| lightgirl |
2008-08-22 13:58 |
Normalize N<ww&GXBX
Normalize the map data to the total emitted flux from all sources. IpQ 51
This option allows you to have the flux and irradiance normalized to the total l+S08IZ
emitted flux. When this box is checked, TracePro divides the values in the v|~ yIywf
irradiance map and the total flux by the emitted flux. This is especially useful for Hs<vCL \
calculating system transmittance for an optical system, or lighting efficiency for a R iid,n
lighting calculation. az3rK4g
Example 1: System Transmittance 6bC C6G
Suppose you need to calculate the system transmittance of an optical system. dE2(PQb*P
You would probably use the grid raytrace option, and the emitted flux is equal to rk W*C'2fz
the sum of the flux in all the emitted rays. When you display an irradiance map, c,;-[sn
the system transmittance is equal to the total flux, displayed at the bottom of the ZK4/o
irradiance map window, divided by the emitted flux. To get the system Q}ho
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transmittance, check the Normalize to emitted flux box and press the Apply ?}y?e}y*xZ
button. The map will be redisplayed, and the Normalized Flux value will be equal O
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to the system transmittance. lTsl=
Example 2: Lighting Efficiency y8jk 9Tv
Suppose you need to calculate the lighting efficiency of a luminaire in illuminating >_h *N H
a plane. You would probably choose the Surface Source raytrace option, and the { 4tJT25
emitted flux is equal to the flux you specified when you defined the sources. When B@dA ?w.x
you display an irradiance map, the total flux incident on the observation plane is cMxTv4|wui
displayed at the bottom of the window. The lighting efficiency is equal to the total -%"Kxe
flux divided by the emitted flux. To get the lighting efficiency directly, check the G&MI@Hq
Normalize to emitted flux box and press the Apply button. The map will be T:S+P t~
redisplayed, and the Normalized Flux value will be equal to the lighting efficiency z>+@pj
of the luminaire.
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