LighttoolS的illumination module user's guide里面第一章光源定義里有這樣一段話(huà) 在P18 ]}dQ~lOE  
Sources have the following characteristics: ')U~a  
type: H
1I^Vij  
shape: u<Y#J,p`e  
power or flux B*N1)J\5  
spectral region sxsb)a  
emitting direction #~!"`B?#*  
spatial distribution 3V<@Vkf5  
angular distribution 
];Z6=9n  
weight(importance)factor ;