Blas Ogáyar-Fernández’s research while affiliated with University of Jaén and other places

Currently, LED technology is an established form of lighting in our cities and homes due to its lighting performance, durability, energy efficiency and light, together with the economic savings compared to discharge luminaires. However some problems associated with the large-scale replacement of incandescent lamps by LED luminaires have begun to be detected, which end up affecting on the circuit to which the luminaires are connected and on various components such as wiring and protections. These problems include the heating of conductors and the breakdown of overcurrent protections.The purpose of this paper is to study and compare the two key parameters in the above mentioned problems such as inrush current and harmonic generation in both street lighting luminaires. This two parameters will be studied and how they can be used to predict or estimate the wiring cross-section of the circuits or the number of adequate overcurrent protection mechanisms to be installed for proper replacement. KeywordsLEDDischargeInrush currentHarmonic generationElectrical consequences and urban lighting

Currently, LED technology is an established form of lighting in our cities and homes. Its lighting performance, durability, energy efficiency and light, together with the economic savings that its use implies, are displacing other classic forms of lighting. However, some problems associated with the durability of the equipment related to the problems of thermal dissipation and high temperature have begun to be detected, which end up affecting their luminous intensity and the useful life. There are many studies that show a direct relationship between the low quality of LED lighting and the aging of the equipment or its overheating, observing the depreciation of the intensity of the light and the visual chromaticity performance that can affect the health of users by altering circadian rhythms. On the other hand, the shortened useful life of the luminaires due to thermal stress has a direct impact on the LCA (Life Cycle Analysis) and its environmental impact, which indirectly affects human health. The purpose of this article is to compare the results previously obtained, at different contour temperatures, by theoretical thermal simulation of the 3D model of LED street lighting luminaires through the ANSYS Fluent simulation software. Contrasting these results with the practical results obtained with a thermal imaging camera, the study shows how the phenomenon of thermal dissipation plays a fundamental role in the lighting performance of LED technology. The parameter studied in this work is junction temperature (Tj), and how it can be used to predict the luminous properties in the design phase of luminaires in order to increase their useful life.