Spectral Power Distribution
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...
KeywordsLight Source Optical Radiation Color Property Color Quality Solid State Lighting
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