päivänvalofaktorin

Päivänvalofaktori, often translated as daylight factor, is a concept used in building design and lighting engineering to assess the amount of natural daylight reaching an interior space. It is defined as the ratio of the illuminance at a specific point indoors to the illuminance on a horizontal plane under an unobstructed overcast sky. This ratio is expressed as a percentage.

The daylight factor takes into account various factors that influence daylight penetration, including the size and placement of windows, the reflectance of interior surfaces, and the presence of any external obstructions like surrounding buildings or trees. A higher daylight factor indicates a greater contribution of natural light to the space, which can lead to reduced reliance on artificial lighting, energy savings, and improved occupant comfort and well-being.

Calculating the daylight factor is typically done using specialized software or by employing simplified analytical methods. It is a crucial metric for architects and lighting designers aiming to optimize daylighting strategies in buildings, particularly in workspaces, schools, and residential areas where good natural light is desired. The target daylight factor for a particular space can vary depending on its intended use and local building codes or guidelines. Understanding and applying the daylight factor helps in creating more sustainable and human-centered built environments.