Natural daylight

natural daylight2

Daylight is more than light

The daylight we see might not be the daylight our body needs. When talking about daylight three items are important:

Our sense of vision used for visual information and providing us orientation;

The colour temperature  measured in Kelvin(K) influencing our psyche;

The full spectrum of daylight (from ultraviiolet to  nearly infrared) affecting  the human bioclock and immune system.

Special glazing (solar control, solar-films or electrochromic) change the spectral composition of the natural daylight while solar shading systems can reduce the quantity of daylight entering a room without changing its nature. This is due to the fact that shading reduces the energy transmittance keeping a part of direct light transmittance (through holes or slats for example). 

IUse 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

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