A timer is needed to automaticly and safely switch the grow lights on and off. In order to protect the timer from high start up currents most have timer contacters or relays. A common effect when if you don’t use a contactor when using a timer with a HID grow light is that the timer can become damaged and will not switch back off. This can leave your lights on continuously until you next check on them and this can cause havoc with the growth cycle of your plants.
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