| lightgirl |
2008-08-22 13:58 |
Normalize c<|y/n
Normalize the map data to the total emitted flux from all sources. 0QZT<Zs
This option allows you to have the flux and irradiance normalized to the total rt*x[5<
emitted flux. When this box is checked, TracePro divides the values in the 0 (-4"u>?
irradiance map and the total flux by the emitted flux. This is especially useful for b=lJ`|
calculating system transmittance for an optical system, or lighting efficiency for a .|[{$&B
lighting calculation. bfz7t!A)A
Example 1: System Transmittance rq3f/_#L!O
Suppose you need to calculate the system transmittance of an optical system. ^>l <)$s
You would probably use the grid raytrace option, and the emitted flux is equal to t7-]OY7%w_
the sum of the flux in all the emitted rays. When you display an irradiance map, *G.vY # h
the system transmittance is equal to the total flux, displayed at the bottom of the k^%=\c
irradiance map window, divided by the emitted flux. To get the system 8S8qj"s
transmittance, check the Normalize to emitted flux box and press the Apply e1W9"&4>G{
button. The map will be redisplayed, and the Normalized Flux value will be equal _rYW|*cIF
to the system transmittance. $}W T"K
Example 2: Lighting Efficiency J;_4
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Suppose you need to calculate the lighting efficiency of a luminaire in illuminating -yqgs>R( d
a plane. You would probably choose the Surface Source raytrace option, and the O
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emitted flux is equal to the flux you specified when you defined the sources. When EX_j|/&tZ
you display an irradiance map, the total flux incident on the observation plane is $4g {4-)
displayed at the bottom of the window. The lighting efficiency is equal to the total DK?aFSf\
flux divided by the emitted flux. To get the lighting efficiency directly, check the j<(E %KN3
Normalize to emitted flux box and press the Apply button. The map will be =8 @DYz'
redisplayed, and the Normalized Flux value will be equal to the lighting efficiency }
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of the luminaire.
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