valaisu
Valaisu is a Finnish noun referring to illumination or lighting. It denotes the act or state of lighting a space or subject, either with artificial light sources or by daylight. In contemporary Finnish, the more common word for lighting as a system is valaistus; for photographic exposure the related term is valotus. Valaisu may appear in older texts or in contexts where emphasis is on the visible lighting condition rather than the technical system.
Etymology: valaisu is built from valo 'light' plus the abstract suffix -aisu, forming a notion of a
In practice, valaisu encompasses planning and execution of lighting: the choice of light sources, their placement,
Common related terms include valaistus (lighting in a broader sense), valot (lights), valotustekniikka (exposure technology), and
Valaisu remains a descriptive term used in Finnish literature and design discourse, with its practical usage