valonlähtein

Valonlähtein is a Finnish morphological form derived from valonlähde, meaning a light source. It designates the means by which something occurs, i.e., “by light sources” or “with light sources,” and is used primarily in formal, literary, or historical contexts. In everyday language, speakers typically use alternative constructions such as valonlähteiden avulla or käyttämällä valonlähteitä to express the instrumental meaning.

A valonlähde refers to any object or phenomenon that emits light, including natural sources (the sun, stars) and artificial sources (incandescent lamps, LEDs, fluorescent lamps, candles). Light sources are commonly discussed in terms of their properties for planning and analysis, such as luminous flux (brightness), luminous efficacy (efficiency), color temperature, color rendering, and expected lifetime. In engineering and design contexts, these characteristics influence the selection, placement, and control of illumination in spaces, products, and workflows.

Linguistically, valonlähtein illustrates how Finnish marks instrument or means in certain grammatical forms. While the instrumental plural form can appear in historical or literary texts, it is less common in contemporary technical or everyday Finnish. The term serves as a useful example for understanding Finnish case forms and stylistic variation.

See also: valonlähde, valaisinjärjestelmä, valaistus.