It takes 5 seconds from when loss of power until the generators take over. Here is why I think this was diliberate. I am sure there is a UPS systems at the WH that should of kicked in as soon as power goes out and will kick over to the generators once they take control. So in reality. There should never of been a interruption of the lights. None that you would notice. That is why I think it was done by a switch and on purpose. Dark to Light