The LTL Temp by LTL Controls allows the user to program separate Day and Night temperatures. A water-resistant temperature controller with a built-in photocell, the LTL Temp can be used to control the temperature. The LTL Temp by LTL Controls allows the user to program separate Day and Night temperatures. A water-resistant temperature controller with a built-in photocell, the LTL Temp can be used to control a heating or cooling device to accurately and automatically maintain the desired temperature within the growing area.