| lightgirl |
2008-08-22 13:58 |
Normalize lX/ :e=
Normalize the map data to the total emitted flux from all sources. '4,>#D8@O
This option allows you to have the flux and irradiance normalized to the total lD6PKZ\RIj
emitted flux. When this box is checked, TracePro divides the values in the CtE <9?
irradiance map and the total flux by the emitted flux. This is especially useful for GU7f27p
calculating system transmittance for an optical system, or lighting efficiency for a #PQhgli
lighting calculation. KEo?Cy?%ff
Example 1: System Transmittance n. .R'vNj
Suppose you need to calculate the system transmittance of an optical system. d' []
You would probably use the grid raytrace option, and the emitted flux is equal to `!y/$7p
the sum of the flux in all the emitted rays. When you display an irradiance map, 4 %5 +
the system transmittance is equal to the total flux, displayed at the bottom of the =`.OKU An
irradiance map window, divided by the emitted flux. To get the system V vTi>2(.
transmittance, check the Normalize to emitted flux box and press the Apply FY"cs Z
button. The map will be redisplayed, and the Normalized Flux value will be equal La
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to the system transmittance. oa6&?4K?F
Example 2: Lighting Efficiency f7 I!o, /
Suppose you need to calculate the lighting efficiency of a luminaire in illuminating e@{Rlz
a plane. You would probably choose the Surface Source raytrace option, and the tg C)vZ&a
emitted flux is equal to the flux you specified when you defined the sources. When 'M,O(utGv
you display an irradiance map, the total flux incident on the observation plane is V z-]H]MW,
displayed at the bottom of the window. The lighting efficiency is equal to the total uA~?z :~=
flux divided by the emitted flux. To get the lighting efficiency directly, check the v0KJKrliGO
Normalize to emitted flux box and press the Apply button. The map will be Z ty9 O8g
redisplayed, and the Normalized Flux value will be equal to the lighting efficiency M=Y['w x
of the luminaire.
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