| lightgirl |
2008-08-22 13:58 |
Normalize c\b>4 &n
Normalize the map data to the total emitted flux from all sources. T&23Pf 1
This option allows you to have the flux and irradiance normalized to the total zm .2L
emitted flux. When this box is checked, TracePro divides the values in the er#=xqUY
irradiance map and the total flux by the emitted flux. This is especially useful for z*[Z:
calculating system transmittance for an optical system, or lighting efficiency for a M1M]]fT0ME
lighting calculation. n|*V
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Example 1: System Transmittance zLn#p]
Suppose you need to calculate the system transmittance of an optical system. 5nn*)vK {
You would probably use the grid raytrace option, and the emitted flux is equal to QE}@|H9xs
the sum of the flux in all the emitted rays. When you display an irradiance map, g:clSN,
the system transmittance is equal to the total flux, displayed at the bottom of the yN o8R[M
irradiance map window, divided by the emitted flux. To get the system an2Tc*=~l(
transmittance, check the Normalize to emitted flux box and press the Apply ZF/K V\Ag)
button. The map will be redisplayed, and the Normalized Flux value will be equal <FK><aA_i*
to the system transmittance. a wK'XFk
Example 2: Lighting Efficiency nJya1AH;
Suppose you need to calculate the lighting efficiency of a luminaire in illuminating R`&ioRWj
a plane. You would probably choose the Surface Source raytrace option, and the T7Ac4LA
emitted flux is equal to the flux you specified when you defined the sources. When >dl!Ep
you display an irradiance map, the total flux incident on the observation plane is K]oPh:E
displayed at the bottom of the window. The lighting efficiency is equal to the total w8i!Qi#y5D
flux divided by the emitted flux. To get the lighting efficiency directly, check the Z%R% D*f@y
Normalize to emitted flux box and press the Apply button. The map will be gZUy0`E
redisplayed, and the Normalized Flux value will be equal to the lighting efficiency O?WaMfS[1
of the luminaire.
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