)(
Suppose you need to calculate the lighting efficiency of a luminaire in illuminating 4pvT?s>68
a plane. You would probably choose the Surface Source raytrace option, and the C 2f=9n/
emitted flux is equal to the flux you specified when you defined the sources. When PQl^j S
you display an irradiance map, the total flux incident on the observation plane is ^#|Sl D]
displayed at the bottom of the window. The lighting efficiency is equal to the total f<1 4-R=
flux divided by the emitted flux. To get the lighting efficiency directly, check the uPVM>xf>w
Normalize to emitted flux box and press the Apply button. The map will be
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redisplayed, and the Normalized Flux value will be equal to the lighting efficiency aG"j9A~ &
of the luminaire.
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