thumb|right|Manual (1), and Eilhard Mitscherlich|Mitscherlich's optical (2) goniometers for use in crystallography, c. 1900 A goniophotometer is a photometer for measuring the directional light distribution characteristics of light sources, luminaires, optical media, and surfaces. A goniophotometer typically incorporates a goniometer that measures direction using spherical coordinates to capture the angular distribution of the transmitted, emitted, or reflected light. A gonioradiometer differs only in that it is a radiometer (i.e., is not specific to human vision), rather than a photometer.
thumb|right|Manual (1), and Eilhard Mitscherlich|Mitscherlich's optical (2) goniometers for use in crystallography, c. 1900 A goniophotometer is a photometer for measuring the directional light distribution characteristics of light sources, luminaires, optical media, and surfaces. A goniophotometer typically incorporates a goniometer that measures direction using spherical coordinates to capture the angular distribution of the transmitted, emitted, or reflected light. A gonioradiometer differs only in that it is a radiometer (i.e., is not specific to human vision), rather than a photometer.
The directional distribution of light is of high importance to architectural lighting, automotive lighting, and other applications. A goniophotometer enables characterization of emitted light that is not isotropic.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).