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 :{4C2qK>  
Sources have the following characteristics: :s\zk^h?  
type: =CO)
Q2  
shape: ~f"3Wa*\B  
power or flux |}UA=? Xl  
spectral region `NsQ&G  
emitting direction ]_|'N7J  
spatial distribution "a9j2+9  
angular distribution {~w(