Cannonfodder, your idea at the end of your post is certainly viable, but may or may not be the best course of action. Due to a volatile environment, most schools of thought believe that lighting up a target for a long period of time, during an actual shooting situation, is not ideal, a quick burst of light, and then fire if warranted. But most of the time it is hoped that the target will surrender upon the initial burst of light. That's why you light up briefly and then move. If you need to light up again you are not in the same place and you will once again cause the utmost confusion possible in the target. The longer you stay in one place the more dangerous it becomes to you. there are times of course where shooting and identifying happen all in the same time, but leaving the light on allows for the target to get used to the light, and focus in on the light's source to return fire, this is not good. As well most often, or so I have been told, it's low light situations, not no light, which means you might be able to see well enough to target someone, but not well enough to identify them. Once you've accomplished the identifying of your target, they are now blinded from the light, unable to see you easily, you've moved and can still see them, therefore a laser will aid in your target acquisition if you choose to fire. Of course laser's aren't necessary, and good night sights can accomplish the same thing. On handguns, a handheld light and weapon mounted laser can work wonders, or both on the gun. On long arms it's typically a weapon mounted light and laser, either individually or together. I know the teams that use my facility to train in don't currently have any lasers mounted, although they would like them.
again to summarize, lighting up a target with constant illumination allows for easier targeting of you as the target gets used to the light and track it's source. It also hinders your ability to move and not be noticed. Moving light is very easy to follow. Due to the brightness of the lights I am talking about (if I remember correctly you have to be over 100 Lumens) a quick flash is all that is needed to cause both auditory and visual exclusion and also shut down the thinking centers of the targets brain, momentarily. Loss of balance, ability to process thought, tunnel vision and tunnel hearing are all things that can and often do happen during sudden exposure to bright lights. This must be exploited by the user as much as possible, to gain as many advantages as possible. The most important of these in a hostile environment is movement. And if you can move without being noticed, which the above helps to cause, so much the better.