This paper deals with the study of the pilot project of street lighting using LED luminaires on the campus of Federal University of Juiz de Fora. Over twenty nine months the system was monitored in order to evaluate the performance of this technology that is gaining ground in the lighting industry. Photometric and electrical results obtained during this period will be presented as well as a comparison with the old lighting system that employs high-pressure sodium lamps based on classical photometry and mesopic photometry, which takes into account the dynamic visual response of the human eye. In addition, will be done a simplified economic analysis aiming to show the saving generated by the new lighting system and a calculation of payback of the new luminaires.

This paper presents a discussion about the use of a low frequency Ćuk-based pre-regulator as an offline LED driver and its application to a street lighting LED luminaire. This AC-DC converter may provide high power factor, low input current distortion and compliance with IEC 61.000-3-2 Class C standard, which limits the emission of harmonic currents of lighting equipment. The analysis of the Ćuk pre-regulator is revised and a simplified method of microcontrolled control is proposed. Experimental results are shown to an LED luminaire which delivers around 80 W to the lighting devices. For the presented prototype, no electrolytic capacitors are required, which define an extended lifetime for this driver. Moreover, the proposed LED driver can make use of conventional choke inductors employed in nowadays HID-ballasts.

The human eye presents different visual responses for different luminosity conditions. Thus, it can be defined different regimes of operation of the human visual system, like photopic and scotopic regimes, for high and low luminance levels respectively. All the classic photometry is based on the vision sensibility under the photopic regime. However, in several situations, it is common to face intermediate conditions known as mesopic. So, in order to convert photometric quantities between photopic and mesopic regimes, there is an equation in literature that describes the relationship between photopic and scotopic luminous fluxes as a function of the color correlate temperature. However, there are some evidences that this expression does not apply accurately to all technologies of light sources. Thus, this paper presents laboratory data showing that the equation in question does not apply to all lighting technologies, pointing towards a review of that relationship.

Este artigo faz uma análise a respeito de como o avanço e disseminação da internet culminou em novos padrões de comportamento. Percebe-se que o desenvolvimento de novas tecnologias possibilita o surgimento de produtos com certo grau de inteligência que podem otimizar as tarefas diárias dos indivíduos. Por conseguinte, o novo conceito de smart home apresenta a possibilidade do uso mais eficiente de aparelhos domésticos para economia de energia, por meio de estratégias que colaboram para a eficiência energética sem grandes compromissos financeiros. O objetivo deste artigo é apresentar alguns dispositivos com foco nas smart home que possam ser adquiridos de forma acessível financeiramente, ou seja, com baixo custo e que não exijam um sistema de instalação complexo, como demais automações que elevam o custo final do produto. O trabalho partiu da pesquisa bibliográfica e documental com base nas seguintes temáticas: internet das coisas, smart home, eficiência energética e sistemas e dispositivos. Além disso, foi realizada uma busca mercadológica por tecnologias e produtos inteligentes comercializados no Brasil, com baixo custo e de fácil instalação. O principal resultado desta pesquisa expõe alguns dispositivos que podem auxiliar na redução do consumo de energia e que se apresentam acessíveis no mercado com valores variáveis de acordo com marca e modelo. Posto isso, nota-se a viabilidade de adotar novas estratégias nas residências brasileiras, a partir dos dispositivos mencionados para corroborar com políticas governamentais que incentivem a eficiência energética, com o intuito de fortalecer um dos objetivos do desenvolvimento sustentável da ONU, produção e consumo responsáveis.

The main purpose of this paper is to analyze the performance of LED luminaries and to analyze the remote management integrated into them. These luminaires come with a remote monitoring system based on ZigBee protocol, and it allows wireless communication using GSM / GPRS, the most used technology around the world provided by mobile network operators. With photometric tests, electrical and performance analysis of the luminaires in according to the standards, this paper aims to study the operation of the whole system in a pragmatic way and to evaluate the actual performance and the possible positive and desired results on the public lighting system.

This paper presents an offline LED driver based a low-frequency boost converter and its application to street lighting luminaires. The analysis of the boost pre-regulator is revised and two simplified methods of microcontrolled control are proposed. Experimental results are shown to an LED luminaire operating in 165W.