| lightgirl |
2008-08-22 13:58 |
Normalize ..]B9M.
Normalize the map data to the total emitted flux from all sources. g9! d pP
This option allows you to have the flux and irradiance normalized to the total ,\Z8*Jr3Q
emitted flux. When this box is checked, TracePro divides the values in the w 2 s,
irradiance map and the total flux by the emitted flux. This is especially useful for N n:m+ZDo^
calculating system transmittance for an optical system, or lighting efficiency for a xU: PhhS
lighting calculation. I(F1S,7
Example 1: System Transmittance 69 [w/\
Suppose you need to calculate the system transmittance of an optical system. $K;_Wf
You would probably use the grid raytrace option, and the emitted flux is equal to N 7%=K9
the sum of the flux in all the emitted rays. When you display an irradiance map, Pau&4h0
the system transmittance is equal to the total flux, displayed at the bottom of the /o~
@VF:
irradiance map window, divided by the emitted flux. To get the system ZD
iW72&Q
transmittance, check the Normalize to emitted flux box and press the Apply V:$[~)k8
button. The map will be redisplayed, and the Normalized Flux value will be equal 8j({=xbg&
to the system transmittance. tauP1&%oH{
Example 2: Lighting Efficiency `=WzG"
Suppose you need to calculate the lighting efficiency of a luminaire in illuminating mvxc[
a plane. You would probably choose the Surface Source raytrace option, and the '&&~IB4ud
emitted flux is equal to the flux you specified when you defined the sources. When *NKC \aV`0
you display an irradiance map, the total flux incident on the observation plane is a .B\=3xn
displayed at the bottom of the window. The lighting efficiency is equal to the total t(Cq(.u` :
flux divided by the emitted flux. To get the lighting efficiency directly, check the :z}~U3,JE
Normalize to emitted flux box and press the Apply button. The map will be e{d_p %(
redisplayed, and the Normalized Flux value will be equal to the lighting efficiency X*D5y8<
of the luminaire.
|
|