On average, your greens enjoy 12 hours of light a day. With the Fieldhouse, this is easy to manage with the integrated timer. First press the On / Off button to turn the light on. Once on, press the timer button to activate the 12 hour cycle. The light will glow twice to indicate you've entered timer mode. This will repeat for 7 cycles / 7 days. After this the light will turn off and you can repeat the cycle again as needed. Keep in mind that microgreens only need to be exposed to light after germination, once 85-90% or more of the seeds have sprouted. Typically after the 2nd or 3rd day. Learn more about Using Your Grow Lights and Germination.