| lightgirl |
2008-08-22 13:58 |
Normalize D!&(#Vl
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Normalize the map data to the total emitted flux from all sources. xR 1G
This option allows you to have the flux and irradiance normalized to the total =j,WQ6 6r3
emitted flux. When this box is checked, TracePro divides the values in the B ?VTIq>
irradiance map and the total flux by the emitted flux. This is especially useful for 6z 9
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calculating system transmittance for an optical system, or lighting efficiency for a
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lighting calculation. Rg?6e N
Example 1: System Transmittance Z4] n<~o
Suppose you need to calculate the system transmittance of an optical system. Op'a=4x]
You would probably use the grid raytrace option, and the emitted flux is equal to [%P#ieD4
the sum of the flux in all the emitted rays. When you display an irradiance map, w"^h<]b
the system transmittance is equal to the total flux, displayed at the bottom of the Pv'Q3O2<I
irradiance map window, divided by the emitted flux. To get the system X$Vi=f vt
transmittance, check the Normalize to emitted flux box and press the Apply X NJ4T]><
button. The map will be redisplayed, and the Normalized Flux value will be equal "}]$ag!`q$
to the system transmittance. z K<af
Example 2: Lighting Efficiency ZL!u$)(V
Suppose you need to calculate the lighting efficiency of a luminaire in illuminating ?%s>a8w
a plane. You would probably choose the Surface Source raytrace option, and the iQ)yd Y a
emitted flux is equal to the flux you specified when you defined the sources. When ||Zup\QB
you display an irradiance map, the total flux incident on the observation plane is [oLV,O|s|j
displayed at the bottom of the window. The lighting efficiency is equal to the total gF)9a_R%p
flux divided by the emitted flux. To get the lighting efficiency directly, check the 3z+l-QO8
Normalize to emitted flux box and press the Apply button. The map will be isZ5s \
redisplayed, and the Normalized Flux value will be equal to the lighting efficiency %nZl`<M
of the luminaire.
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