Does spotlight or floodlight camera have photocell?

In ring's support page, it says The lights on the Floodlight /Spotlight Cam will only turn on for motion events when it's dark. How was it achieved? I read many Amazon reviews saying those cameras do not have photocell, and does not have automatica dusk-to-dawn detection to control the light. It contradicts with the support page. Thus I am confused. Or the light control are actually time based via app? If so, if I put the camera in a dark room during day time, will the light be on when motion is detected?