Evaluation of Radiometric Performances for SMD LEDs under different injection powers supply

This work reports a characterization study of the light properties of SMD LED luminaire, emitting white light, under different operating conditions. Indeed, we carried out an experimental study using a spectrometry technique composed of an integrating sphere connected to the spectrometer by an optical fiber. Thus, the correlated color temperature, the color rendering index and the chromaticity coordinates of multichip LEDs luminaire were measured for different power supplies. In addition, the evolution of mentioned parameters over time during 180 min of LEDs' operation under the same power supply was pursued to verify their time stability. This allows us to highlight the effect of the current injected into the LEDs luminaire in relation to its radiometric performances.