The iGS-011L is a cycle timer that allows lighting duration from 8 to 18 hours and darkness duration from 6 to 16 hours. A grower can set a complete day-night cycle from 14 to 34 hours! The iGS-011L offers a 2 minute minimum memory in case of a power outage and can be used with incandescant, fluorescent or HID lighting. For lighting loads on 240V or 120V but in excess of 15A, the iGS-011L can also control lighting load switcher boxes or panels activated by external 120 v triggering cords such as The Plug'n'Grow iLS4 line with models for 120v or 240v lighting equipments. CSA/UL approved.