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A goniophotometer is a photometer for measuring the directional light distribution characteristics of light sources, luminaires, optical media, and surfaces
Goniophotometer
Visible light per unit solid angle
intensity of artificial light sources is typically measured using a goniophotometer outfitted with a photometer or a spectroradiometer. The symbols in
Luminous_intensity
Optical component
instrument in photometry and radiometry and has the advantage over a goniophotometer that the total power produced by a source can be obtained in a single
Integrating_sphere
Data file format
IESNA LM-63. The data in an EULUMDAT file is usually measured using a goniophotometer. The IES file format is more formally specified and many measuring
EULUMDAT
Perceived luminous power
light sources is typically measured using an integrating sphere, or a goniophotometer outfitted with a photometer or a spectroradiometer. The symbols in
Luminous_flux
High-intensity electric light with a broad beam
luminous intensity distribution of a floodlight (measured using a goniophotometer) is commonly described using the National Electrical Manufacturers
Floodlight
Measurement of visible light
lamp from all sides. Lamps and lighting fixtures are tested using goniophotometers and rotating mirror photometers, which keep the photocell stationary
Photometry_(optics)
wavelength-dependent, scattered from a surface. Goniophotometry involves the use of a goniophotometer to measure intensity distributions from lamps and luminaries and to
Goniophotometry
Angle measuring instrument
into the atomic structure of crystals in 1912 involved a goniometer. Goniophotometers measure the spatial distribution of light visible to the human eye
Goniometer
Width of the beam of light emitted by a light
distribution data used to determine beam angle is typically measured using a goniophotometer. The International Commission on Illumination (CIE) uses centre beam
Beam_angle
represent the light source as a point. Typically measured using a goniophotometer. Radiant intensity distribution — captures radiant intensity data in
List of file formats for luminaire radiometric data
List_of_file_formats_for_luminaire_radiometric_data
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