would anybody care to expand on this further?
I haven't "seen the elephant", as they say, but maybe I can take a stab at it...
There are several "threat indicators". That is, cues that can reveal (among other things) the position of a threat; these may be sound, movement, smell, etc. These obviously work both ways and a person in a defensive position should be aware of which of these cues they may be projecting.
Under low light, you can add light as a powerful indicator of "something" going on. It's pretty obvious, really. Somebody has to be activating the light, after all. If you're a BG, the obvious thing to do is shoot at the light, in hopes of hitting you. In every single FoF scenario I've been in, the BG has shot at the light.
If you're the one holding the light, it's important to be aware of this and find was to minimize the risk and increase your tactical advantage. You definitely don't want to get shot at! As a lawfully armed citizen, you also are required to verify what you are shooting at, so it's a fine balance between survival tactics, and the legal requirements of any self defense situation where lethal force is in place. "Light management" is critical.
I'm not sure if that answers your question...