"Use of daylight is of great importance as it can lead to a significant reduction of energy demand caused by artificial lighting. At the same time, access to daylight in a living and working space contributes significantly to the well-being and health preservation of occupants." (Extract of findings in BPIE report 2015 on Indoor air quality, thermal comfort and daylight).
On the other hand, daylight has to be filtered to prevent anoying side effects such as glare.
During the day light levels vary significantly, as you can see in this video.
That is why we advise to use our Helioscreen fabrics on automated window blinds.