Valgustundliku

Valgustundliku is an Estonian adjective that translates to "light-sensitive" or "photosensitive" in English. It is used to describe objects, materials, or organisms that react to light.

In photography, valgustundliku refers to the sensitivity of a photographic film or sensor to light. A highly valgustundlik film requires less light to produce an image, allowing for shooting in darker conditions or at faster shutter speeds. Conversely, a less valgustundlik film needs more light. This property is often indicated by an ISO number.

In biology, valgustundliku can describe the response of plants to light, such as phototropism, where a plant bends towards a light source. It can also refer to the sensitivity of animal eyes or skin to light. Some animals are more valgustundlik than others, influencing their activity patterns, with nocturnal creatures often exhibiting higher light sensitivity.

Materials science also utilizes the term valgustundliku. Certain paints, dyes, or plastics can degrade or change color when exposed to sunlight over time, indicating their light sensitivity. This property is important in product design and material selection, especially for items intended for outdoor use. Understanding the valgustundliku nature of materials helps in predicting their longevity and performance under various environmental conditions.