The
lights are on separate timers. The Actinics come on at noon and the
Daylights follow at 1:00 p.m. The Daylights shut off at 11:00 p.m.,
and the Actinics shut off at midnight. I chose those hours for the simple
reason that I get home from work
late in the afternoon, so most of my viewing time is at night. The CSL
Moonlite is on 24 hours a day, but is only visible when all the other lights are
off. It was a nice little addition that allows me to view the tank
at night without the use of a flashlight.