How does the light mode work?
The light sensor will react to whichever level you have set it to. It will recognize the amount of light you have set, then there is a 15 minute delay built in (to ensure it isn’t just a temporary shadow like a cloud), and then the door will open or close.
You can change the level to the setting you prefer, just always ensure that the level for closing is lower than the level for opening.
Please note that the location of your coop can also influence the light sensor. If there are trees around, or anything else that may create a darker atmosphere, it can take the door longer to open in the mornings.
The sensor works best under sunny conditions, so during darker months it can be useful to change the setting to the timer.