Abstract
The interrelation between colorimetric (correlated color temperature) and spectral (intensity ratio of spectral emission bands) parameters of white LED lamps for general lighting has been established based on an analysis of test results for a set of lamps during aging. Deconvolution of the lamp radiation spectra is used to show that the change in color temperature is mainly due to a change in the intensity ratio of the 450-nm band originating from the diode heterostructure and the long-wavelength component of the nonelementary yellow band of the phosphor radiation with a maximum at 580 nm. However, the shorter-wavelength component with a maximum of 530 nm manifests itself mainly in the change of the total luminous flux. A possible cause of the change in the intensity of the spectral components of the nonelementary phosphor radiation band may be both thermal effects and structural changes in the phosphor material.
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