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Unless you can be at your cannabis plantation every single day and switch the lights and ventilation on and off in a 12/12 or 18/6 schedule, you will need timers to do it automatically for you. Since most growers operate in the day/night cycle, providing a few hours of darkness to their plants every day, such devices make life much easier. Along with the light source, often the exhaust fan is being turned off as well - just as is the CO2 generator, if you use one.

There is a wide choice of timers, ranging from the "made in china" sort that can cause your lamps and fans to die prematurely, through simple but high quality kind, to professional high voltage multiple socket devices for commercial growers.

The most simple ones look like a single socket extension with a sort of a clock, that has 4 switches per every hour, thus allowing you to regulate the schedule with a 15 minutes precision. More advanced ones offer multiple sockets and a digital setup.

What you have to take into account is a relatively high power of the HID (HPS and MH) lamps - a 600W ballast can take few times as much during the short period just after the start. This might cause the lower grade devices to fail, as they are made to control Christmas tree lights rather than regulate a professional marijuana production sites...