EULUMDAT is a data

file format A file format is a standard way that information is encoded for storage in a computer file. It specifies how bits are used to encode information in a digital storage medium. File formats may be either proprietary or free. Some file formats ...

used for specification of photometric data especially

intensity Intensity may refer to: In colloquial use *Strength (disambiguation) *Amplitude * Level (disambiguation) * Magnitude (disambiguation) In physical sciences Physics *Intensity (physics), power per unit area (W/m2) *Field strength of electric, ma ...

distributions from light sources such as lamps and luminaries. The file extension is .ldt. The format was proposed by Axel Stockmar (Light Consult Inc., Berlin) in 1990. The format is the European equivalent to the

IES The initialism IES may refer to: Government organizations * Indian Economic Service * Indian Education Service, in British India * Institute for Environment and Sustainability of the European Commission * Institute of Education Sciences of the U.S ...

file format specified in IESNA LM-63. The data in an EULUMDAT file is usually measured using a

goniophotometer A Goniophotometer is a device used for measurement of the light emitted from an object at different angles. The use of goniophotometers has been increasing in recent years with the introduction of LED-light sources, which are mostly directed light ...

. The IES file format is more formally specified and many measuring instruments support both formats of file.

External links

Definition for the EULUMDAT format
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References

Lighting Computer file formats Photometry {{Compu-stub