| lightgirl |
2008-08-22 13:58 |
Normalize zu(/ c
Normalize the map data to the total emitted flux from all sources. |q^e&M<
This option allows you to have the flux and irradiance normalized to the total 8UwL%"?YB
emitted flux. When this box is checked, TracePro divides the values in the LDBxw
irradiance map and the total flux by the emitted flux. This is especially useful for yrR<F5xge
calculating system transmittance for an optical system, or lighting efficiency for a v[e$ RH
lighting calculation. m0paGG
Example 1: System Transmittance +z+25qWi
Suppose you need to calculate the system transmittance of an optical system. D`3}j
You would probably use the grid raytrace option, and the emitted flux is equal to l@q.4hT
the sum of the flux in all the emitted rays. When you display an irradiance map, .Z xSJ"Rk
the system transmittance is equal to the total flux, displayed at the bottom of the #?}k0Y
irradiance map window, divided by the emitted flux. To get the system &?9p\oY[
transmittance, check the Normalize to emitted flux box and press the Apply `XP ]y=
button. The map will be redisplayed, and the Normalized Flux value will be equal $ n`<,;^l
to the system transmittance. %LXk9K^]e
Example 2: Lighting Efficiency }=^YL u=
Suppose you need to calculate the lighting efficiency of a luminaire in illuminating *^=`HE89S
a plane. You would probably choose the Surface Source raytrace option, and the 64#~ p)
emitted flux is equal to the flux you specified when you defined the sources. When 6?+bi\6
you display an irradiance map, the total flux incident on the observation plane is W |G(x8
displayed at the bottom of the window. The lighting efficiency is equal to the total 8~ .r/!wfy
flux divided by the emitted flux. To get the lighting efficiency directly, check the IxYuJpi
Normalize to emitted flux box and press the Apply button. The map will be x/~V
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redisplayed, and the Normalized Flux value will be equal to the lighting efficiency r,2x?Qi
of the luminaire.
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