fotometrisilla

Fotometrisilla is a Finnish plural adessive form of the adjective fotometrinen, meaning photometric. It is used to describe nouns that pertain to photometry or to measurements and devices associated with measuring light as perceived by the human eye. The form appears in contexts such as instruments, methods, or datasets operated or produced with photometric principles.

In Finnish morphology, fotometrinen becomes fotometrinen (singular), fotometriset (nominative plural), and fotometrisilla in the plural adessive, used to indicate “on/with photometric ...” or “using photometric ...” For example, fotometrisilla laitteilla means with photometric instruments, and fotometrisilla mittauksilla means using photometric measurements. This construction is common in scientific Finnish when specifying the tools or techniques employed in an observation or experiment.

Usage notes: Fotometrisilla typically modifies plural nouns and often appears in technical or descriptive sentences, where a distinction is made between photometric methods and other approaches (for example radiometric or colorimetric methods). The adjective fotometrinen describes the property itself, while fotometria refers to the field of photometry, the science of measuring light. The adverbial form fotometrisesti describes performing actions photometrically.

Applications and relevance: Photometry plays a central role in astronomy, vision science, lighting design, and photography, where precise measurement of light intensity and luminous flux is essential. Photometrisilla instruments and methods enable standardized, human-eye–weighted assessments of brightness and illumination.

See also: fotometria, fotometrinen, fotometrisesti.