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Open AccessArticle

An Efficient Method for LED Light Sources Characterization

Department of Information Engineering (DII), Università Politecnica delle Marche, 60131 Ancona, Italy
iGuzzini Illuminazione S.p.A, Via Mariano Guzzini 37, 62019 Recanati, Italy
Author to whom correspondence should be addressed.
Electronics 2019, 8(10), 1089;
Received: 29 August 2019 / Revised: 18 September 2019 / Accepted: 23 September 2019 / Published: 25 September 2019
(This article belongs to the Special Issue Latest Developments in LED Drivers)
Digital LED drivers capable of blending the spectrum of two LED fixtures with different Correlated Color Temperatures through the LEDs’ power supply control are widespread. However, the digital control of lighting systems is possible only after a careful study of the LED’s response, in terms of illuminance and Correlated Color Temperature. The proposed work takes advantage of the Tunable White technology for the realization of an efficient method for LED light source characterization. In order to evaluate how the light changes as a function of the electric power supplied by the LED drivers, an experimental setup to characterize LED light sources has been designed. Starting from the data acquired from the experimental setup, a model for dimming the LED driver and obtaining the desired values of quality of light has been developed. The proposed model is based on the least squares method and its accuracy is evaluated by comparing the obtained values of illuminance and Correlated Color Temperature with those measured by an illuminance spectrophotometer. Results achieved an error of 0.3% for Correlated Color Temperature and 1.5% for illuminance using the proposed approximation functions. View Full-Text
Keywords: LED light source characterization; digital LEDs control; smart lighting; tunable white technology LED light source characterization; digital LEDs control; smart lighting; tunable white technology
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Raggiunto, S.; Belli, A.; Palma, L.; Ceregioli, P.; Gattari, M.; Pierleoni, P. An Efficient Method for LED Light Sources Characterization. Electronics 2019, 8, 1089.

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