I know this will make me sound old, but back in my day, that was called "glow in the dark," and you didn't need any batteries. I love it when people try to "reinvent" something by taking it backwards.
Light sensor wall clock illuminates with a pleasant green glow the moment the lights dim so you are never left in the dark when it comes to time. Traditional design with a unique twist! Requires four AA batteries, not included. Plastic, 12". $24.98