| lightgirl |
2008-08-22 13:58 |
Normalize XIQfgrGZ
Normalize the map data to the total emitted flux from all sources. w0W9N%f#=
This option allows you to have the flux and irradiance normalized to the total nO-1^HUl
emitted flux. When this box is checked, TracePro divides the values in the
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irradiance map and the total flux by the emitted flux. This is especially useful for IJX75hE0g
calculating system transmittance for an optical system, or lighting efficiency for a [!Uzw 2
lighting calculation. `-Yo$b;:
Example 1: System Transmittance ~Q<h,P
Suppose you need to calculate the system transmittance of an optical system. 7 nr+X Os
You would probably use the grid raytrace option, and the emitted flux is equal to 2e~ud9,
the sum of the flux in all the emitted rays. When you display an irradiance map, 2Lravb3
the system transmittance is equal to the total flux, displayed at the bottom of the *\W
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irradiance map window, divided by the emitted flux. To get the system rqa?A } '
transmittance, check the Normalize to emitted flux box and press the Apply tR`'( *wh
button. The map will be redisplayed, and the Normalized Flux value will be equal w]2tb
to the system transmittance. B#Sg:L9Tr'
Example 2: Lighting Efficiency B,rpc\_
Suppose you need to calculate the lighting efficiency of a luminaire in illuminating lM0`yh
a plane. You would probably choose the Surface Source raytrace option, and the qU!xh )
emitted flux is equal to the flux you specified when you defined the sources. When +%Y`>1I^#
you display an irradiance map, the total flux incident on the observation plane is VI:EjZ/|a
displayed at the bottom of the window. The lighting efficiency is equal to the total N0U6N< w
flux divided by the emitted flux. To get the lighting efficiency directly, check the p\xi 5z
Normalize to emitted flux box and press the Apply button. The map will be ^uZ!e+
redisplayed, and the Normalized Flux value will be equal to the lighting efficiency Y ;qA@|
of the luminaire.
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