the question is....is the WH dark every night?....routinely?..I have no idea.
Picture # 2 at this link seems to suggest it has been lit at night.
https://www.rd.com/list/white-house-facts/
"Originally Published: January 19, 2021"
Date on the photo is December 2016.
https://www.rd.com/wp-content/uploads/2016/12/02_Bigger_14104774063_b29810768e_o.jpg?fit=640,427
What Are the Rules for Flying the U.S. Flag at Night?
"The U.S. flag is traditionally flown from dawn to dusk so that it is always illuminated by the sun. It is allowed to be flown at night under certain guidelines, however. Since it must always be illuminated during the day, the same holds true for the night. A floodlight or spotlight must be shown on the flag. This is simple enough to do by placing a floodlight on the ground under the flagpole."
"There are eight places in the United States where official proclamations and laws have stated that a flag must be flown 24 hours a day. These are: Fort McHenry National Monument and Historic Shrine; Flag House Square; United States Marine Corps Memorial; on the green in Lexington, Massachusetts; the White House; the Washington Monument; United States Customs Ports of Entry; and the grounds of the National Memorial Arch in Valley Forge, Pennsylvania."
Hi Cherry, I was curious about that too, so one night about a year ago I walked out onto the Ellipse adjacent to the White House and asked one of the policemen there that very question.
At that time he told me that they turned the White House lights (exterior) off at about 11:00 p.m.
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Mustang Guy has been wandering DC and asked USSS I believe and they told him yes.