lichtstark
lichtstark is a German word that translates to "light-strong" or "bright" in English. It is often used in photography to describe a lens that has a wide aperture. A wide aperture allows more light to enter the camera, which is beneficial in low-light conditions and for creating a shallow depth of field. In photography, aperture is measured in f-stops, and a smaller f-number indicates a wider aperture and thus a "lichtstark" lens. For example, an f/1.4 or f/2.8 lens would be considered lichtstark.
The term can also be used more broadly to describe anything that is intensely bright or luminous.