The effect from a searchlight doesn't last long enough in Il-2 and is closer to what one would expect if the eye was undilated (daytime). It is known that bombers were extremely vulnerable for up to a couple of minutes after they got hit by a search light (assuming that they were at low altitude and it was a dark night).
Oleg states that there is quite a bit of variation between indivduals and that I should conduct experiments using a flashlight on myself and others. I think I actually suggest he do this a few years back...
If anyone has quality data (academic journal type) it would probably be a good idea to pass it on.