It's just 2 lamps in one fixture, you can use a 2 channel timer to program both, or 2 individual timers. Still have to adjust temps by bulb wattage unless you wire in dimmers, or my solution, a channel from your thermostat to a heat emitter to regulate air temps, and a low wattage or LED day bulb on a timer for day/night cycle, gotta watch though heat emitters in small dual fixtures can get hot enough to melt some LED/CFL bulbs .