Encyclopedia of Color Science and Technology

Living Edition
| Editors: Ronnier Luo

Spectral Power Distribution

Living reference work entry
DOI: https://doi.org/10.1007/978-3-642-27851-8_352-1

Synonyms

Definition

Spectral power distribution (SPD) is a function of wavelength and describes the amount of optical radiation across part of a spectrum. SPD usually describes optical radiation emitted by a light source, but generally, SPD can be applied to describe optical radiation reflected by an object, or transmitted from a transparent/semi-transparent object.

According to the definition of the Illuminating Engineering Society of North America (IESNA), SPD is “a pictorial representation of the radiant power emitted by a light source at each wavelength or band of wavelengths in the visible region of the electromagnetic spectrum.” Ideally, SPD should be expressed in units of W/nm. However, in some of the literature, SPD is a general term used to describe any radiometric or photometric quantity as a function of wavelength (with corresponding units). In many conventional cases, SPD is referred to as radiant power per unit area as a function of...

Keywords

Light Source Optical Radiation Color Property Color Quality Solid State Lighting 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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References

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Center for Measurement StandardsIndustrial Technology Research InstituteHsinchuTaiwan