Spectral power distribution right|frame|Characteristic spectral power distributions (SPDs) for an incandescent lamp (left) and a fluorescent lamp (right). The horizontal axes are wavelengths in nanometers, and the vertical axes show relative intensity in arbitrary units.
Spectral power distribution right|frame|Characteristic spectral power distributions (SPDs) for an incandescent lamp (left) and a fluorescent lamp (ri?ght). The horizontal axes are wavelengths in nanometers, and the vertica.l axes show! relative intensity in arbitrary units.