A timer is a vital piece of equipment for grow lights. With a timer, you don’t have to worry about remembering to turn lights on or off. That chore is taken care of! There are a lot of timers on the market – some that are simpler and many that are more complex. NOTE: This timer works with our Procyon 2.0 series but is not suitable for the PRO series because it is a 2-prong, rather than a 3-prong connection.