Final ReportSummary - COELUX (The sky light reconstruction in artificial illumination by means of solid transparent nanocomposites) The quality of artificial illumination is a major concern in developed and developing societies, where the structure of work areas, malls, community and sport centres, railway stations, airports, etc. forces a rapidly increasing fraction of the population to spend more and more of their time deprived of natural lighting. In many cases living space do not allow for the presence of windows or skylights, which would grant users the comfort deriving from visual contact with the external environment. When only artificial lighting is present, the space is felt as an isolated recess, disconnected from natural rhythms and unresponsive to the basic human demand of having a relationship to light which is more than just quantitative. The problem is particularly relevant for northern (or southern) regions, where natural illumination is lacking for a large part of the year. It is especially relevant also for those areas characterised by unfavourable climatic conditions, e.g. due to very high or low temperature, where the construction of underground living areas is becoming more and more frequent in order to fulfil energy-saving requirements. The situation is destined to become even more dramatic in the near future, and involves domestic lighting too, owing to the scheduled massive replacement of incandescent illumination by fluorescent-lamp or white-LED technologies. While these are indeed an improvement in terms of energy saving, they represent a loss in terms of personal comfort of the illumination, thus raising the problem to the level of health care. In a scenario where all scientific and industrial efforts are spent on developing low-consumption light sources with the same spectrum as that of the sun, COELUX demonstrates a ground-breaking solution, based on the evidence that the sun cannot provide natural light in the absence of sky. With the aim of producing those colour distributions captured by artists in their masterpieces, COELUX has developed innovative materials, incorporated them in lighting installations, and so recreated the same atmospheric effects that produce the all colour variety in transmitted sunlight, and the blue tinge in the shade under diffused sky light. In so doing, spectacular sky reproduction in noon or sunset modes, under a clean or stormy-day, are made available for apartments, working areas, malls, sport centres, railway stations, as well as for squares, parks, and stadiums, during night time. The technology is compatible with low-consumption fluorescent lamps or LEDs, being less demanding in terms of source quality.
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