With the Day Temperature slider you can set the Color Temperature during the day.
Iris detects if it’s day or night based on the clock and location.
If you don’t see change when you move this slider make sure that Manual color settings is set to OFF and it’s day.
The values are based on K (Kelvins) which is the standard measure for Color Temperature.
The lower the value the less blue light, the higher the value the more blue light is emitted from the screen.