If you are talking about NS mode, then make use Source Ellipse or Rectangle with the following setting: ~ 5"JzT
1fU,5+PH
Source Distance = 0 *#
{z 3{+
|I;$M;'r&
Then use Source X and Y to adjust the angle of emission :mcYZPX#
=n(3o$r(
Hope this helps :)