# How do I set my grow’s night and day photoperiods?

To set your night and day photoperiods, follow these steps:

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Navigate to your grow’s settings.
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Select "Limits and Alerts.
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At the top of this screen, you’ll find the photoperiod controls.
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Click "Enable" and enter your lights on and lights off times
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Once enabled, your photoperiods will split your alerts into day and night sections. If photoperiods are disabled, you’ll have a single continuous set of limits and alerts.

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**Important note:** When photoperiods are active, there’s a 20-minute transition window between night and day shifts. 
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During this period, the Grow Sensor takes the highest and lowest limit across both settings and will alert you if a limit is reached (provided push notifications are enabled)

Any questions, contact us at <support@growsensor.co>.

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