lichtdurchlässigen

Lichtdurchlässigen is the attributive form of the German adjective lichtdurchlässig. It describes materials or substances that permit the passage of light, but not necessarily with complete clarity. The term sits between transparent (durchsichtig) and opaque (undurchsichtig) and is commonly used when light is transmitted to some degree, often with diffusion that reduces sharp visibility of objects behind the material. In everyday language, it can refer to glass, films, fabrics and plastics that are not fully opaque.

Lichtdurchlässigkeit is usually described by the transmittance, or Transmissionsgrad, which is the fraction of incident light that passes through the material. This value is typically given as a percentage. A higher transmittance indicates more light passes through and a clearer impression, while a lower value means stronger attenuation of light. Many lichtdurchlässige materials also diffuse light, so that while the interior remains lit, you cannot see clearly through the material.

In practice, the term is widely used in architecture, interior design and materials science. Examples include lichtdurchlässige Vorhänge, translucent curtains; lichtdurchlässige Fensterfolien, which modify light transmission while preserving visibility; and various textiles and plastics designed to admit light while maintaining privacy or shading. The concept is important for considerations such as daylighting, energy efficiency and visual comfort in built environments.