Study of the Spectral Characteristics of LED Domestic Lamps During the Warm-Up Process

The paper presents results of measured spectral characteristics of contemporary LED domestic lamps with different colour characteristics during the warm-up process to steady state. The measurements of the spectral characteristics of LED lamps are performed using a CCD spectroradiometer with an integrating sphere system and thermal camera. The measured relative spectral distribution of radiant flux in a turning on and a steady state of the LED lamps is presented comparatively. Measured and calculated peak wavelength in the region of the blue LED radiation, the relative change of the correlated colour temperature and colour rendering index during warm-up to a steady state of the tested LED lamps are presented. Conclusions regarding the measured and calculated spectral indicators of the tested LED domestic lamps are made.