| lightgirl |
2008-08-22 13:58 |
Normalize ganXO5T$
Normalize the map data to the total emitted flux from all sources. ~ s# !\Ye
This option allows you to have the flux and irradiance normalized to the total ^_o9%)RL(
emitted flux. When this box is checked, TracePro divides the values in the yMCd5%=M\
irradiance map and the total flux by the emitted flux. This is especially useful for RQt\_x 7P
calculating system transmittance for an optical system, or lighting efficiency for a
avwhGys#
lighting calculation. r5(-c]E7
Example 1: System Transmittance (14J~MDB
Suppose you need to calculate the system transmittance of an optical system. N %" /mcO
You would probably use the grid raytrace option, and the emitted flux is equal to ZW>?y$C+
the sum of the flux in all the emitted rays. When you display an irradiance map, v.pj
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the system transmittance is equal to the total flux, displayed at the bottom of the "F8A: tR
irradiance map window, divided by the emitted flux. To get the system &9,<_1~
transmittance, check the Normalize to emitted flux box and press the Apply elw}(l<F
button. The map will be redisplayed, and the Normalized Flux value will be equal o])2_e5
to the system transmittance. &] e uL:C
Example 2: Lighting Efficiency N,Ys}qP
Suppose you need to calculate the lighting efficiency of a luminaire in illuminating +pMjm&CF
a plane. You would probably choose the Surface Source raytrace option, and the q)E
J?-
emitted flux is equal to the flux you specified when you defined the sources. When a eo/4
you display an irradiance map, the total flux incident on the observation plane is ;zZGV4Qc~
displayed at the bottom of the window. The lighting efficiency is equal to the total p@x1B
&Z
flux divided by the emitted flux. To get the lighting efficiency directly, check the A"` (^#a
Normalize to emitted flux box and press the Apply button. The map will be (y;8izp9!
redisplayed, and the Normalized Flux value will be equal to the lighting efficiency {S;/+X,
of the luminaire.
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