Hi Bantha,  Grüße von der Bauruine am Fluß, die mal (wieder) ein Einkaufzentrum werden will ... irgendwann in diesem Jahrtausend ...

Bagginsbill, short question only for general understanding:  Is that Alitalia formula ... oops, KLM formula specific to cg rendered light ? Cause you have the light intensity in it. As far as I know in reality light will not operate in a linear manner.  So doubling light at it's origin not neccessarily mean's to have the double quantity at the goal.
B.t.w. could you have a look to my material thread, please ... needing a kick ...