The idiom on and off means inconsistently or wavering in certainty, which is how the security cameras' red lights are behaving.
Context: "The only things that ruined the elegance of the room were the security cameras mounted to the walls, their red lights winking  inconsistently and wavering in certainty like devilish fireflies as they swiveled around in slow, steady circles."
Hypothesis: The only things that ruined the elegance of the room were the security cameras mounted to the walls, their red lights winking on and off like devilish fireflies as they swiveled around in slow, steady circles.
Based on the context, is the hypothesis true, false, or unknown?