| lightgirl |
2008-08-22 13:58 |
Normalize MZ8jL,a^
Normalize the map data to the total emitted flux from all sources. DB^"iof
This option allows you to have the flux and irradiance normalized to the total FZEK-]h.
emitted flux. When this box is checked, TracePro divides the values in the ?rD`'B
irradiance map and the total flux by the emitted flux. This is especially useful for ^rKA=siz
calculating system transmittance for an optical system, or lighting efficiency for a ;I#S m;
lighting calculation. RRNoX }
Example 1: System Transmittance Eoj 2l&\
Suppose you need to calculate the system transmittance of an optical system. a s{^~8B
You would probably use the grid raytrace option, and the emitted flux is equal to % 1+\N
the sum of the flux in all the emitted rays. When you display an irradiance map, p:hzLat~
the system transmittance is equal to the total flux, displayed at the bottom of the B~/ LAD_
irradiance map window, divided by the emitted flux. To get the system ww]^H$In
transmittance, check the Normalize to emitted flux box and press the Apply r*'X ]q|L+
button. The map will be redisplayed, and the Normalized Flux value will be equal C XQPbt[5
to the system transmittance. G*;}6 bj|?
Example 2: Lighting Efficiency E f1R?<
Suppose you need to calculate the lighting efficiency of a luminaire in illuminating fDn| o"
a plane. You would probably choose the Surface Source raytrace option, and the ? Q`Sx
emitted flux is equal to the flux you specified when you defined the sources. When \qrSJ=}t
you display an irradiance map, the total flux incident on the observation plane is )m-l&U K
displayed at the bottom of the window. The lighting efficiency is equal to the total J#0oL_xY#
flux divided by the emitted flux. To get the lighting efficiency directly, check the 86^xq#+Uw
Normalize to emitted flux box and press the Apply button. The map will be Rv)!p~V8
redisplayed, and the Normalized Flux value will be equal to the lighting efficiency l#FW#`f
of the luminaire.
|
|