LighttoolS的illumination module user's guide里面第一章
光源定義里有這樣一段話 在P18
SB2I j', Sources have the following characteristics:
j+>&~ type:
*f( e`3E shape:
Hs6}~d power or flux
kv'gs+,e spectral region
Cu +u'&U! emitting direction
Luu.p < spatial distribution
:
