If you are modelling illuminating effect, most likely you will model the system under non-sequential mode and you could look up >JNdtP8s/1
%Ja0:e
Source Diode and Source Gaussian h8WM4
PK
hvI#D>Z!Yp
to check if these two sources types support your source behavior. If they do then it should serve an good approximation for your light source.