算光效率 ,可以尝试使用归一化啊。 S~DY1e54GF  
 System Transmittance R!LKGiN  
Suppose you need to calculate the system transmittance of an optical system. }D	eW2Jp  
You would probably use the grid raytrace option, and the emitted flux is equal to Gk5SG_o  
the sum of the flux in all the emitted rays. When you display an irradiance map, )z?Kq0  
the system transmittance is equal to the total flux, displayed at the bottom of the Bh,LJawE  
irradiance map window, divided by the emitted flux. To get the system D?"TcA  
transmittance, check the Normalize to emitted flux box and press the Apply %S<(	z5  
button. The map will be redisplayed, and the Normalized Flux value will be equal T"m(V/L$W  
to the system transmittance.