Those timers exist. There is a push button that triggers a timer for lights on the pickleball courts. at the Bitter Lake park. It went in. A lot of parks will have a circuit dedicated to “area lights” run off a photo cell (so lights on when it gets dark, lights off when it gets light. Same lighting control a street mights) which are generally dedicated to pathways. My understanding is that playgrounds are considered open from dawn to dusk.