| lightgirl |
2008-08-22 13:58 |
Normalize PQ" Dl =,
Normalize the map data to the total emitted flux from all sources. =zdRoXBY[b
This option allows you to have the flux and irradiance normalized to the total ryP z q}#
emitted flux. When this box is checked, TracePro divides the values in the lf 3W:0 K
irradiance map and the total flux by the emitted flux. This is especially useful for $l=m?r=
calculating system transmittance for an optical system, or lighting efficiency for a V! p;ME
lighting calculation. r.[k D"l
Example 1: System Transmittance u56cT/J 1
Suppose you need to calculate the system transmittance of an optical system. 3 }XS| Y
You would probably use the grid raytrace option, and the emitted flux is equal to ``{xm1GK
the sum of the flux in all the emitted rays. When you display an irradiance map, 3~ylBJJ
the system transmittance is equal to the total flux, displayed at the bottom of the wXe.z LQ
irradiance map window, divided by the emitted flux. To get the system <?+ \\Z!7
transmittance, check the Normalize to emitted flux box and press the Apply @L0.Z1 ).
button. The map will be redisplayed, and the Normalized Flux value will be equal YRFM1?*
to the system transmittance. $P$OWp?b
Example 2: Lighting Efficiency zrcSPh
Suppose you need to calculate the lighting efficiency of a luminaire in illuminating pV_2JXM~@
a plane. You would probably choose the Surface Source raytrace option, and the d}1R<Q;F
emitted flux is equal to the flux you specified when you defined the sources. When z@ 2NAC
you display an irradiance map, the total flux incident on the observation plane is `J;_!~:
displayed at the bottom of the window. The lighting efficiency is equal to the total OvkY zI`
flux divided by the emitted flux. To get the lighting efficiency directly, check the YIfbcR5
Normalize to emitted flux box and press the Apply button. The map will be z?7pn }-
redisplayed, and the Normalized Flux value will be equal to the lighting efficiency b@Fa| >"_
of the luminaire.
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