| lightgirl |
2008-08-22 13:58 |
Normalize w+][L||4c
Normalize the map data to the total emitted flux from all sources. |-Q="7b%
This option allows you to have the flux and irradiance normalized to the total ,>3b|-C-
emitted flux. When this box is checked, TracePro divides the values in the wl N l|+ K
irradiance map and the total flux by the emitted flux. This is especially useful for $aC%&&+wG
calculating system transmittance for an optical system, or lighting efficiency for a =a $7^d
lighting calculation. SdXAL
Example 1: System Transmittance 9i`MUE1Sh
Suppose you need to calculate the system transmittance of an optical system. [M#I Nm}
You would probably use the grid raytrace option, and the emitted flux is equal to rD!UP1Nb
the sum of the flux in all the emitted rays. When you display an irradiance map, :G4)edwe
the system transmittance is equal to the total flux, displayed at the bottom of the ?
4v"y@v
irradiance map window, divided by the emitted flux. To get the system } $oZZKS
transmittance, check the Normalize to emitted flux box and press the Apply Yg LHp /
button. The map will be redisplayed, and the Normalized Flux value will be equal y.aeXlc[
to the system transmittance. z{ (c-7*
Example 2: Lighting Efficiency j"Z9}F@
Suppose you need to calculate the lighting efficiency of a luminaire in illuminating L"It0C
a plane. You would probably choose the Surface Source raytrace option, and the $_+.D`vx`
emitted flux is equal to the flux you specified when you defined the sources. When _edT+ r>+
you display an irradiance map, the total flux incident on the observation plane is lEC91:Jyt
displayed at the bottom of the window. The lighting efficiency is equal to the total *@E&O^% cO
flux divided by the emitted flux. To get the lighting efficiency directly, check the 2PViY,V|
Normalize to emitted flux box and press the Apply button. The map will be +5N09$f;R
redisplayed, and the Normalized Flux value will be equal to the lighting efficiency _zG[ b/:p
of the luminaire.
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