| lightgirl |
2008-08-22 13:58 |
Normalize ~C6Qp`VF
Normalize the map data to the total emitted flux from all sources. ^ ;0.P)yGA
This option allows you to have the flux and irradiance normalized to the total ~GJJ{Bm_
emitted flux. When this box is checked, TracePro divides the values in the @N?A 0S/
irradiance map and the total flux by the emitted flux. This is especially useful for V3O<l}ak
calculating system transmittance for an optical system, or lighting efficiency for a ,>X
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lighting calculation. g6:S"Em
Example 1: System Transmittance b&s "/Y89
Suppose you need to calculate the system transmittance of an optical system. iOI8'`mk
You would probably use the grid raytrace option, and the emitted flux is equal to 1A;>@4iC0
the sum of the flux in all the emitted rays. When you display an irradiance map, Gj]*_"T
the system transmittance is equal to the total flux, displayed at the bottom of the j_ dCy
irradiance map window, divided by the emitted flux. To get the system 6; g_}Zx
transmittance, check the Normalize to emitted flux box and press the Apply Rckqr7q
button. The map will be redisplayed, and the Normalized Flux value will be equal d4h1#MK
to the system transmittance. zoYw[YP 9
Example 2: Lighting Efficiency {e4`D1B
Suppose you need to calculate the lighting efficiency of a luminaire in illuminating {S4^;Va1
a plane. You would probably choose the Surface Source raytrace option, and the Y>*{(QD
emitted flux is equal to the flux you specified when you defined the sources. When 0q`n] NM
you display an irradiance map, the total flux incident on the observation plane is e1ru#'z
displayed at the bottom of the window. The lighting efficiency is equal to the total Id3i qAL
flux divided by the emitted flux. To get the lighting efficiency directly, check the yD|He*$S
Normalize to emitted flux box and press the Apply button. The map will be ;`IZ&m $
redisplayed, and the Normalized Flux value will be equal to the lighting efficiency C
FY 3D|
of the luminaire.
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