[Oni]

It's really not. These lights are controlled through software and don't always have to be on when the cam is on. The camera drivers dictate whether or not the light comes on when the cam does. All that's really needed is a modified driver for your model of camera.

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It's a possibility that some of them do have the functionality already written into them, but not all of them.

Physical, manually-opened shutters.

That was my assumption. Also why I said it wasn't far fetched.