| lightgirl |
2008-08-22 13:58 |
Normalize Z3u6m0!
Normalize the map data to the total emitted flux from all sources. YT)1 _>*\
This option allows you to have the flux and irradiance normalized to the total ka(3ONbG
emitted flux. When this box is checked, TracePro divides the values in the W&I:z-VH
irradiance map and the total flux by the emitted flux. This is especially useful for J5Q.v;
calculating system transmittance for an optical system, or lighting efficiency for a Zk|PQfi+
lighting calculation. Y q|OX<i`K
Example 1: System Transmittance Wi g TNg4
Suppose you need to calculate the system transmittance of an optical system. :zO;E+s
You would probably use the grid raytrace option, and the emitted flux is equal to \]S)PDqR
the sum of the flux in all the emitted rays. When you display an irradiance map, }~0}B[Rf
the system transmittance is equal to the total flux, displayed at the bottom of the N
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irradiance map window, divided by the emitted flux. To get the system >*+n `"6
transmittance, check the Normalize to emitted flux box and press the Apply KxFA@3
button. The map will be redisplayed, and the Normalized Flux value will be equal Ia{t/IX\[
to the system transmittance. NNJQDkO-I
Example 2: Lighting Efficiency q 4Ok$~"I
Suppose you need to calculate the lighting efficiency of a luminaire in illuminating 5;XU6Rz!
a plane. You would probably choose the Surface Source raytrace option, and the c7tO'`q$e
emitted flux is equal to the flux you specified when you defined the sources. When GFnwj<V+{
you display an irradiance map, the total flux incident on the observation plane is 5~#oQ&
displayed at the bottom of the window. The lighting efficiency is equal to the total ~~ p )_
flux divided by the emitted flux. To get the lighting efficiency directly, check the /P/0\3TCi
Normalize to emitted flux box and press the Apply button. The map will be "/taatcH
redisplayed, and the Normalized Flux value will be equal to the lighting efficiency HuN_$aP
of the luminaire.
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