| lightgirl |
2008-08-22 13:58 |
Normalize 1,(uRS#bk
Normalize the map data to the total emitted flux from all sources.
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This option allows you to have the flux and irradiance normalized to the total 'qnnZE
emitted flux. When this box is checked, TracePro divides the values in the ui4*vjd
irradiance map and the total flux by the emitted flux. This is especially useful for [ ;8vO=Z
calculating system transmittance for an optical system, or lighting efficiency for a @Yy']!Ju
lighting calculation. (Gpk;DD
Example 1: System Transmittance K!on V3mR
Suppose you need to calculate the system transmittance of an optical system. mZb[Fi
You would probably use the grid raytrace option, and the emitted flux is equal to Rln JlY/
the sum of the flux in all the emitted rays. When you display an irradiance map, F ]7$Y
the system transmittance is equal to the total flux, displayed at the bottom of the \<4Hp_ 2?
irradiance map window, divided by the emitted flux. To get the system ;O Y*`(Id
transmittance, check the Normalize to emitted flux box and press the Apply ,? ci+M)
button. The map will be redisplayed, and the Normalized Flux value will be equal BHEZ<K[U
to the system transmittance. 8
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Example 2: Lighting Efficiency &W:R#/|
Suppose you need to calculate the lighting efficiency of a luminaire in illuminating P},d`4Ty@
a plane. You would probably choose the Surface Source raytrace option, and the YMTB4|{
emitted flux is equal to the flux you specified when you defined the sources. When 'k 9dN
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you display an irradiance map, the total flux incident on the observation plane is n;,>Fv
displayed at the bottom of the window. The lighting efficiency is equal to the total M}*#{UV2
flux divided by the emitted flux. To get the lighting efficiency directly, check the 3f^~mTY9>]
Normalize to emitted flux box and press the Apply button. The map will be ~<&47'D
redisplayed, and the Normalized Flux value will be equal to the lighting efficiency okv`v
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of the luminaire.
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