valaistusmäärä
Valaistusmäärä, commonly referred to in lighting practice as illuminance, describes the amount of light incident on a surface. It is a measure of how brightly a space appears to the human eye and is a central parameter in lighting design and evaluation. In practical terms, it indicates whether a surface receives enough light to perform tasks comfortably and safely.
Illuminance is quantified in lux (lx), where 1 lux equals 1 lumen per square meter. It is
Standards and guidance: Illuminance levels are specified for different tasks and environments in international and national
Related concepts: Valaistusmäärä complements related quantities such as luminous flux (valovirta) and luminance, and it must