Normalize U{;i 864:}
Normalize the map data to the total emitted flux from all sources. m xWaX b
This option allows you to have the flux and irradiance normalized to the total {
~Cqb7
emitted flux. When this box is checked, TracePro divides the values in the 4Q]+tXes
irradiance map and the total flux by the emitted flux. This is especially useful for [<%yU y
calculating system transmittance for an optical system, or lighting efficiency for a n,0}K+}
lighting calculation. 1
t#Tp$
Example 1: System Transmittance *</;:?
Suppose you need to calculate the system transmittance of an optical system. W=|B3}C?
You would probably use the grid raytrace option, and the emitted flux is equal to |mK d5[$
the sum of the flux in all the emitted rays. When you display an irradiance map, RuH Jk\T+
the system transmittance is equal to the total flux, displayed at the bottom of the >#kzPYsp
irradiance map window, divided by the emitted flux. To get the system 8n'C@#{WV
transmittance, check the Normalize to emitted flux box and press the Apply iWvgCm4
button. The map will be redisplayed, and the Normalized Flux value will be equal 0nl)0|?Az
to the system transmittance. 3 wr ~ P
Example 2: Lighting Efficiency aMHIOA%Kh
Suppose you need to calculate the lighting efficiency of a luminaire in illuminating Ek 4aC3
a plane. You would probably choose the Surface Source raytrace option, and the Z|~<B4#c
emitted flux is equal to the flux you specified when you defined the sources. When nmgW>U0jZh
you display an irradiance map, the total flux incident on the observation plane is hwO]{)%
displayed at the bottom of the window. The lighting efficiency is equal to the total PM_q"}-
flux divided by the emitted flux. To get the lighting efficiency directly, check the $GYy[- .`
Normalize to emitted flux box and press the Apply button. The map will be ]=pEs6%O3
redisplayed, and the Normalized Flux value will be equal to the lighting efficiency 9@S
icqx
of the luminaire.
