For the practitioners in the lighting industry, the concept of IES documents will not be unfamiliar. The IES file is the electronic format of the light source (light fixture) light distribution curve file, because its extension is "*.ies", so we usually call it IES file. The meaning of the IES file is custom-made by the North American Lighting Association and is now the default file format for storing spatial light intensity distribution in many regions.
First introduce IES.
IES
IES (North American Lighting Engineering Society) is the abbreviation of English Illuminating Engineering Society of North America.
Founded in 1906, IES is a technical society. The standardization work is responsible for more than 80 technical committees and sub-technical committees.
The technical committees are engaged in the research and development of various lighting equipment, and investigate and report to the directors on lighting issues in various fields. For example, airports and airplanes, farms, factories, research institutions, offices, public transport, homes, schools, service spaces, streets and roads, theaters and television stations.
Other topics include light sources, lighting, and air conditioning. IES also has partnerships with other professional organizations such as the International Commission on Illumination (ICI).
IES file
The IES file is the electronic format of the light source (light fixture) light distribution curve file, because its extension is "*.ies", so we usually call it IES file. The meaning of the IES file is custom-made by the North American Lighting Association and is now the default file format for storing spatial light intensity distribution in many regions.
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IES If you look at the thumbnails, what you see is its meridian surface light distribution curve, which is the polar coordinate curve. The following is a schematic diagram of Lisun's IES file. However, if you open it in the format of an ASCII text file (usually a notepad, with the extension "*.txt"), there is a fixed format for recording certain information.
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