My lunar lights are always on. There isn't a setting to turn then off unless you set them to zero. Then you would not have any lunar lights at all. I need to make a last visit before bed.Ya it’s only full power for 8hrs but it’s always ramping either up and down which makes the tank look nice. I had to find a setting that worked for me because I like my tank to be lit everytime I look at it regardless of time lol