A light profile determines the light level settings of a fixture. The sensor uses the light levels along with the time of day, day of the week, and time duration to control the fixture’s light level.
The light profiles support four periods of the day: Morning, Day, Evening, and Night. The Day and Evening time periods may be set based on the astronomical clock, which provides the sunrise and sunset time. You take advantage of the ample daylight available before and after sunrise or sunset when light profiles are set based on the astronomical clock. The sunrise and sunset time are based on the building’s latitude and longitude settings. See Edit Building's Location Data.
If you are creating an outdoor lighting profile based on the astronomical clock, set the Day profile to have 0 minimum and 0 maximum light levels to ensure that lights are off during the day. Set the Evening, Night, and Morning periods to a minimum value greater than 0 to ensure that there is always light after sunset and before sunrise.
The Day profile is applied when sunrise occurs before the Morning period starts. In other words, when the Day period overlaps with the Morning period, the Day profile will override. The Night profile is applied when sunset occurs after the night period starts. In other words, when the Night period overlaps with the Evening period, the Night profile will override. These overrides ensure that the lights are off when the sun is up if the Day period is set to 0 Min and 0 Max.
Note: Few advanced options in the profile are automatically applied by default, so outdoor fixtures behave appropriately as the sun sets. See Setting Advanced Attributes when Astronomical Clock is Set article for details.