Best advice I've heard here is to stay barricaded up, calling 911, with weapons at the ready.
If you MUST leave your barricade, I think it's a good idea to have low intensity nightlights throughout the house that come on when it gets dark. While these give you enough light to shoot by, they still might not provide enough to ID the target, which you must do before shooting. Once you've got the target covered, if necessary a quick flash from a bright flashlight held out by the weakside hand should take care of that problem. I agree that a weapon-mounted light makes you a brightly lit target.
A decent alarm system, like ADT, might obviate the need for any of these measures, and doesn't cost much more than some of the ultra-tactical lights now available. Defense in depth...
If you want to shoot...shoot...don't talk! Tuco
USAF Munitions 1969-1992