> For the complete documentation index, see [llms.txt](https://faq.growsensor.co/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://faq.growsensor.co/the-grow-app/how-do-i-set-my-grows-night-and-day-photoperiods.md).

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

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

{% stepper %}
{% step %}
Navigate to your grow’s settings.
{% endstep %}

{% step %}
Select "Limits and Alerts.
{% endstep %}

{% step %}
At the top of this screen, you’ll find the photoperiod controls.
{% endstep %}

{% step %}
Click "Enable" and enter your lights on and lights off times
{% endstep %}
{% endstepper %}

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.

{% hint style="info" %}
**Important note:** When photoperiods are active, there’s a 20-minute transition window between night and day shifts. 
{% endhint %}

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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