| lightgirl |
2008-08-22 13:58 |
Normalize H{U(Rt]K
Normalize the map data to the total emitted flux from all sources. vlVHoF;&
This option allows you to have the flux and irradiance normalized to the total :D:Y-cG*n<
emitted flux. When this box is checked, TracePro divides the values in the q~6a$ 8+t
irradiance map and the total flux by the emitted flux. This is especially useful for o>75s#=
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calculating system transmittance for an optical system, or lighting efficiency for a /H~]5JZ3-E
lighting calculation. tb/`*Yl @
Example 1: System Transmittance x%`tWE|
Suppose you need to calculate the system transmittance of an optical system. &hu3A)%
You would probably use the grid raytrace option, and the emitted flux is equal to E>i sl"
the sum of the flux in all the emitted rays. When you display an irradiance map, z*e`2n#\
the system transmittance is equal to the total flux, displayed at the bottom of the E++3GagdiD
irradiance map window, divided by the emitted flux. To get the system fM!@cph (8
transmittance, check the Normalize to emitted flux box and press the Apply }DFZ9,gQ
button. The map will be redisplayed, and the Normalized Flux value will be equal <V1y^EW0
to the system transmittance. @B9O*x+n:
Example 2: Lighting Efficiency 2Kz407|'
Suppose you need to calculate the lighting efficiency of a luminaire in illuminating yW@YW_2;4
a plane. You would probably choose the Surface Source raytrace option, and the <RCeY(1
emitted flux is equal to the flux you specified when you defined the sources. When k2:mIp\
you display an irradiance map, the total flux incident on the observation plane is ge|Cv v
displayed at the bottom of the window. The lighting efficiency is equal to the total PwC^
]e
flux divided by the emitted flux. To get the lighting efficiency directly, check the l S |:4U.
Normalize to emitted flux box and press the Apply button. The map will be 8d[!"lL
redisplayed, and the Normalized Flux value will be equal to the lighting efficiency chXTFLC~
of the luminaire.
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