ICIT - IEEE 2018

From 02/19/2018 to 02/22/2018

Centre de Congrès - Cité Internationale Lyon - 50, quai Charles de Gaulle 69463 Lyon

Tutorial 7 Pr Georges ZISSIS

Title: Evolutions in the Lighting Systems’ Technology and impacts on energy, environment and human beings

Artificial lighting has become an essential element of today’s society for esthetics, comfort or security reasons. Reducing the man’s environmental impact on the planet is one of the most important challenges of our century. For many sectors, it concerns the global scale such as the depletion of energy resources and climate change but also the local scale with the use of chemicals. Lighting is directly concerned: there are around 30 billion light artificial sources around the world consuming 3140 TWh of electricity per annum, equivalent to 19% of the total world consumption. Solid State Lighting (SSL) is currently revolutionizing the field of lighting and its applications. In the long term, inorganic and organic light emitting diodes (LEDs) will become the most widely used light sources. White LEDs have shown a steady growth of their luminous efficacy for more than fifteen years; promising to make significant energy savings as they replace older lighting technologies. Phosphor-converted white LEDs (pcWLED) are now widely used in general lighting. Although LED technology is now matured, the luminous efficiency of the light sources together with their quality of light have not quite reached their limits: there is still room for innovation. There are still many opportunities for enhancing not only the efficiency and reliability of lighting systems but also improving the quality of light as seen by the end user. In addition, smart-lighting and “human-centric” technologies are knocking on the door. What will be their real impacts in all the abovementioned domains? A real energy efficiency of lighting system is capital during the “use-phase” in order to limit environmental impact. And what about the others stages of life cycle such as manufacturing step also requires resources, recycle or waste disposal? Considering the totality of life cycle, what is most efficient lighting system? To take into account environmental impact of lighting system throughout their life cycle, a scientific and standardized method was developed with a holistic approach: The Life Cycle Analysis (LCA). Furthermore, due to specific spectral characteristics of white light emitting diodes (LEDs), as compared to other artificial sources, some concerns have been raised regarding safety. SSL products should be proven to be at least as safe as the products they intend to replace, and new or unusual conditions of usage should be considered. In fact, in order to achieve considerable savings from lighting, a coherent strategy is required to transform the lighting market in both International and National levels. Today, technical criteria must be considered in the context of a broader technico-financial analysis that also takes into account the economic performance, the maintenance constraints, the environmental impact and the competitiveness of the commercial proposal – which can be used to judge the suitability of the choice of given technology in comparison with conventional solutions. The tutorial emphasises the importance of taking a holistic view in the development of lighting systems in order to obtain high quality lighting that is need for ensuring quality of life, health and security of end-users. What are the challenges and also the limitations of new technologies? What is the impact on the environment, health and security? All these will be discussed during the tutorial without omitting the lighting basics and technology highlights.