Darkness is nothingness. All it takes to produce darkness is for the sources of light to be extinguished. A candle can light up a dark room until it runs out of fuel or it is blown by a gust of wind.
Don’t you just wish sometimes that we Christians had a list of things that we can or cannot do; words that we can or cannot say; beverages that we can or cannot drink and foods that we can or cannot eat. In Paul’s first letter to the Corinthians, he tells them that “everything is permissible.” That is actually a good thing.